I am binding image to datalist.
My imagename is in database, i am taking it and wants to bind it to datalist.
I have tried following:
<asp:DataList ID="dlImages" runat="server">
<ItemTemplate>
<asp:ImageButton ID="ImageButton1" Height="200px" Width="200px"
ImageUrl='<%# Bind ("PageName","D:\Sagar\Kinston\WebSite\ScreenMasterImages\{0}") %>' runat="server" />
</ItemTemplate>
</asp:DataList>
on pageload i have bounded it as:
ds = gc.GetDataToListBinder("select DISTINCT PageOrderID,PageName from ScreenMaster order by PageOrderID")
dlImages.DataSource = ds.Tables(0)
dlImages.DataBind()
In above code ds is my dataset and gc.GetDataToListBinder(query) returns dataset.
But images are not getting displayed.
What can be the mistake?
EDIT1:
<asp:ImageButton ID="ImageButton1" Height="200px" Width="200px" ImageUrl='<%#Server.HtmlDecode(Eval("PageName","D:\Sagar\Kinston\WebSite\ScreenMasterImages\{0}.jpg")) %>' runat="server" />
Take a minute and read this:
http://www.codeproject.com/Articles/142013/There-is-something-about-Paths-for-Asp-net-beginne
I think this will help you alot.
EDIT:
For the space problem, take a look:
Why does HttpUtility.UrlEncode(HttpUtility.UrlDecode("%20")) return + instead of %20?
Basically:
ImageUrl='<%# Server.HtmlDecode(Bind("MyImage")) %>'
But i recommend that you store your image name without space in db.
EDIT2:
ImageUrl='<%# Eval("MyImage") %>'
ImageUrl='<%# Server.HtmlDecode(Eval("MyImage")) %>'
<asp:DataList ID="DataList1" runat="server" RepeatColumns="3"
RepeatDirection="Horizontal" CellPadding="2"
CellSpacing="2"
UseAccessibleHeader="True" >
<ItemTemplate>
<asp:ImageButton Width="120" Height="120" ID="Image1" ImageUrl='<%# Eval("Imgpath", "") %>' runat="server" />
</asp:Datalist>
.CS
SqlConnection con;
SqlCommand cmd;
string strCon = "Connection String";
SqlDataAdapter da;
protected void AlldataImg()
{
DataTable dt = new DataTable();
string strQuery = "select code,imgpath from SA_Stock order by Code";
cmd = new SqlCommand(strQuery);
con = new SqlConnection(strCon);
da = new SqlDataAdapter();
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
try
{
con.Open();
da.SelectCommand = cmd;
da.Fill(dt);
DataList1.DataSource = dt;
DataList1.DataBind();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
finally
{
con.Close();
da.Dispose();
con.Dispose();
}
}
protected void Page_Load(object sender, EventArgs e)
{
AlldataImg();
}
Put Image Path in database too so that image will appear..
protected void DataListPosts_ItemDataBound(object sender, DataListItemEventArgs e)
{
try
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataRowView dr = (DataRowView)e.Item.DataItem;
Image ImageData = (Image)e.Item.FindControl("ImageData");
if (dr.Row[4].ToString() != "NA")
{
ImageData.Visible = true;
ImageData.ImageUrl = #"ImgPost/" + dr.Row["ImgPath"].ToString();
}
else
ImageData.Visible = false;
}
}
catch (Exception)
{ }
}
its a old topic but i think it can be usefull for anyone
firstly get your data from string
string sqlget = "select Photo from Promoter";
and get it to database dsget
then do that
dsget.Tables[0].Columns.Add("Photopath", typeof(string));
for (int i = 0; i < dsget.Tables[0].Rows.Count; i++)
{
if (dsget.Tables[0].Rows[i]["Photo"].ToString() != null && dsget.Tables[0].Rows[i]["Photo"].ToString() != "")
{
var data = (Byte[])(dsget.Tables[0].Rows[i]["Photo"]);
var stream = new MemoryStream(data);
System.IO.BinaryReader br = new System.IO.BinaryReader(stream);
FileBytes = br.ReadBytes((Int32)stream.Length);
string base64String = Convert.ToBase64String(FileBytes, 0, FileBytes.Length);
dsget.Tables[0].Rows[i]["Photopath"] = "data:image/png;base64," + base64String;
}
}
DataList1.DataSource = dsget.Tables[0];
DataList1.DataBind();
in asp file write the following thing
Related
I have problem with files. I'm trying to download files from databases
through gridview, but after I download them, they are with wrong name and extensions. Their name are my web form name and their extensions are .aspx.
In the database they are saved in the correct format.
Here are my code-behind
public partial class data : System.Web.UI.Page
{
string cs = ConfigurationManager.ConnectionStrings["DecumentsConnectionString"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
FillData();
}
}
private void FillData()
{
DataTable dt = new DataTable();
using (SqlConnection cn = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand("getDecuments", cn);
cmd.CommandType = CommandType.StoredProcedure;
cn.Open();
SqlDataReader reader = cmd.ExecuteReader();
dt.Load(reader);
if (dt.Rows.Count > 0)
{
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
FileInfo filename = new FileInfo(FileUpload1.FileName);
byte[] documentContent = FileUpload1.FileBytes;
string name = filename.Name;
string extnt = filename.Extension;
using (SqlConnection con = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand("savedocument", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#name", name);
cmd.Parameters.AddWithValue("#Content", documentContent);
cmd.Parameters.AddWithValue("#extn",extnt);
con.Open();
cmd.ExecuteNonQuery();
}
}
private void Donwload(int id)
{
DataTable dt = new DataTable();
using (SqlConnection cn = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand("getdocument", cn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#ID", id);
cn.Open();
SqlDataReader reader = cmd.ExecuteReader();
dt.Load(reader);
}
string name = dt.Rows[0]["name"].ToString();
byte[] document = (byte[])dt.Rows[0]["DocumentContent"];
Response.ClearContent();
Response.ContentType = "application/octetstream";
Response.AddHeader("Content-Dispisition", string.Format("attachment;filename={0}", name));
Response.AddHeader("Content-Lenght", document.Length.ToString());
Response.BinaryWrite(document);
Response.Flush();
Response.Close();
}
protected void OpenDocument(object sender, EventArgs e)
{
LinkButton lnk = (LinkButton)sender;
GridViewRow gr = (GridViewRow)lnk.NamingContainer;
int id = int.Parse(GridView1.DataKeys[gr.RowIndex].Value.ToString());
Donwload(id);
}
}
}
and my html
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text="Document"></asp:Label>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Save" OnClick="Button1_Click" />
<br />
</td>
</tr>
</table>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
<Columns>
<asp:TemplateField HeaderText="Documents">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" OnClick="OpenDocument" runat="server" Text='<%# Eval("name") %>'></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
</div>
</form>
img
How can I make a grid like in Excel in ASP.NET WebForms?
I would like rows and columns where user can enter data and after a click on a save button the data would be inserted into a database.
Hope this will help you out to full-fill your requirement.Here I am giving only aspx and c# coding. Create and modify your database and change the code accordingly.Here I am using direct insert statement you can use stored procedure.
Table in Database:-
page.aspx :-
<asp:GridView ID="excelgrd" runat="server" AutoGenerateColumns="false" ShowFooter="true">
<Columns>
<asp:BoundField DataField="Slno" HeaderText="SL No" />
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:TextBox ID="txnm" runat="server"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:TextBox ID="txdesc" runat="server"></asp:TextBox>
</ItemTemplate>
<FooterStyle HorizontalAlign="Right" />
<FooterTemplate>
<asp:Button ID="ButtonAdd" runat="server" Text="Add New Row" OnClick="ButtonAdd_Click" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="svbtn" runat="server" Text="Save" OnClick="svbtn_Click" />`
code behind of your page :-
`
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["DBCS"].ToString());
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
bindgrd();//bind your grid
}
}
private void bindgrd()
{
DataTable dt = new DataTable();
DataRow dr = null;
dt.Columns.Add(new DataColumn("Slno", typeof(string)));
dt.Columns.Add(new DataColumn("Name", typeof(string)));
dt.Columns.Add(new DataColumn("Desc", typeof(string)));
dr = dt.NewRow();
dr["Slno"] = 1;
dr["Name"] = string.Empty;
dr["Desc"] = string.Empty;
dt.Rows.Add(dr);
//Store the DataTable in ViewState
ViewState["CurrentTable"] = dt;
excelgrd.DataSource = dt;
excelgrd.DataBind();
}
protected void addnewrow()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
//extract the TextBox values
TextBox tx1 = (TextBox)excelgrd.Rows[rowIndex].Cells[1].FindControl("txnm");
TextBox tx2 = (TextBox)excelgrd.Rows[rowIndex].Cells[2].FindControl("txdesc");
drCurrentRow = dtCurrentTable.NewRow();
drCurrentRow["Slno"] = i + 1;
dtCurrentTable.Rows[i - 1]["Name"] = tx1.Text;
dtCurrentTable.Rows[i - 1]["Desc"] = tx2.Text;
rowIndex++;
}
dtCurrentTable.Rows.Add(drCurrentRow);
ViewState["CurrentTable"] = dtCurrentTable;
excelgrd.DataSource = dtCurrentTable;
excelgrd.DataBind();
}
}
else
{
Response.Write("ViewState is null");
}
//Set Previous Data on Postbacks
SetPreviousData();
}
private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
TextBox tx1 = (TextBox)excelgrd.Rows[rowIndex].Cells[1].FindControl("txnm");
TextBox tx2 = (TextBox)excelgrd.Rows[rowIndex].Cells[2].FindControl("txdesc");
tx1.Text = dt.Rows[i]["Name"].ToString();
tx2.Text = dt.Rows[i]["Desc"].ToString();
rowIndex++;
}
}
}
}
protected void svbtn_Click(object sender, EventArgs e)
{
foreach(GridViewRow r in excelgrd.Rows)
{
string des =(r.FindControl("txdesc") as TextBox).Text;
string nm = (r.FindControl("txnm") as TextBox).Text;
try
{
con.Open();
SqlCommand sql = new SqlCommand("insert into test (name,name_desc) values('"+nm+"','"+des+"')", con);
sql.ExecuteNonQuery();
sql.Dispose();
}
catch (Exception e1)
{
string error = e1.ToString();
}
finally
{
con.Close();
}
}
}
protected void ButtonAdd_Click(object sender, EventArgs e)
{
addnewrow();
}`
I am trying to populate a gridview from a datatable in the code behind. In one of the columns dynamic checkboxes are generated. This is the code for gridview:
<asp:GridView ID="grdAdDetails" AutoGenerateColumns="False" runat="server">
<Columns>
<asp:BoundField HeaderText="Ad Id" DataField="Ad Id" Visible="false"></asp:BoundField>
<asp:BoundField HeaderText="Ad Type" DataField="Ad Type" />
<asp:TemplateField HeaderText="Ad">
<ItemTemplate>
<img src='<%#Eval("Ad") %>' height="150px" width="150px" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Ad Url" DataField="Ad Url" />
<asp:TemplateField HeaderText="Active">
<ItemTemplate>
**<asp:CheckBox ID="chkAds" Checked='<%#((bool)Eval("Active"))%>' runat="server" OnCheckedChanged="chkAds_OnCheckedChanged" />**
</ItemTemplate>
</asp:TemplateField>
<%--<asp:BoundField HeaderText="Active" DataField="Active" />--%>
<asp:BoundField HeaderText="Node Id" DataField="Node Id" />
</Columns>
</asp:GridView>
and this is the datatable code from the code behind:
DataTable dt = new DataTable();
dt.Columns.Add("Ad Id", typeof(string));
dt.Columns.Add("Ad Type", typeof(string));
dt.Columns.Add("Ad", typeof(string));
dt.Columns.Add("Ad Url", typeof(string));
dt.Columns.Add("Active", typeof(bool));
dt.Columns.Add("Node Id", typeof(string));
DataRow dr = dt.NewRow();
con.Open();
SqlCommand cmd = new SqlCommand("[temp].[somename]", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#nodeId", 1088);
cmd.Parameters.AddWithValue("#adType", 0);
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
dr["Ad Id"] = reader[0].ToString();
dr["Ad Type"] = reader[1].ToString();
dr["Ad"] = reader[2].ToString();
dr["Ad Url"] = reader[3].ToString();
dr["Active"] =Convert.ToBoolean(reader[4]);
dr["Node Id"] = reader[5].ToString();
}
dt.Rows.Add(dr);
}
con.Close();
grdAdDetails.DataSource = dt;
grdAdDetails.DataBind();
checkbox onchanged code:
public void chkAds_OnCheckedChanged(object sender, EventArgs e)
{
int selRowIndex = ((GridViewRow)(((CheckBox)sender).Parent.Parent)).RowIndex;
CheckBox cb = (CheckBox)grdAdDetails.Rows[selRowIndex].FindControl("chkAds");
if (cb.Checked)
{
//some code here
}
}
When I check/uncheck the checkbox, the OnCheckedChanged event is not firing. Can anyone help with that?
I have added a sample here plz chk it.
view:
<asp:GridView ID="GridView1" runat="server" DataKeyNames="ID" AutoGenerateColumns="false"
OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowDeleting="GridView1_RowDeleting"
OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:checkbox id="CheckBox1" runat="server" AutoPostBack="true" oncheckedchanged="CheckBox1_CheckedChanged" />
</ItemTemplate>
<EditItemTemplate>
<asp:FileUpload ID="FileUpload2" runat="server" />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="File Name">
<ItemTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl='<%#Eval("fpath")%>' />
</ItemTemplate>
<EditItemTemplate>
<asp:FileUpload ID="FileUpload2" runat="server" />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<%#Eval("desc1")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtdesc" runat="server" Text='<%#Eval("desc1")%>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:CommandField HeaderText="Modify" ShowEditButton="true" EditText="Edit">
<ControlStyle Width="50" />
</asp:CommandField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:LinkButton ID="lnkDelete" CommandName="Delete" runat="server" OnClientClick="return confirm('Are you sure you want to delete this record?');">Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
C#
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
SqlConnection sqlcon = new SqlConnection(ConfigurationManager.ConnectionStrings["Con"].ConnectionString);
SqlCommand sqlcmd = new SqlCommand();
SqlDataAdapter da = new SqlDataAdapter();
DataTable dt = new DataTable();
String fname, fpath, desc;
String spath;
protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = "";
if (!Page.IsPostBack)
{
LoadGrid();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
//Check File is available in Fileupload control and then upload to server path
fname = FileUpload1.FileName;
spath = #"~\Uploaded\" + FileUpload1.FileName;
fpath = Server.MapPath("Uploaded");
fpath = fpath + #"\" + FileUpload1.FileName;
desc = TextBox2.Text;
if (System.IO.File.Exists(fpath))
{
Label1.Text = "File Name already exists!";
return;
}
else
{
FileUpload1.SaveAs(fpath);
}
//Store details in the SQL Server table
StoreDetails();
TextBox2.Text = "";
LoadGrid();
}
else
{
Label1.Text = "Please select file!";
}
}
void StoreDetails()
{
String query;
query = "insert into fileDet(fname,fpath,desc1) values('" + fname + "','" + spath + "','" + desc + "')";
sqlcon.Open();
sqlcmd = new SqlCommand(query, sqlcon);
sqlcmd.CommandType = CommandType.Text;
sqlcmd.ExecuteNonQuery();
sqlcon.Close();
LoadGrid();
}
void LoadGrid()
{
sqlcon.Open();
sqlcmd = new SqlCommand("select * from fileDet", sqlcon);
da = new SqlDataAdapter(sqlcmd);
dt.Clear();
da.Fill(dt);
if (dt.Rows.Count > 0)
{
GridView1.DataSource = dt;
GridView1.DataBind();
}
else
{
GridView1.DataBind();
}
sqlcon.Close();
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
LoadGrid();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
LoadGrid();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
String ID;
ID = GridView1.DataKeys[e.RowIndex].Value.ToString();
sqlcmd = new SqlCommand("select * from fileDet where ID='" + ID + "'", sqlcon);
sqlcon.Open();
da = new SqlDataAdapter(sqlcmd);
da.Fill(dt);
if (dt.Rows.Count > 0)
{
if (System.IO.File.Exists(Server.MapPath(dt.Rows[0][2].ToString())))
{
System.IO.File.Delete(Server.MapPath(dt.Rows[0][2].ToString()));
}
}
sqlcmd = new SqlCommand("delete from fileDet where ID='" + ID + "'", sqlcon);
sqlcmd.ExecuteNonQuery();
sqlcon.Close();
LoadGrid();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = GridView1.Rows[e.RowIndex];
string ID;
ID = GridView1.DataKeys[e.RowIndex].Value.ToString();
FileUpload flname = (FileUpload)row.FindControl("FileUpload2");
if (flname.HasFile)
{
fname = flname.FileName;
spath = #"~\Uploaded\" + flname.FileName;
fpath = Server.MapPath("Uploaded");
fpath = fpath + #"\" + flname.FileName;
if (System.IO.File.Exists(fpath))
{
Label1.Text = "File Name already exists!";
return;
}
else
{
flname.SaveAs(fpath);
}
}
else
{
Label1.Text = "Please select file!";
}
TextBox desc1 = (TextBox)row.FindControl("txtdesc");
string query;
query = "update fileDet set fname='" + fname + "',fpath='" + spath + "',desc1='" + desc1.Text + "' where ID='" + ID + "'";
sqlcon.Open();
sqlcmd = new SqlCommand(query, sqlcon);
sqlcmd.CommandType = CommandType.Text;
sqlcmd.ExecuteNonQuery();
sqlcon.Close();
GridView1.EditIndex = -1;
LoadGrid();
}
protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
GridViewRow gr = (GridViewRow)chk.Parent.Parent;
// lblmsg.Text = GridView1.DataKeys[gr.RowIndex].Value.ToString();
//lblmsg.Text = "Hello";
}
}
I am trying to move the specific gridview data into the excel file but I am getting an error as object reference not set to the instance of an object
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "false" Font-Names = "Arial"
Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B"
HeaderStyle-BackColor = "green">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="Chckcol0" runat="server" Checked="true"/>
<asp:Label ID="lbl_catid" runat="server" Text=" CategoryID"></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lbl_catid" runat="server" Text='<%# Eval("cat_id")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="Chckcol1" runat="server" Checked="true"/>
<asp:Label ID="lbl_catname" runat="server" Text="category Name"></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lbl_categoryname" runat="server" Text='<%# Eval("categoryname")%>'> </asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<HeaderTemplate>
<asp:CheckBox ID="Chckcol2" runat="server" Checked="true"/>
<asp:Label ID="description" runat="server" Text="description"></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:Label ID="lbl_description" runat="server" Text='<%# Eval("description")%>'> </asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And my code behind:
public partial class _Default : System.Web.UI.Page
{
MySqlConnection con = new MySqlConnection("Data Source=localhost;Database=mylibrary_db;User ID=root;Password=MyLuck2010");
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
fillgrid();
}
}
protected void fillgrid()
{
MySqlDataAdapter da = new MySqlDataAdapter("select cat_id,categoryname,description from library_category", con);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
protected void getcheckedgridview()
{
CheckBox chkCol0 = (CheckBox)GridView1.HeaderRow.Cells[0].FindControl("chkCol0");
CheckBox chkCol1 = (CheckBox)GridView1.HeaderRow.Cells[0].FindControl("chkCol1");
CheckBox chkCol2 = (CheckBox)GridView1.HeaderRow.Cells[0].FindControl("chkCol2");
ArrayList arr;
if (ViewState["States"] == null)
{
arr = new ArrayList();
}
else
{
arr = (ArrayList)ViewState["States"];
}
arr.Add(chkCol0.Checked);
arr.Add(chkCol1.Checked);
arr.Add(chkCol2.Checked);
ViewState["States"] = arr;
}
protected void btnExportExcel_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition","attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.HeaderRow.Style.Add("background-color", "#FFFFFF");
GridView1.HeaderRow.Cells[0].Style.Add("background-color", "green");
GridView1.HeaderRow.Cells[1].Style.Add("background-color", "green");
GridView1.HeaderRow.Cells[2].Style.Add("background-color", "green");
ArrayList arr = (ArrayList)ViewState["States"];
GridView1.HeaderRow.Cells[0].Visible = Convert.ToBoolean(arr[0]);
GridView1.HeaderRow.Cells[1].Visible = Convert.ToBoolean(arr[1]);
GridView1.HeaderRow.Cells[2].Visible = Convert.ToBoolean(arr[2]);
GridView1.HeaderRow.Cells[0].FindControl("chkCol0").Visible = false;
GridView1.HeaderRow.Cells[1].FindControl("chkCol1").Visible = false;
GridView1.HeaderRow.Cells[2].FindControl("chkCol2").Visible = false;
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
row.Cells[0].Visible = Convert.ToBoolean(arr[0]);
row.Cells[1].Visible = Convert.ToBoolean(arr[1]);
row.Cells[2].Visible = Convert.ToBoolean(arr[2]);
row.BackColor = System.Drawing.Color.White;
row.Attributes.Add("class", "textmode");
if (i % 2 != 0)
{
row.Cells[0].Style.Add("background-color", "#C2D69B");
row.Cells[1].Style.Add("background-color", "#C2D69B");
row.Cells[2].Style.Add("background-color", "#C2D69B");
}
}
GridView1.RenderControl(hw);
string style = #"<style> .textmode { mso-number-format:\#; } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.End();
}
}
The fault is most likely to be with the Convert.ToBoolean(arr[0]); (see the line GridView1.HeaderRow.Cells[0].Visible = Convert.ToBoolean(arr[0]);)
I would put a break tag on the faulting line and see what the value of arr[0] is. I would guess arr is empty or null and your ViewState is not returning the data you are expecting. This maybe because your method getcheckedgridview() is not called by your code (or at least, not by the code you've displayed)!
You could try (where the only change is the first line of the method)
protected void btnExportExcel_Click(object sender, EventArgs e)
{
getcheckedgridview();//Only change to your code
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition","attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.HeaderRow.Style.Add("background-color", "#FFFFFF");
GridView1.HeaderRow.Cells[0].Style.Add("background-color", "green");
GridView1.HeaderRow.Cells[1].Style.Add("background-color", "green");
GridView1.HeaderRow.Cells[2].Style.Add("background-color", "green");
ArrayList arr = (ArrayList)ViewState["States"];
GridView1.HeaderRow.Cells[0].Visible = Convert.ToBoolean(arr[0]);
GridView1.HeaderRow.Cells[1].Visible = Convert.ToBoolean(arr[1]);
GridView1.HeaderRow.Cells[2].Visible = Convert.ToBoolean(arr[2]);
GridView1.HeaderRow.Cells[0].FindControl("chkCol0").Visible = false;
GridView1.HeaderRow.Cells[1].FindControl("chkCol1").Visible = false;
GridView1.HeaderRow.Cells[2].FindControl("chkCol2").Visible = false;
for (int i = 0; i < GridView1.Rows.Count; i++)
{
GridViewRow row = GridView1.Rows[i];
row.Cells[0].Visible = Convert.ToBoolean(arr[0]);
row.Cells[1].Visible = Convert.ToBoolean(arr[1]);
row.Cells[2].Visible = Convert.ToBoolean(arr[2]);
row.BackColor = System.Drawing.Color.White;
row.Attributes.Add("class", "textmode");
if (i % 2 != 0)
{
row.Cells[0].Style.Add("background-color", "#C2D69B");
row.Cells[1].Style.Add("background-color", "#C2D69B");
row.Cells[2].Style.Add("background-color", "#C2D69B");
}
}
GridView1.RenderControl(hw);
string style = #"<style> .textmode { mso-number-format:\#; } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.End();
}
Edit
Based upon your comments, I think the error message is now due to your code not finding the control in question. So
CheckBox chkCol0 = (CheckBox)GridView1.HeaderRow.Cells[0].FindControl("chkCol0");
does not find the control called "chkCol0" and so therefore chkCol0 is null.
I want to display,insert,update,delete in DataGrid (Asp.net and Sqlserver2008) and then i want to export data from datagrid to excel file.
Table Structure
Default.aspx
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="_Default" EnableEventValidation="false"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>'A'</title>
<style type="text`/css">`
.Gridview
{
font-family: Verdana;
font-size: 10pt;
font-weight: normal;
color: black;
}
</style>
<script type="text/javascript">
function ConfirmationBox(username) {
var result = confirm('Are you sure you want to delete ' + username + ' Details?');
if (result) {
return true;
}
else {
return false;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="gvDetails" DataKeyNames="UserId,UserName" runat="server" AutoGenerateColumns="false"
CssClass="Gridview" HeaderStyle-BackColor="#61A6F8" ShowFooter="true" HeaderStyle-Font-Bold="true"
HeaderStyle-ForeColor="White" OnRowCancelingEdit="gvDetails_RowCancelingEdit"
OnRowDeleting="gvDetails_RowDeleting" OnRowEditing="gvDetails_RowEditing"
OnRowUpdating="gvDetails_RowUpdating"
OnRowCommand="gvDetails_RowCommand" Height="275px" Width="530px">
<Columns>
<asp:TemplateField>
<EditItemTemplate>
<asp:ImageButton ID="imgbtnUpdate" CommandName="Update" runat="server"
ImageUrl="~/Images/update.jpg" ToolTip="Update" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnCancel" runat="server" CommandName="Cancel"
ImageUrl="~/Images/Cancel.jpg" ToolTip="Cancel" Height="20px" Width="20px" />
</EditItemTemplate>
<ItemTemplate>
<asp:ImageButton ID="imgbtnEdit" CommandName="Edit" runat="server"
ImageUrl="~/Images/Edit.jpg" ToolTip="Edit" Height="20px" Width="20px" />
<asp:ImageButton ID="imgbtnDelete" CommandName="Delete" runat="server"
ImageUrl="~/Images/delete.jpg" ToolTip="Delete" Height="20px" Width="20px" />
</ItemTemplate>
<FooterTemplate>
<asp:ImageButton ID="imgbtnAdd" runat="server" ImageUrl="~/Images/AddNewitem.jpg"
CommandName="AddNew" Width="30px" Height="30px" ToolTip="Add new User" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="UserName">
<EditItemTemplate>
<asp:Label ID="lbleditusr" runat="server" Text='<%#Eval("Username") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblitemUsr" runat="server" Text='<%#Eval("UserName") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrusrname" runat="server" />
<asp:RequiredFieldValidator ID="rfvusername" runat="server" ControlToValidate="txtftrusrname"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="City">
<EditItemTemplate>
<asp:TextBox ID="txtcity" runat="server" Text='<%#Eval("City") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblcity" runat="server" Text='<%#Eval("City") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrcity" runat="server" />
<asp:RequiredFieldValidator ID="rfvcity" runat="server" ControlToValidate="txtftrcity"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Designation">
<EditItemTemplate>
<asp:TextBox ID="txtstate" runat="server" Text='<%#Eval("Designation") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblstate" runat="server" Text='<%#Eval("Designation") %>' />
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtftrDesignation" runat="server" />
<asp:RequiredFieldValidator ID="rfvdesignation" runat="server" ControlToValidate="txtftrDesignation"
Text="*" ValidationGroup="validaiton" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle BackColor="#61A6F8" Font-Bold="True" ForeColor="White"></HeaderStyle>
</asp:GridView>
</div>
<div>
<asp:Label ID="lblresult" runat="server"></asp:Label>
</div>
<div>
<asp:Button ID="btn_Excel" runat="server" Text="Excel"
onclick="btn_Excel_Click" />
</div>
</form>
</body>
</html>
Default.aspx.cs
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Reflection;
using System.IO;
using System.Collections;
public partial class _Default : System.Web.UI.Page
{
private SqlConnection con = new SqlConnection("Data Source=.;uid=sa;pwd=sa123;database=Example1");
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindEmployeeDetails();
}
}
protected void BindEmployeeDetails()
{
con.Open();
SqlCommand cmd = new SqlCommand("Select * from Employee_Details", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
if (ds.Tables[0].Rows.Count > 0)
{
gvDetails.DataSource = ds;
gvDetails.DataBind();
}
else
{
ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
gvDetails.DataSource = ds;
gvDetails.DataBind();
int columncount = gvDetails.Rows[0].Cells.Count;
gvDetails.Rows[0].Cells.Clear();
gvDetails.Rows[0].Cells.Add(new TableCell());
gvDetails.Rows[0].Cells[0].ColumnSpan = columncount;
gvDetails.Rows[0].Cells[0].Text = "No Records Found";
}
}
protected void gvDetails_RowEditing(object sender, GridViewEditEventArgs e)
{
gvDetails.EditIndex = e.NewEditIndex;
BindEmployeeDetails();
}
protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
int userid = Convert.ToInt32(gvDetails.DataKeys[e.RowIndex].Value.ToString());
string username = gvDetails.DataKeys[e.RowIndex].Values["UserName"].ToString();
TextBox txtcity = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtcity");
TextBox txtDesignation = (TextBox)gvDetails.Rows[e.RowIndex].FindControl("txtstate");
con.Open();
SqlCommand cmd = new SqlCommand("update Employee_Details set City='" + txtcity.Text + "',Designation='" + txtDesignation.Text + "' where UserId=" + userid, con);
cmd.ExecuteNonQuery();
con.Close();
lblresult.ForeColor = Color.Green;
lblresult.Text = username + " Details Updated successfully";
gvDetails.EditIndex = -1;
BindEmployeeDetails();
}
protected void gvDetails_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
gvDetails.EditIndex = -1;
BindEmployeeDetails();
}
protected void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
int userid = Convert.ToInt32(gvDetails.DataKeys[e.RowIndex].Values["UserId"].ToString());
string username = gvDetails.DataKeys[e.RowIndex].Values["UserName"].ToString();
con.Open();
SqlCommand cmd = new SqlCommand("delete from Employee_Details where UserId=" + userid, con);
int result = cmd.ExecuteNonQuery();
con.Close();
if (result == 1)
{
BindEmployeeDetails();
lblresult.ForeColor = Color.Blue;
lblresult.Text = username + " details deleted successfully";
}
}
protected void gvDetails_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
//getting username from particular row
string username = Convert.ToString(DataBinder.Eval(e.Row.DataItem, "UserName"));
//identifying the control in gridview
ImageButton lnkbtnresult = (ImageButton)e.Row.FindControl("imgbtnDelete");
//raising javascript confirmationbox whenver user clicks on link button
if (lnkbtnresult != null)
{
lnkbtnresult.Attributes.Add("onclick", "javascript:return ConfirmationBox('" + username + "')");
}
}
}
protected void gvDetails_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox txtUsrname = (TextBox)gvDetails.FooterRow.FindControl("txtftrusrname");
TextBox txtCity = (TextBox)gvDetails.FooterRow.FindControl("txtftrcity");
TextBox txtDesgnation = (TextBox)gvDetails.FooterRow.FindControl("txtftrDesignation");
con.Open();
SqlCommand cmd =
new SqlCommand("insert into Employee_Details(UserName,City,Designation) values('"
+ txtUsrname.Text + "','" + txtCity.Text + "','" + txtDesgnation.Text + "')", con);
int result = cmd.ExecuteNonQuery();
con.Close();
if (result == 1)
{
BindEmployeeDetails();
lblresult.ForeColor = Color.Blue;
lblresult.Text = txtUsrname.Text + " Details inserted successfully";
}
else
{
lblresult.ForeColor = Color.Red;
lblresult.Text = txtUsrname.Text + " Details not inserted";
}
}
}
protected void btn_Excel_Click(object sender, EventArgs e)
{
this.gvDetails.AllowPaging = false;
this.gvDetails.AllowSorting = false;
this.gvDetails.EditIndex = -1;
this.BindEmployeeDetails();
Response.Clear();
Response.ContentType = "application/vnd.xls";
Response.AddHeader("content-disposition", "attachment;filename=MyList.xls");
Response.Charset = "";
StringWriter swriter = new StringWriter();
HtmlTextWriter hwriter = new HtmlTextWriter(swriter);
gvDetails.RenderControl(hwriter);
Response.Write(swriter.ToString());
Response.End();
}
public override void VerifyRenderingInServerForm(Control control)
{
//to Render Control
}
}
My code works fine.
But my excel file looks like this
Excel output
So i don't want the images in datagrid to be exported.
How can i do that.
Kindly reply.
Ok i got the solution (From a colleague).
Please vote my answer if its correct.
Explanation:
1.We have to first make a temporary table.
2.Now add only the required column from datagrid.
3.Use temporary table to Export data in Excel.
Code:In the Button click call the function ExportUsersDataTable
protected void btn_Excel_Click(object sender, EventArgs e){ExportUsersDataTable()}
The function definition is:
public void ExportUsersDataTable()
{
con.Open();
SqlCommand cmd = new SqlCommand("Select * from Employee_Details", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
string sFilename = "UserToRoleMapping.xls";
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.Charset = ""; //string.Empty;
response.ContentType = "application/vnd.ms-excel";
response.AddHeader("Content-Disposition", "attachment;filename=\"" + sFilename + "\"");
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
GridView gvTemp = new GridView();
//Temporary Table for changing the ExcelSheet Headers
DataTable dtTemp = new DataTable();
dtTemp.Columns.Add("User Id");
dtTemp.Columns.Add("User Name");
dtTemp.Columns.Add("City");
dtTemp.Columns.Add("Designation");
dtTemp.AcceptChanges();
if (ds.Tables[0].Rows.Count > 0)
{
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
DataRow dr = dtTemp.NewRow();
dr["User Id"] = ds.Tables[0].Rows[i]["UserId"].ToString();
dr["User Name"] = ds.Tables[0].Rows[i]["UserName"].ToString();
dr["City"] = ds.Tables[0].Rows[i]["City"].ToString();
dr["Designation"] = ds.Tables[0].Rows[i]["Designation"].ToString();
dtTemp.Rows.Add(dr);
dtTemp.AcceptChanges();
}
}
if (dtTemp.Rows.Count > 0)
{
gvTemp.DataSource = dtTemp;
gvTemp.DataBind();
gvTemp.RenderControl(htw);
response.Write(sw.ToString());
}
response.End();
}
}
}