when i press button id is btnshow it is not showing uploaded excel file data in gridview , what could be a problem?
protected void btnupload_Click(object sender, EventArgs e)
{
if (System.IO.Path.GetExtension(FileUpload1.FileName) == ".xls" || System.IO.Path.GetExtension(FileUpload1.FileName) == ".xlsx")
{
FileUpload1.SaveAs(Server.MapPath("~/upload/payment.xlsx"));
Label1.Text = "File Uploded";
}
else
{
Label1.Text = "Upload only Excel File";
}
}
protected void btnshow_Click(object sender, EventArgs e)
{
string currpath = Server.MapPath("~/upload/payment.xlsx");
string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + currpath + ";Extended Properties=Excel 12.0";
OleDbConnection oledbConn = new OleDbConnection(connString);
try
{
oledbConn.Open();
OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]", oledbConn);
OleDbDataAdapter objAdapter1 = new OleDbDataAdapter();
objAdapter1.SelectCommand = cmd;
DataSet objDataset1 = new DataSet();
objAdapter1.Fill(objDataset1, "ExcelData");
GridView1.DataSource = objDataset1;
GridView1.DataBind();
}
catch (Exception ex)
{
Label1.Text = "" + ex;
}
finally
{
oledbConn.Close();
}
`
You need to set datasource to a table, not to the dataset.
EDIT : By default datasource will be set to Tables[0]. So your code should work fine. But in the markup you should have AutoGenerateColumns="true" for the GridView:
<asp:GridView ID="GridView1" AutoGenerateColumns="true" runat="server"></asp:GridView>
You can download the project I have used to test your code here.
Related
I need help how to add an ImageUrl to an ImageControl programmatically. I got this code, but I can't (I don't know how) add path that is stored in database.
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string str = FileUpload1.FileName;
FileUpload1.PostedFile.SaveAs(Server.MapPath(".") + "//images//" + str);
string path = "~//images//" + str.ToString();
con.Open();
SqlCommand cmd = new SqlCommand("insert into upload values('" + TextBox1.Text + "','" + path + "')", con);
cmd.ExecuteNonQuery();
con.Close();
Label1.Text = "Image uploaded";
SqlDataAdapter da = new SqlDataAdapter("Select img from upload", con);
DataTable dt = new DataTable();
da.Fill(dt);
Image1.ImageUrl =
}
else
{
Label1.Text = "Please select image";
}
}
For that particular scenario, you already have an image filename and path. All you need is Image1.ImageUrl = ResolveUrl("~/images/" + fileName);.
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string fileName = FileUpload1.FileName;
string path = string.Format("{0}\\images\\{1}",
HttpRuntime.AppDomainAppPath, fileName);
FileUpload1.PostedFile.SaveAs(path);
/* Save image information to database */
Image1.ImageUrl = ResolveUrl("~/images/" + fileName);
}
else
{
Label1.Text = "Please select image";
}
}
FYI: Your code is prone to SQL Injection attack. Make sure you use Parameterized Query.
I am getting this error on a row command in my gridview. Here is the code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection con = new SqlConnection();
con.ConnectionString = University.GetConnectionString();
con.Open();
string query = "select [CourseCode], [CourseNumber], [CourseName], [CRN], [Level], [Credit] from CourseTable where Term='" + MyGlobals.currentTerm + " " + MyGlobals.currentYear + "'";
SqlDataAdapter adap = new SqlDataAdapter(query, con);
DataTable tab = new DataTable();
adap.Fill(tab);
gCourses.DataSource = tab;
gCourses.DataBind();
}
}
protected void gCourses_RowCommand(object sender, GridViewCommandEventArgs e)
{
// *** Retreive the DataGridRow
int row = -1;
int.TryParse(e.CommandArgument as string, out row);
GridViewRow gdrow = gCourses.Rows[row];
DataRow dr = ((DataTable)this.gCourses.DataSource).Rows[gdrow.DataItemIndex];
string crn = dr["CRN"].ToString();
}
.
DataRow dr = ((DataTable)this.gCourses.DataSource).Rows[gdrow.DataItemIndex];
line throws the exception.
What is wrong here? Thanks
Remove the
if (!isPostback)
from your page load
I have written a code to insert the data to SQL LITE database as follows
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
count = 0;
Session["x"] = "session value";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string path = Server.MapPath("bin/sampldb.db");
SQLiteConnection conn = new SQLiteConnection("Data Source=" + path + "");
try
{
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = conn;
string txt="insert into stu values("+TextBox1.Text +",'"+TextBox2.Text+"')";
cmd.CommandType = CommandType.Text;
cmd.CommandText = txt;
cmd.ExecuteNonQuery();
conn.Close();
}
catch (Exception ex)
{
Label1.Visible = true;
Label1.Text = "Error:" + ex.Message;
}
}
After inserting while retrieving data Session is getting null I don't know why
protected void Button2_Click(object sender, EventArgs e)
{
if (Session["x"] != null) // Getting Null here
{
Label1.Visible = true;
Label1.Text = Session["x"].ToString();
DataSet m_oDataSet = new DataSet();
string path = Server.MapPath("bin/sampldb.db");
SQLiteConnection conn = new SQLiteConnection("Data Source=" + path + "");
try
{
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
string txt = "select * from stu";
cmd.CommandText = txt;
SQLiteDataAdapter adp = new SQLiteDataAdapter();
adp.SelectCommand = cmd;
adp.Fill(m_oDataSet);
GridView1.DataSource = m_oDataSet.Tables[0];
GridView1.DataBind();
}
catch (Exception ex)
{
Label1.Visible = true;
Label1.Text = "Error:" + ex.Message;
}
finally
{
conn.Close();
}
}
}
The same code when tested in Sql server 2008 works fine
protected void BtnSqlInsert_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(cnstr);
con.Open();
SqlCommand cmd = new SqlCommand("Insert into [User] values ('" + TextBox1.Text + "','" + TextBox2.Text + "')", con);
cmd.ExecuteNonQuery();
con.Close();
}
protected void BtnSqlGet_Click(object sender, EventArgs e)
{
if (Session["x"] != null) //Able to get session here
{
Label1.Visible = true;
Label1.Text = Session["x"].ToString();
}
}
My sql lite path is from Bin folder as shown in image
your app writes to DB (which is in BIN folder). That causes app restart => in-proc session gets lost. You should NOT solve the consequence (by using StateServer mode), you should fix the original reason - move db file into another folder, away from BIN folder.
i have a code performing paging and sorting in grid view.
(bing_grid is user defined function)
public void bind_grid()
{
con = new SqlConnection();
con.ConnectionString = "Data Source=STIRAPC105;InitialCatalog=anitha;Integrated Security=True";
con.Open();
SqlDataAdapter sqa = new SqlDataAdapter("select * from employees", con);
DataSet ds = new DataSet();
sqa.Fill(ds);
DataTable mytab = ds.Tables[0];
GridView1.DataSource = mytab;
GridView1.DataBind();
//con.Close();
}
code for paging
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
bind_grid();
}
code for sorting
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dt = GridView1.DataSource as DataTable;
if (dt != null)
{
DataView dataview = new DataView(dt);
dataview.Sort = e.SortExpression + " " + sort_grid(e.SortDirection);
GridView1.DataSource = dataview;
GridView1.DataBind();
}
}
user defined code for sorting
public string sort_grid()
{
string newSortDirection = String.Empty;
switch (sortDirection)
{
case SortDirection.Ascending:
newSortDirection = "ASC";
break;
case SortDirection.Descending:
newSortDirection = "DESC";
break;
}
return newSortDirection;
}
paging works, Errors was:
1. "no overload for method 'sort_grid' takes 1 argument" (dataview.Sort = e.SortExpression + " " + sort_grid(e.SortDirection);)
2.The name 'sortDirection does not exist in the current context. (switch (sortDirection))
Help me friends.
this method:
public string sort_grid()
takes no arguments but you are trying to call it with e.SortDirection:
dataview.Sort = e.SortExpression + " " + sort_grid(e.SortDirection);
You must change the signature of sort_grid() to
sort_grid(SortDirection sortDirection)
This will also solve your second problem, which you are trying to use sortDirection variable, before declaring it in the method sort_grid.
public partial class Gridvw_expt2 : System.Web.UI.Page
{
SqlCommand com;
SqlDataAdapter da;
DataSet ds;
SqlConnection con=new SqlConnection(ConfigurationManager.ConnectionStrings["gj"].ConnectionString);
protected void Page_Load(object sender, EventArgs e)
{
com = new SqlCommand("Select * from tblExpt",con);
da = new SqlDataAdapter(com);
ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows[0] != null)
{
GridView1.AutoGenerateEditButton = true;
GridView1.DataSource = ds;
GridView1.DataBind();
GridView1.RowUpdating += new GridViewUpdateEventHandler(GridView1_RowUpdating);
GridView1.DataKeyNames = new string[] { "id" };
GridView1.RowEditing += new GridViewEditEventHandler(GridView1_RowEditing);
}
else
Response.Write("fkj");
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = GridView1.Rows[e.RowIndex];
int id = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value);
string cls = ((TextBox)(row.Cells[2].Controls[0])).Text;
string nam = ((TextBox)(row.Cells[3].Controls[0])).Text;
foreach (DictionaryEntry entry in e.NewValues)
{
e.NewValues[entry.Key] = Server.HtmlEncode(entry.Value.ToString());
}
com = new SqlCommand("Update tblExpt set name='" + nam + "',class='" + cls + "' where id='" + id + "'", con);
da = new SqlDataAdapter(com);
GridView1.EditIndex = -1;
GridView1.DataSource = ds;
GridView1.DataBind();
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
GridView1.DataSource = ds;
GridView1.DataBind();
}
}
In the above code when i try to access e.new values index out of range exception is thrown.
The table being accessed contains 3 fields id, class, name
Please help to solve the problem.
Read this blog post I wrote on extracting data from gridview (and other data controls). Also, in .net 4.0 if you use 2 way binding (<# Bind("") #>) e.NewValues will be populated.
More info here: http://weblogs.asp.net/davidfowler/archive/2008/12/12/getting-your-data-out-of-the-data-controls.aspx
The exception you get is because row.Cells[0].Controls[0] is a DataControlLinkButton and not a TextBox. Since I don´t know the control layout of your grid you could search for your textbox instead.
Instead of:
int id = int.Parse(((TextBox)(row.Cells[0].Controls[0])).Text);
do something like the code below if there is only one TextBox per row:
TextBox box = (TextBox)row.Cells[0].Controls.OfType<TextBox>().First();
int id = int.Parse( box.Text );
If you have nested html and hierarchies check out this SO question for nested searching of controls