I have a DropDown List where I have brought the values from my Database using code-behind.
I have added a new value after reading data from source, called ".. Add new skill".
Now when user clicks on that item I need a small page (or rather a new page) to open to add the skills that are not mentioned in the DropDownList.
if (!IsPostBack)
{
SqlConnection myConn = new SqlConnection(#"Data Source=USER-PC\SQLEXPRESS;Initial Catalog=KKSTech;Integrated Security=True");
SqlCommand myCmd = new SqlCommand(
"SELECT SkillName, SkillID FROM Skills", myConn);
myConn.Open();
SqlDataReader myReader = myCmd.ExecuteReader();
//Set up the data binding.
DropDownList1.DataSource = myReader;
DropDownList1.DataTextField = "SKillName";
DropDownList1.DataValueField = "SkillID";
DropDownList1.DataBind();
//Close the connection.
myConn.Close();
myReader.Close();
//Add the item at the first position.
DropDownList1.Items.Insert(0, "..Add New Skill");
}
This is my code-behind file.. How do I link that now?
You should use the SelectedIndexChanged event and SelectedValue property:
void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
if(String.Compare(ddl.SelectedValue,"..Add New Skill",true)==0)
Response.Redirect("Add_New_Skill.aspx");
}
Add a SelectedIndexChanged event handler to that dropdown like this
void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
if(ddl.SelectedIndex == 0)
Response.Redirect("Add_New_Skill.aspx");
}
If you want position of "...Add new skill" to be at last of the list
Use this
ddl.Items.Insert(ddl.Items.Count, "...Add New Skill");
Now to redirect to another page you should do this
void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
if(ddl.SelectedIndex == ddl.Items.Count-1)
Response.Redirect("Add_New_Skill.aspx");
}
Set AutoPostBack to true. That way when the user changes an option, it will automatically post the page to the server.
Handle this SelectedIndexChanged event, and redirect to your add page there.
Take your user to a add page.
Add the details to the database.
Bring the user back to this page.
List will be reloaded from database, and you till get your value.
No special linking is required.
This is working
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bindDropdownlist()
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
string getvalue = DropDownList1.SelectedItem.Value;
if (getvalue == "..Add New Skill")
{
Response.Redirect("Default.apsx");
}
}
public void bindDropdownlist()
{
SqlDataAdapter dap = new SqlDataAdapter("select coloumn1,colum2 from table", con);
DataSet ds = new DataSet();
dap.Fill(ds);
DropDownList1.DataSource = ds.Tables[0];
DropDownList1.DataTextField = "coloumn1";
DropDownList1.DataValueField = "colum2 ";
DropDownList1.DataBind();
DropDownList1.Items.Insert(0, "..Add New Skill");
}
}
<div>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
</div>
Related
I have a drop down list ; a sqldatasource and a gridview .
I want to fill the grid view by the choice in the drop down list.
How can i implement this fill ?
Thanks
My question is not a duplicate of this Click
because it want to populate a drop down list inside the grid view instead my question is : by a choice of a drop down list , fill a grid view.
EDIT (Because i am in negative rep.) :
What i have tried
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.BindData();
}
}
private void BindData()
{
string query = "SELECT top 10 * FROM Customers";
SqlCommand cmd = new SqlCommand(query);
gvCustomers.DataSource = GetData(cmd);
gvCustomers.DataBind();
}
private DataTable GetData(SqlCommand cmd)
{
string strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
using (SqlConnection con = new SqlConnection(strConnString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
aspx page
<asp:DropDownList runat="server" ID="drp" AutoPostBack="true" OnSelectedIndexChanged="drp_SelectedIndexChanged"></asp:DropDownList>
<asp:GridView runat="server" ID="grd" AutoGenerateColumns="true"></asp:GridView>
code behind of aspx
protected void drp_SelectedIndexChanged(object sender, EventArgs e)
{
BindGrid();
}
private void BindGrid()
{
grd = dataSource;
grd.DataBind();
}
Bind grid on selection index change event of dropdown.
I have a master page in witch more then 30 button like (java,asp,php,sql,c,c++,etc...)
and a have a table of questions. All questions are tagged with one subject like asp,java,etc.
I want to get data according to the click button.
How is it possible?
protected void BindRepeaterData()
{
con.Open();
SqlCommand cmd = new SqlCommand("SELECT * from question", con);
int count = (int)cmd.ExecuteScalar();
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
RepDetails.DataSource = ds;
RepDetails.DataBind();
con.Close();
}
(I think one page for one button is not a good idea.)
There are few ways to capture button click inside Data such as Repeater, GridView, ListView.
Easiest way is to use Command event instead of Click event.
<%-- Let say this button is located inside Repeater control.--%>
<asp:Button ID="DoSomethingButton" runat="server" Text="Home"
OnCommand="DoSomethingButton_Command" CommandArgument="<%# Eval("Id") %>" />
// Retrieve e.CommandArgument from code-behind.
protected void DoSomethingButton_Command(object sender, CommandEventArgs e)
{
int id = Convert.ToInt32(e.CommandArgument);
}
If you want the ID of the button itself, you can cast the sender back to the Button and get it's ID.
protected void Button1_Click(object sender, EventArgs e)
{
Button button = sender as Button;
string id = button.ID;
}
If I understand you question correctly you could select field from the table according to button information for example in this way. And you could use same event handler for different buttons. Hope this helps.
protected void Btn1_Click(object sender, EventArgs e)
{
Button button = sender as Button;
string question = readData(button.Text);
//do further actions
}
private string readData(string subject)
{
string question = string.Empty;
using (SqlConnection con = new SqlConnection(/*connection_string*/))
{
using (SqlCommand cmd = new SqlCommand("SELECT question from question_table where subject = #subject", con))
{
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#subject", subject);
con.Open();
object o = cmd.ExecuteScalar();
if (o != null){
question = o.ToString();
}
con.Close();
}
}
return question;
}
I have dropdownlist on my website. When I select the any item to insert the database but it does not insert selected item always insert the first item inside the dropdown list. Please Help How can I solve that problem?
Here is my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
GetCategory();
}
}
void GetCategory()
{
dlCategory.DataSource = Data.GetDataTable("SELECT * FROM tblCategory");
dlCategory.DataTextField = "CategoryName";
dlCategory.DataValueField = "ID";
dlCategory.DataBind();
dlCategory.Items.Insert(0, new ListItem("--Select--", "0"));
dlCategory.SelectedIndex = dlCategory.Items.IndexOf(dlCategory.Items.FindByText("--Select--"));
}
SqlConnection baglanti = Data.baglan();
SqlCommand tr = new SqlCommand("Insert tblProduct (CategoryID) values(#CategoryID)", baglanti);
tr.Parameters.AddWithValue("#CategoryID", dlCategory.SelectedValue);
tr.ExecuteNonQuery();
Your question is a bit blurry regarding the code, so correct me if I misunderstood, but I presume you want to do the following in WebForms:
Simply show all available categories that can be assigned to a
product
When the user selects the category and hits submit, it will be inserted to the DB assegnied to it
It is not quite elegant, but I would put something like this:
private SqlConnection _sqlConnection = new SqlConnection();
protected void Page_Load(object sender, EventArgs e)
{
_sqlConnection.ConnectionString = #".." //Assign whatever your ConnectionString is in Data.baglan();
_sqlConnection.Open();
if (!IsPostBack)
{
GetCategory();
}
else
{
//Define your insert something like this, and I would put this into the submit Button_Click event:
if (!String.IsNullOrEmpty(dlCategory.SelectedValue) && dlCategory.SelectedValue != "0")
{
SqlCommand tr = new SqlCommand("Insert tblProduct (CategoryID) values (#CategoryID)", _sqlConnection);
tr.Parameters.AddWithValue("#CategoryID", dlCategory.SelectedValue);
tr.ExecuteNonQuery();
}
else
{
//TODO: Handle wrong selection, eg display an error message..
}
}
}
void GetCategory()
{
dlCategory.DataSource = new SqlCommand("SELECT * FROM tblCategory", _sqlConnection).ExecuteReader();
dlCategory.DataTextField = "CategoryName";
dlCategory.DataValueField = "ID";
dlCategory.DataBind();
dlCategory.Items.Insert(0, new ListItem("--Select--", "0"));
dlCategory.SelectedIndex = dlCategory.Items.IndexOf(dlCategory.Items.FindByText("--Select--"));
}
I have a DropDownList which is having few list items. Every time I select any item, based on it I am binding a gridview, hence resulting gridview depends on my selection. Some results are exceeding the pagesize hence I need to navigate on 2nd page in GridView, however the GridView is disappeating when I am selecting 2nd page.
protected void DDL_SelectedIndexChanged(object sender, EventArgs e)
{
string constr = ConfigurationSettings.AppSettings["ConnectionInfo"];
SqlConnection con = new SqlConnection(constr);
con.Open();
string str = string.Empty;
str = "SELECT * FROM Table1";
SqlDataAdapter adp = new SqlDataAdapter(str, con);
DataSet ds = new DataSet();
adp.Fill(ds, "myds");
BusinessKPIGrid.DataSource = ds;
BusinessKPIGrid.DataBind();
}
protected void OnGridViewPaging(object sender, GridViewPageEventArgs e)
{
//I know I need to bind the gridview here, but how ?
BusinessKPIGrid.PageIndex = e.NewPageIndex;
BusinessKPIGrid.DataBind();
}
I don't know how to bind the gridview in paging event, since I do not have any separate binding function.
there is a separate function for page event for grid view..create separate method for binding grid & call that method on pageindexchange event..
protected void BusinessKPIGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
BusinessKPIGrid.PageIndex = e.NewPageIndex;
bindyourgrid();
}
try this
protected void DDL_SelectedIndexChanged(object sender, EventArgs e)
{
string constr = ConfigurationSettings.AppSettings["ConnectionInfo"];
SqlConnection con = new SqlConnection(constr);
con.Open();
string str = string.Empty;
str = "SELECT * FROM Table1";
SqlDataAdapter adp = new SqlDataAdapter(str, con);
DataSet ds = new DataSet();
adp.Fill(ds, "myds");
ViewState["ds"]=ds;
BusinessKPIGrid.DataSource = ds;
BusinessKPIGrid.DataBind();
}
protected void OnGridViewPaging(object sender, GridViewPageEventArgs e)
{
//I know I need to bind the gridview here, but how ?
BusinessKPIGrid.PageIndex = e.NewPageIndex;
BusinessKPIGrid.DataSource = (DataSet)ViewState["ds"];
BusinessKPIGrid.DataBind();
}
From DDL_SelectedIndexChanged if you are searching some thing then use 'PageIndexChanging' and set the page size for it
protected void gvworker_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gvworker.PageIndex = e.NewPageIndex;
//result got from ddl list i.e bind your data set
}
I am looking for the solution to this problem from many days, please help.
I have a grid view and have five dropdownlist on it. I have edit update and cancel edit buttons on each row.
Drop down list is updating the database, but only first value in the dropdownlist even when user select second, third or any other value from the dropdownlist.
What could possible be the reason for this. Here is my row Edit/ CancelEdit and Updating Events.
protected void gvCustomers_RowEditing(object sender, GridViewEditEventArgs e)
{
gvCustomers.EditIndex = e.NewEditIndex;
BindData();
}
protected void gvCustomers_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
gvCustomers.EditIndex = -1;
BindData();
}
protected void gvCustomers_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
Label lblCustId = (Label)gvCustomers.Rows[e.RowIndex].FindControl("cust_id");
DropDownList ddlCsm = (DropDownList)gvCustomers.Rows[e.RowIndex].FindControl("CSM");
DropDownList ddlSrCsm = (DropDownList)gvCustomers.Rows[e.RowIndex].FindControl("SrCSM");
DropDownList ddlDE = (DropDownList)gvCustomers.Rows[e.RowIndex].FindControl("DE");
DropDownList ddlAE = (DropDownList)gvCustomers.Rows[e.RowIndex].FindControl("AE");
DropDownList ddlTE = (DropDownList)gvCustomers.Rows[e.RowIndex].FindControl("TE");
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();
string sql = "Update SOME_TABLE SET CSM= #CSM, SrCSM= #SrCSM ,DE=#DE,AE=#AE,TE=#TE where cust_id=#cust_id";
using (SqlCommand cmd = new SqlCommand(sql, conn))
{
cmd.Parameters.Add("#CSM", SqlDbType.VarChar).Value = ddlCsm.SelectedItem.Value;
cmd.Parameters.Add("#SrCSM", SqlDbType.VarChar).Value = ddlSrCsm.SelectedItem.Value;
cmd.Parameters.Add("#AE", SqlDbType.VarChar).Value = ddlAE.SelectedItem.Value;
cmd.Parameters.Add("#DE", SqlDbType.VarChar).Value = ddlDE.SelectedItem.Value;
cmd.Parameters.Add("#TE", SqlDbType.VarChar).Value = ddlTE.SelectedItem.Value;
cmd.ExecuteNonQuery();
}
}
catch
{ }
gvCustomers.EditIndex = -1;
BindData();
}
}
Any help would be greatly appeciated.
Thanks
just fill the dropdowns on the click of edit button and then use on rowupdating event and use ddl.SelectedValue instead of ddl.SelectedItem.Value. You will find the selected values.
Your Drop Downs are probably getting re-set in your Page_Load event. If they are, load them when the page is not in postback, like so:
if(!Page.IsPostBack) {
//set drop downs
}