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Combobox in Edit Tepmlate Error: Event Listener is null or not an object

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Grid

This is a migrated thread and some comments may be shown as answers.

Mahesh asked on 18 Feb 2009, 12:54 PM

Hello,
I am trying to get a combobox in Edit form as a template.
Firstly I have a RadGrid in that there is a combobox.I binded that successfully.
Upto here there is no problem.But now I have a Edit template form which opens on click of update button.
Here I have two textbox and a combo as a template.I want to show all values in Edit combo that are present in grids combo.I can fetch that again from a database.But the selected value should be same as Grid's combo's selected value.
How to do that.I tried by findcontrol method.I am getting correct combo from edit form.
But when I bind that to database I am not getting.

my Error:

Add Event Listener is null or not an object

My ASPX:

Combobox1 for grid
Combobox2 for Edit Template.

<tr>

<td>

</td>

<td>

</td>

</tr>

<tr>

<td>

Employee_Name:</td>

<td>

<asp:TextBox ID="TextBox10" Text='<%# Bind( "Employee_Name") %>' runat="server">

</asp:TextBox></td>

</tr>

<tr>

<td>

Designation:</td>

<td>

<asp:TextBox ID="TextBox11" Text='<%# Bind( "Employee_Designation") %>' runat="server">

</asp:TextBox></td>

</tr>

<tr><telerik:RadComboBox ID="RadComboBox3" runat="server"></telerik:RadComboBox>

</tr></td></td>

</tr>

</table>

<tr>

<asp:Button ID="Button1" Text='<%# (Container is GridEditFormInsertItem) ? "Insert" : "Update" %>'

runat="server" CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsert" : "Update" %>'>

</asp:Button> 

<asp:Button ID="Button2" Text="Cancel" runat="server" CausesValidation="False" CommandName="Cancel">

</asp:Button>

</td>

</tr>

</table>

</FormTemplate>

</EditFormSettings>

CS

protected void RadGrid2_ItemDataBound(object sender, GridItemEventArgs e)

{

if (e.Item is Telerik.Web.UI.GridDataItem)

{

Telerik.Web.UI.RadComboBox cmb = (Telerik.Web.UI.RadComboBox)e.Item.FindControl("RadComboBox1");

SqlConnection = new SqlConnection("Server=ma;DataBase=Test;User=sa;Password=");

SqlDataAdapter da = new SqlDataAdapter("Select Employee_Id from Employee_Master", SqlConnection);

DataTable dt1 = new DataTable();

da.Fill(dt1);

//string[] options = { "OptionA", "OptionB", "OptionC" };

cmb.DataSource = dt1;

cmb.DataMember = "Employee_Id";

cmb.DataTextField = "Employee_Id";

//cmb.SelectedIndex = i;

cmb.DataBind();

cmb.SelectedItem.Text = dt1.Rows[i]["Employee_Id"].ToString();

i++;

}

if (e.Item is GridEditFormItem && e.Item.IsInEditMode)

{

//GridEditFormItem editFormItem = e.Item as GridEditFormItem;

//GridDataItem parentItem = editFormItem.ParentItem;

//Telerik.Web.UI.RadComboBox box = editFormItem.FindControl("RadComboBox3") as Telerik.Web.UI.RadComboBox;

SqlConnection = new SqlConnection("Server=ma;DataBase=Test;User=sa;Password=");

SqlDataAdapter da1 = new SqlDataAdapter("Select Employee_Id from Employee_Master", SqlConnection);

DataTable dt1 = new DataTable();

da1.Fill(dt1);

//box.DataTextField = parentItem["Employee_Name"].Text;

//box.DataSource = dt1;

//box.DataMember = "Employee_Id";

//box.DataTextField = "Employee_Id";

GridEditFormItem formItem = (GridEditFormItem)e.Item;

RadComboBox dropdown = (RadComboBox)formItem.FindControl("RadComboBox3");

dropdown.DataSource= dt1;

dropdown.DataTextField = "Employee_Id";

dropdown.DataValueField = "Employee_Id";

dropdown.SelectedValue = DataBinder.Eval(formItem.DataItem, "Employee_Id").ToString();

}

Thanks in advance,
-Mahesh

Combobox in Edit Tepmlate Error: Event Listener is null or not an object

3 Answers, 1 is accepted