Error: Sys.WebForms.PageRequestManagerServerErrorException: 'column' has a SelectedValue which is invalid because it does not exist in the list of items.

[Venkatesh]

Hi,
I have a radgrid. I have added a dropdown in the radgrid, which is as follows:

<ItemTemplate>
<asp:DropDownList ID="ddlGender" runat="server" SelectedValue='<%# Eval("UGender") %>' />
<asp:TextBox ID="txtUserId" ReadOnly="true" runat="server" Text='<%# Eval("UserId") %>'  />
  </ItemTemplate>

                                                <InsertItemTemplate>
                                                    <asp:DropDownList ID="ddlGender" runat="server">
                                                        <asp:ListItem Text="Male" Value="Male"></asp:ListItem>
                                                        <asp:ListItem Text="Female" Value="Female"></asp:ListItem>
                                                    </asp:DropDownList>
                                                    <asp:TextBox ID="txtUserId" runat="server" ></asp:TextBox>
                                                    </InsertItemTemplate>

In the Insertcommand, i am setting the value to a datatable as below:

DataTable test1 = new DataTable();

            GridDataInsertItem item = (GridDataInsertItem)e.Item;

            DropDownList ddlGender = (DropDownList)item.FindControl("ddlGender");
            string ddlGendervalue = ddlGender.SelectedValue;

            DataRow dr = test1.NewRow();

            dr["UGender"] = ddlGendervalue;
test1.Rows.Add(dr);
radgridl.DataSource = this.test1;

I am getting the selected value of the dropdown. However, i am getting the below javascript error and insert is not happening.

Sys.WebForms.PageRequestManagerServerErrorException: 'ddlGender' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

How to fix this?

Thanks

[Shinu]

Hi,

Please try setting the DataSourceID,DataTextField,DataValueField  property for the DropDownList as an example shown below.

ASPX:

<telerik:GridTemplateColumn>
    <ItemTemplate>
        <asp:DropDownList ID="ddlGender" DataSourceID="SqlDataSource1" runat="server" DataTextField="UGender"
            DataValueField="UGender" SelectedValue='<%# Eval("UGender") %>' />
        <asp:TextBox ID="txtUserId" ReadOnly="true" runat="server" Text='<%# Eval("UserId") %>' />
    </ItemTemplate>
</telerik:GridTemplateColumn>

Thanks,
Shinu.