Question

So I have some GridView. When you edit a row, a particular column changes from a label to a DropDownList. The content of this drop down is populated via some SQL data source.
The user may make a selection choice and click “Update”.

How can I actually get at the SelectedValue property of the drop down?

I thought this would work:

    <asp:GridView ... >
        <Columns>
            ...
                <EditItemTemplate>
                    <asp:DropDownList ID="ServiceCategoriesGvDropDown" AutoPostBack="True" .../>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ... />
                </ItemTemplate>
            </asp:TemplateField>
            ...
        </Columns>
    </asp:GridView>   

And then wire it up with a ControlParameter in my SqlDataSource:

    <UpdateParameters>
        ...
        <asp:ControlParameter ControlID="ServiceCategoriesGvDropDown" PropertyName="SelectedValue" ... />
    </UpdateParameters>

However, I get the following exception:

System.InvalidOperationException: Could not find control ‘ServiceCategoriesGvDropDown’ in ControlParameter ‘ServiceCategoriesID’.

So clearly my drop down doesn’t get found. Perhaps it’s been destroyed by this point?

Answer 1

try this in the updating event of the grid.

 protected void YourGrid_RowUpdating(object sender, GridViewUpdateEventArgs e)
 {
  DropDownList ddl= (DropDownList )YourGrid.Rows[e.RowIndex].FindControl("ddlId");
  string selectedvalue=ddl.selectedvalue;
  //Your update code goes here
 }