Delete Confirmation at GridView

Hi,

I'm trying to prompt for confirmation when the user deletes from a gridview. My codes are not prompting. It'll just delete without prompting. The Edit and Delete link button is at the first column.

Please advise. TIA !

aspx
====
 <asp:GridView ID="GridView2" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="app_id" DataSourceID="SqlDataSource1" EnableModelValidation="True" Height="345px" Width="762px" BorderColor="Black" BorderStyle="Solid" CssClass="auto-style7">
            <Columns>
                <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
                <asp:BoundField DataField="app_id" HeaderText="App ID" InsertVisible="False" ReadOnly="True" SortExpression="app_id" />
                <asp:BoundField DataField="app_name" HeaderText="App Name" SortExpression="app_name" />
                <asp:BoundField DataField="remarks" HeaderText="Remarks" SortExpression="remarks" />
                <asp:BoundField DataField="app_owner_email" HeaderText="App Owner Email" SortExpression="app_owner_email" />
                <asp:BoundField DataField="group_email" HeaderText="Group Email" SortExpression="group_email" />
            </Columns>
        </asp:GridView>
  
Behind codes
============
  protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
    {
    if (e.Row.RowType == DataControlRowType.DataRow)
        {
            // reference the Delete LinkButton
            LinkButton db = (LinkButton)e.Row.Cells[1].Controls[2];

            // Get information about the product bound to the row
            //Nothwind.ProductsRow product = (e.ProductsRow) ((System.Data.DataRowView) e.Row.DataItem).Row;

            db.OnClientClick = string.Format("return confirm('Are you sure you want to delete?');");

        }
    }