У меня есть сетка, которую я хочу проверить, когда она находится в режиме редактирования. Как мне это сделать?

Ниже мое Gridview и ниже это моя первая попытка.

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataSourceID="SqlDataSource1" BackColor="White" BorderColor="#999999" 
        BorderStyle="None" BorderWidth="1px" CellPadding="3" GridLines="Vertical" 
        Width="387px" DataKeyNames = "APPID" AllowPaging="True">
        <PagerSettings Mode="NextPreviousFirstLast" />
        <RowStyle BackColor="#EEEEEE" ForeColor="Black" />
        <Columns>
            <asp:BoundField DataField="APPName" HeaderText="Application" 
                SortExpression="APPName" />
            <asp:BoundField DataField="Description" HeaderText="Description" 
                SortExpression="Description" />
            <asp:CommandField AccessibleHeaderText="Edit" ButtonType="Image" 
                DeleteImageUrl="~/images/bttnDelete.gif" 
                EditImageUrl="~/images/bttnEdit.gif" HeaderText="Action" 
                ShowDeleteButton="True" ShowEditButton="True" 
                ShowHeader="True" CancelImageUrl="~/images/bttnCancel.gif" 
                UpdateImageUrl="~/images/bttnSave.gif" InsertVisible="False" />
        </Columns>
        <FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
        <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" />
        <AlternatingRowStyle BackColor="#DCDCDC" />
    </asp:GridView>

First Attempt

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

If e.Row.RowState = DataControlRowState.Edit Then

            Dim savebtn As ImageButton = DirectCast(e.Row.Cells(2).Controls(0), ImageButton)
            savebtn.ValidationGroup = "grd"

            'set up Name Textbox
            Dim txtname As TextBox = DirectCast(e.Row.Cells(0).Controls(0), TextBox)
            txtname.ValidationGroup = "grd"


            Dim reqval As New RequiredFieldValidator
            reqval.ID = "reqnam"
            reqval.ValidationGroup = "grd"

            reqval.ErrorMessage = "Application Name Cannot Be Empty"
            reqval.ControlToValidate = txtname.UniqueID

        End If