Question

I have a GridView in Which I have four TextBoxes in the Template Field. I have one Button below the GridView.

How to validate the TextBoxes in the GridView, When the Button Clicked?

Answer 1

use RequiredFieldValidator and set ValidationGroup="gridview", check below example

   <asp:TemplateField HeaderText="">
          <ItemTemplate>
              <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
               <asp:RequiredFieldValidator ID="rfv" runat="server" ControlToValidate="TextBox3" ValidationGroup="gridview" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
          </ItemTemplate>
            </asp:TemplateField>
          <asp:TemplateField HeaderText="">
                <ItemTemplate>
                    <asp:Button ID="Button2" runat="server" Text="Button" ValidationGroup="gridview" CausesValidation="true" />
                </ItemTemplate>
            </asp:TemplateField>