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<div>
<asp:TextBox ID="TextBox1" runat="server" ValidationGroup="ABC"></asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1" runat="server"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="TextBox1"
Text="!"
ValidationGroup="ABC"></asp:RequiredFieldValidator>
<asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="ABC" />
</div>