[asp:TextBox ID="txtEmailId" runat="server"][/asp:TextBox]
[asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="txtEmailId"
ErrorMessage="*" ValidationGroup="gpRegister"][/asp:RequiredFieldValidator]
[asp:RegularExpressionValidator ValidationExpression="^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"
ID="rxpEmail" runat="server" ErrorMessage="Email Address is not valid" Text="*"
Display="Static" ControlToValidate="txtEmailId" ValidationGroup="gpRegister"][/asp:RegularExpressionValidator]
