Hi,

I tested your code, you just need to fix the RegularExpressionValidator for Email(TextBox ID="txtEmail")like this:

<asp:RegularExpressionValidator ID="regexEmailValid" runat="server" ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ControlToValidate="txtEmail" ErrorMessage="Invalid Email Format"></asp:RegularExpressionValidator>

now it is working