How to validate Email Id

<asp:TextBox ID="txtEmail" runat="server" Width="303px" Enabled="true" ReadOnly="false"> </asp:TextBox>
<asp:RequiredFieldValidator ID="RFVtxtEmailID1" runat="server" ControlToValidate="txtEmail"
InitialValue="" Enabled="true" Text="*" ForeColor="Red" Font-Bold="true" ErrorMessage="Enter Email Address">
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtEmail"
Display="Dynamic" ErrorMessage="Invalid Email Address." ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">*
</asp:RegularExpressionValidator>