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Regular Expression for Emailid Validation

 Regular Expression is
  1. \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 
 
after Adding with Textbox code  will look like as follows
  1. <asp:TextBox ID="txtmail" ValidationGroup="Validform" runat="server</asp:TextBox> 
  2. <asp:RegularExpressionValidator ID="revEmail" runat="server"
  3.  ErrorMessage="Invalid Email Address"
    ControlToValidate="txtmail"
  4. SetFocusOnError="true"
  5.  ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
    ValidationGroup="Validform" Display="Dynamic" ForeColor="#CC0000"></asp:RegularExpressionValidator>