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<!-- jQuery: Validating an email. -->
$('#txtEmail').blur(function(e) {
var sEmail = $('#txtEmail').val();
if ($.trim(sEmail).length == 0) {
alert('Enter valid Email ID');
e.preventDefault();
}
var filter = /^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]
{2,4}|[0-9]{1,3})(\]?)$/;
if (filter.test(sEmail)) {
alert('Valid Email');
}
else {
alert('Email not valid');
e.preventDefault();
}
});
<!-- HTML: Validating an email-->
<asp:TextBox id="txtEmail" runat="server" />