The way I do it is to just send the email via ajax to a validation script that returns back an xml response.
$("#signup-form #email").blur(function() { $.get("/ajax/emailcheck", { email: $("#email").val() }, function (xml) { if ($('status',xml).text() == 1) { // Available and valid $("#email").css("border","1px solid green"); } else { $("#email").css("border","2px solid red").focus(); } $("#email-note").html($("html",xml).text()); },"xml"); return false; }); This is what the following would send and the response they would get http://www.murmp.com/ajax/emailcheck?email=invalid <?xml version="1.0" encoding="UTF-8"?> <response> <status>0</status> <html>Not a valid email address</html> </response> http://www.murmp.com/ajax/emailcheck?email=va...@email.com <?xml version="1.0" encoding="UTF-8"?> <response> <status>1</status> <html>Email available</html> </response> http://www.murmp.com/ajax/emailcheck?email=jsu...@murmp.com <?xml version="1.0" encoding="UTF-8"?> <response> <status>0</status> <html>Email already in use</html> </response> On the backend, I use a free/open-source validation class. I'm sure that there are similar projects for .net http://code.google.com/p/php-email-address-validation You can see this in action at (shameless plug) http://www.murmp.com/signup Hope that helps! -Jonathon On May 22, 5:06 am, gladrinkz <gladri...@gmail.com> wrote: > is ant one know how can i set email validation in jquery i am > using .net