asp.net - How validate for domain name of email address -

i have form in user enters email address.i validating through java script.i want validate domain name of email address best way validate domain name of email address in .net ?

best way check domain name in email address use regular expression expression use validation email \w+([-+.']\w+)@\w+([-.]\w+).\w+([-.]\w+)* can edit domain part in expression \w+([-.]\w+)*\