>>>Is it possible to validate email address such that only emails that have a certain domain are allowed. For example, that only "yahoo.com" emails are allowed. (e.g. name@yahoo.com, name2@yahoo.com). But emails like name@msn.com are rejected? TIA.
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>>If it is inside your application, just parsing would do it. You may enter a list of domains and filter them out, or in your case, validate them against your validation rules.
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>Yes, this is within my application. Doing it "in code" my approach too. I just thought that maybe .NET already has a class that does it.

I've a feeling that you're requirements may not be as simple as they sound (if so pls enlarge) but:

string address = "fred@google.com";
string domain = "@GOOGLE.COM";
bool isValid = address.EndsWith(domain.ToUpper());