Get full name by log in name in sharepoint

Is there an easy way to retrieve fullname e.g "John Smith" from its login name "j.smith" in sharepoint? Ive been ages looking for that code.

I have this code:

string strName =SPUtility.GetAccountName("j.smith");

Where strName should be my fullname and "j.smith" is my login name. I dont think its correct..any advice from sharepoint masters out there?