Best way for retrieving single record results in LINQ to SQL

Question

If I query a table with a condition on the key field as in:

        var user = from u in dc.Users
                   where u.UserName == usn
                   s         


        

Answer 1

Another option is to use Contains(username) as opposed to "=="

var user = (from u in dc.UserInfo 
                      where u.Users.Contains(username) 
                      select u).SingleOrDefault();