// check if user exists in database
public static bool UserExists(string userName)
{
var q = new QueryUserRecord(userName);
var d = q.Execute();
return(d != null);
}
// return original username
public static string OriginalUsername(string userName)
{
if (!String.IsNullOrEmpty(userName))
{
var q = new QueryUserRecord(userName);
var d = q.Execute();
return(d != null ? d.UserName : null);
}
return(null);
}