public IQueryable<ContactInformation> searchByPhone(string phone, int userID)
 {
     LINQDatabaseService ds = new LINQDatabaseService();
     if (ds.phoneExists(phone, userID) == true)
         return ds.getContact(new string[] { phone }, "Phone", userID);
     return null;
 }
 public IQueryable<ContactInformation> searchByFullName(string firstName, string lastName, int userID) 
 {
     LINQDatabaseService ds = new LINQDatabaseService();
     if (ds.fullNameExists(firstName, lastName, userID) == true)
         return ds.getContact(new string[] {firstName, lastName}, "Name", userID);
     return null;
 }