public static Int32 UpdateContactState(Int32 contactId, bool isAvailable, string state, Int32 callId) { ContactStateDSTableAdapter ta = new ContactStateDSTableAdapter(); ta.Connection.ConnectionString = UcConnection.ConnectionString; System.Nullable <Int32> call_id = Helper.ResolveEmptyInt(callId); return(ta.Update(contactId, isAvailable, state, call_id)); }