public void AutoCodeGenerate() { decimal AlreadyExistData = _ItemRepository.AlreadyExistData(); int code = 101; if (AlreadyExistData >= 1) { var GetLastCode = _ItemRepository.GetLastCode(); if (GetLastCode != null) { code = Convert.ToInt32(GetLastCode.Code); code++; } txtCode.Text = code.ToString("000"); } else { txtCode.Text = "101"; } }