private void ButtonAddGroup(object sender, EventArgs e) { int course = int.Parse(FindViewById <EditText>(Resource.Id.dean_addGroup_Course).Text); int groupNumber = int.Parse(FindViewById <EditText>(Resource.Id.dean_addGroup_GroupNumber).Text); int year = int.Parse(FindViewById <EditText>(Resource.Id.dean_addGroup_EntryYear).Text); if (DataBaseHelper.IsServerAlive()) { if (DataBaseHelper.GetGroupIDByNumberAndYear(groupNumber, year) == -1) { DataBaseHelper.AddNewGroup(course, groupNumber, year); Toast.MakeText(this, "New group is added!", ToastLength.Long).Show(); } else { Toast.MakeText(this, "That group is exist already", ToastLength.Long).Show(); } } else { Toast.MakeText(this, "Server isn't alive", ToastLength.Long).Show(); } Finish(); }