private void btnSubmit_Click(object sender, EventArgs e) { if (Patient == null) { MessageBox.Show(@"Something is going wrong please check again.", @"Error"); } else { if (_chkIn.CheckWaitinglist(Patient.Id)) { _chkIn.SubmitService(this, DateTime.Now.TimeOfDay); var print = new PrintWaitingForm(); if (WaitingList != null) { print.WaitingList = WaitingList; } print.Show(); ClearControl(); } else { MessageBox.Show( @"You didn't select any category yet . Please select at least one category to checkin.", @"Empty Selection"); } } }