private void btnSubmit_Click(object sender, EventArgs e)
 {
     if (isValidData())
     {
         Visit newVisit = new Visit();
         newVisit.VisitID = visit.VisitID;
         this.PutVisitData(newVisit);
         try
         {
             if (!VisitsController.UpdateVisit(visit, newVisit))
             {
                 MessageBox.Show("Another user has updated or " +
                                 "deleted that patient.", "Database Error");
                 this.DialogResult = DialogResult.Retry;
             }
             else
             {
                 visit = newVisit;
                 MessageBox.Show("Visit was successfully modified.", "Successful Modification");
                 this.Close();
             }
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.Message, ex.GetType().ToString());
         }
     }
 }