private void editButton_Click(object sender, EventArgs e)
 {
     if (personInfo.ID >= 0)
     {
         if (personInfo.TypeOfPerson == PersonType.Student)
         {
             StudentForm studentForm = new StudentForm(Tennis_Club.StudentList[personInfo.ID], Tennis_Club.GetStudentImage(personInfo.ID));
             studentForm.SaveStudent += studentForm_SaveExistingStudent;
             studentForm.ShowDialog();
             if (!studentForm.IsDisposed)
             {
                 studentForm.Dispose();
             }
         }
         else
         {
             CoachForm coachForm = new CoachForm(Tennis_Club.CoachList[personInfo.ID], Tennis_Club.GetCoachImage(personInfo.ID));
             coachForm.SaveCoach += coachForm_SaveExistingCoach;
             coachForm.ShowDialog();
             if (!coachForm.IsDisposed)
             {
                 coachForm.Dispose();
             }
         }
     }
     else
     {
         MessageBox.Show("No person selected.", "Tennis Management Software", MessageBoxButtons.OK, MessageBoxIcon.Information);
     }
 }
        private void coachToolStripMenuItem_Click(object sender, EventArgs e)
        {
            CoachForm coachForm = new CoachForm((uint)Tennis_Club.CoachList.Count());

            coachForm.SaveCoach += coachForm_SaveNewCoach;
            coachForm.ShowDialog();
            if (!coachForm.IsDisposed)
            {
                coachForm.Dispose();
            }
        }