private void browseButton_Click(object sender, EventArgs e)
        {
            SelectPersonForm selectPerson = new SelectPersonForm(MainForm.Tennis_Club.StudentFullNameList);

            selectPerson.GetSelectedPerson += selectPerson_GetSelectedStudent;

            if (!selectPerson.IsDisposed)
            {
                selectPerson.ShowDialog();
            }

            selectPerson.Dispose();
        }
        private void cell_MouseClick(object sender, MouseEventArgs e)
        {
            selectedCell = (Cell)sender;

            SelectPersonForm selectPersonFRM = new SelectPersonForm(MainForm.Tennis_Club.StudentFullNameList);

            selectPersonFRM.GetSelectedPerson += selectPersonFRM_GetSelectedPerson;
            selectPersonFRM.ShowDialog();

            if (!selectPersonFRM.IsDisposed)
            {
                selectPersonFRM.Dispose();
            }
        }