private void editToolStripMenuItem_Click(object sender, EventArgs e) { if (teacher.teacherID == 0) { MessageBox.Show("Teacher Not Selected."); return; } AddTeacherForm addTeacherForm = new AddTeacherForm(userAccount, teacher.teacherID); addTeacherForm.ShowDialog(this); dataGridViewTeacher.Rows.Clear(); teacher.GetAllTeacherList(userAccount.ua_department_id, dataGridViewTeacher); }