private void button3_Click(object sender, EventArgs e)
{
Form s = new select_teacher();
s.ShowDialog();
button3.Text = select_teacher.t_num;
}
private void dataGridView3_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 9)//添加课程时选择老师
{
Form g = new select_teacher();
g.ShowDialog();
dataGridView3.CurrentRow.Cells[9].Value = teacher_num;
teacher_nums.Add(teacher_num);
}
}