private void deleteClassToolStripMenuItem_Click(object sender, EventArgs e)
{
classes css = new classes();
css.MdiParent = this;
css.Show();
}
private void Main_cls_edit_Click(object sender, EventArgs e)
{
classes cs1 = new classes();
cs1.MdiParent = this;
cs1.Show();
}
private void button2_Click(object sender, EventArgs e)
{
classes cls = new classes();
cls.Show();
}