private void bttnCargarFormularios_Click(object sender, EventArgs e)
        {
            frmDatosEstudiante Not = new frmDatosEstudiante();

            Not.MdiParent = this;
            Not.Show();

            frmDatosMateria Mate = new frmDatosMateria();

            Mate.MdiParent = this;
            Mate.Show();

            frmDatosNotas Est = new frmDatosNotas();

            Est.MdiParent = this;
            Est.Show();
        }
        private void toolStripMenuItem2_Click(object sender, EventArgs e)
        {
            frmDatosMateria f = new frmDatosMateria();

            f.Show();
        }