private void BtnAddStudent_Click(object sender, EventArgs e)
        {
            FrmEstudianteFormulario newForm = new FrmEstudianteFormulario();

            newForm.Show();
            this.Hide();
        }
        private void BtnEditar_Click(object sender, EventArgs e)
        {
            var index = LboxEstudiantes.SelectedIndex;

            if (index < 0)
            {
                MessageBox.Show("Debe seleccionar un estudiante", "Notificacion");
            }
            else
            {
                FrmEstudianteFormulario newForm = new FrmEstudianteFormulario();
                newForm.indexEstudiante = index;
                newForm.Show();
                this.Hide();
            }
        }