void LoadData()
        {
            //student load and display
            Student_Model s1 = new Student_Model();

            s1.GetAll();

            grdStudent.DataSource = s1.Table;
            grdStudent.Refresh();

            //Parent load and display
            Parent_Model p1 = new Parent_Model();

            p1.GetAll();

            grdParent.DataSource = p1.Table;
            grdParent.Refresh();
            //Menu load and display
            Menu_Model m1 = new Menu_Model();

            m1.GetAll();

            grdMenu.DataSource = m1.Table;
            grdMenu.Refresh();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(textBox2.Text))
            {
                MessageBox.Show("Parent Name is required");
                return;
            }

            if (comboBox2.SelectedItem == null)
            {
                MessageBox.Show("Parent type is required");
                return;
            }

            Parent_Model p1 = new Parent_Model();

            p1.Name = textBox2.Text;
            p1.Type = comboBox2.SelectedItem.ToString() == "Father" ? 0 : 1;
            p1.Create();
            textBox2.Text          = "";
            comboBox2.SelectedItem = null;

            LoadData();
        }