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();
        }