private void button1_Click(object sender, EventArgs e)
        {
            int No_of_rows = controllerObj.AddSupplier(Int16.Parse(textBox2.Text), textBox1.Text, textBox3.Text, textBox4.Text, textBox5.Text);

            if (No_of_rows == 0)
            {
                MessageBox.Show("Insertion Failed");
            }
            else
            {
                MessageBox.Show("Insertion succeeded");
            }
        }