private void button3_Click(object sender, EventArgs e)
{
bb.Product_Id = Convert.ToInt16(textBox1.Text);
bb.Product_Name = textBox2.Text;
bb.Category_Id = Convert.ToInt16(textBox3.Text);
bb.UnitPrice = Convert.ToInt16(textBox4.Text);
bb.UnitInstock = Convert.ToInt16(textBox5);
bb.insert_record();
}