private void button3_Click(object sender, EventArgs e)
 {
     AddProduct addPro = new AddProduct();
     addPro.Show();
     this.Visible = false;
     //this.Hide();
 }
        private void button3_Click(object sender, EventArgs e)
        {
            AddProduct addPro = new AddProduct();

            addPro.Show();
            this.Visible = false;
            //this.Hide();
        }