protected void BtnAdd_Click(object sender, EventArgs e)
 {
     MultiView1.ActiveViewIndex = 1;
     txtProdNo.Text             = "";
     txtQty.Text        = "";
     txtDesc.Text       = "";
     txtPrice.Text      = "";
     lblMasg2.Text      = "";
     ImgImg.ImageUrl    = "";
     txtProdNo.ReadOnly = false;
     txtProdNo.Text     = Pro.GetNextProdNo();
 }