protected void ProductGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
 {
     ProductGrid1.PageIndex = e.NewPageIndex;
     ProductGrid1.DataBind();
 }
 protected void Page_Load(object sender, EventArgs e)
 {
     SQLDataClass.getAllProducts();
     ProductGrid1.DataSource = SQLDataClass.tblProduct;
     ProductGrid1.DataBind();
 }