public static void FillDropDownListProductID(DropDownList ddl, SqlInt32 UserID)
{
ProductBAL balProduct = new ProductBAL();
ddl.DataSource = balProduct.SelectDropDownList(UserID);
ddl.DataTextField = "ProductName";
ddl.DataValueField = "ProductID";
ddl.DataBind();
ddl.Items.Insert(0, new ListItem("---Select Product---", "-99"));
}