asp.net下拉列表的填充的后台编写

asp.net后台下拉列表的填充

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //初始化菜品下拉框
                this.ddlCategory.DataValueField = "CategoryId";
                this.ddlCategory.DataTextField = "CategoryName";
                this.ddlCategory.DataSource = new DAL.DishService().GetAllCategory();
                this.ddlCategory.DataBind();
            }
        }