禁用或启用DropDownList的Items(2)

        private int GetIndexByValue(string value)
        {
            return this._DropDownList.Items.IndexOf(this._DropDownList.Items.FindByValue(value));
        }

        private void DisableItems(int index)
        {
            if (index > -1)
                this._DropDownList.Items[index].Attributes.Add("disabled", "disabled");
        }

        private void EnableItems(int index)
        {
            if (index > -1)
                this._DropDownList.Items[index].Attributes.Remove("disabled");
        }
    }
}
 
 
演示，启用Items:
 if (Request.QueryString["site"] != null)
        {
            InsusDropDownList obj = new InsusDropDownList(this.DropDownList1);
            obj.EnableItemsByText(Request.QueryString["site"]);
        }  



摘自 Insus.NET