封装了一个绑定dropdownlist的方法

 /// <summary>
        /// 绑定DropDownList的方法
        /// </summary>
        /// <param name="ddlist">DropDownList的ID</param>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="strText">要绑定的Text</param>
        /// <param name="strValue">要绑定的Value</param>
        public static void BindControl(DropDownList ddlist, DataTable dt, string strText, string strValue)
        {
            ddlist.Items.Clear();
            ddlist.DataSource = dt;
            ddlist.DataTextField = strText;
            ddlist.DataValueField = strValue;
            ddlist.DataBind();
        }