asp.net 获取 当前日期时间 及 前后N天日期时间（DropDownList数据绑定）

//今天

DateTime now = DateTime.Now;

//前N天

now.AddDays(-N);

//后N天

now.AddDays(N);

#region Nominate news last ten days

        /// <summary>

        /// Bind New To Nominate

        /// zjf add - 20091222

        /// </summary>

        protected void BindNewToNominate()

        {

            int newCount = 0;

            DateTime now = DateTime.Now;

            DateTime nowAgo = now.AddDays(-10);

            ArticleManager artM = new ArticleManager();

            List<Article> lart = new List<Article>();

            lart = artM.GetList(0, int.MaxValue, "", "UpdateTime between '"+nowAgo+"' and '"+now+"'", "UpdateTime desc", ref newCount);

            this.ddl_NewNominate.DataSource = lart;

            this.ddl_NewNominate.DataTextField = "Title";

            this.ddl_NewNominate.DataValueField = "ArticleId";

            this.ddl_NewNominate.DataBind();           

        }

        #endregion