“/”应用程序中的服务器错误。

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行 20:             {
行 21:                 News n = new NewsDal().GetModel(Convert.ToInt32(Request.QueryString["id"]));
行 22:                 n.Click += 1;
行 23:                 new NewsDal().Update(n);
行 24:                 FormView1.DataSource = new NewsDal().GetList("ID=@id", new SqlParameter[] { new SqlParameter("@id", n.ID) });

[NullReferenceException: 未将对象引用设置到对象的实例。]
   news_show.Page_Load(Object sender, EventArgs e) in d:\wwwroot\shezhang\wwwroot\WebUI\news_show.aspx.cs:22
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627