“/”应用程序中的服务器错误。

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行 4:      DataClassesDataContext dl = new DataClassesDataContext();
行 5:      var ns = getClassList.get(id);
行 6:      Page.Title = (ns.STitle != null && ns.STitle != "" ? ns.STitle : ns.Title) + " - " + getWebsite.get(ns.WID).Title;
行 7:      Page.nskey = ns.SKeys != null && ns.SKeys != "" ? ns.SKeys : "";
行 8:      Page.nsdes = ns.SDes != null && ns.SDes != "" ? ns.SDes : "";

[NullReferenceException: 未将对象引用设置到对象的实例。]
   ASP._Page_about_cshtml.Execute() in c:\web\bescn.com2022\web20220308\about.cshtml:6
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
   System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +98
   System.Web.WebPages.WebPage.ExecutePageHierarchy() +184
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +106
   System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContextBase httpContext) +141