“/”应用程序中的服务器错误。

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行 56:             strPath = clientcolumnname.Path;
行 57:             string strType = null;
行 58:             if (strPath.Length >= 3)
行 59:             {
行 60:                 strType = strPath.Substring(strPath.Length - 3, 3);

[NullReferenceException: 未将对象引用设置到对象的实例。]
   NewsDetail.Page_Load(Object sender, EventArgs e) in c:\wwwroot\xunjikj\wwwroot\NewsDetail.aspx.cs:58
   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