“/”应用程序中的服务器错误。

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行 47:             strPath = clientcolumnname.Path;
行 48:             string strType = null;
行 49:             if (strPath.Length >= 3)
行 50:             {
行 51:                 strType = strPath.Substring(strPath.Length - 3, 3);

[NullReferenceException: 未将对象引用设置到对象的实例。]
   pro.Page_Load(Object sender, EventArgs e) in c:\wwwroot\bangnongda\wwwroot\pro.aspx.cs:49
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693