Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 12:     <meta name="Keywords" content="<%=model.SuggestTitle %>" />
Line 13:     <meta name="Author" content="广元市交通运输局" />
Line 14:     <meta name="Description" content=" <%=model.SuggestResult.DosRemoveHtml().DosSubString(50) %>" />
Line 15:     <link href="/css/questionnaires.css" rel="stylesheet" />
Line 16:     <link href="/css/collect.css" rel="stylesheet" />

Source File: c:\wwwroot\CNGY_JTJ\CollectResult.aspx    Line: 14

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Dos.Common.Helper.StringHelper.SubString(String str, Int32 length) +105
   Dos.Common.CommonExpand.DosSubString(String str, Int32 length) +57
   ASP.collectresult_aspx.__RenderContent1(HtmlTextWriter __w, Control parameterContainer) in c:\wwwroot\CNGY_JTJ\CollectResult.aspx:14
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +149
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +149
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +149
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5362


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34209