Web Forms :: Web Application Form Error On Postback

May 9, 2010

I have recently upgraded a .net 1 web application to .net 2.0. Everything works fine except some of the administrator pages. These pages load ok but on postback they give the following error:

Type 'WebModules.Accounts.Business.SiteIdentity' in assembly 'test20, Version=1.0.3777.35197, Culture=neutral, PublicKeyToken=null' is not marked as serializable.
Stack Trace:

[Code]....

[SerializationException: Type 'WebModules.Accounts.Business.SiteIdentity' in assembly 'test20, Version=1.0.3777.35197, Culture=neutral, PublicKeyToken=null' is not marked as serializable.] Microsoft.VisualStudio.WebHost.Connection.ReadRequestBytes(Int32 maxBytes) +0 Microsoft.VisualStudio.WebHost.Request.ReadEntityBody(Byte[] buffer, Int32 size) +86 System.Web.HttpRequest.GetEntireRawContent() +8766749 System.Web.HttpRequest.GetMultipartContent() +62 System.Web.HttpRequest.FillInFormCollection() +168 System.Web.HttpRequest.get_Form() +68 System.Web.HttpRequest.get_HasForm() +8722023 System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97 System.Web.UI.Page.DeterminePostBackMode() +63 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +133

This happens only on my local machine. On the remote server it works fine. The problem also happens before the Page_load method is called (I have tried to debug).This is definitely not a problem of my code; it must be a .Net problem. I have narrowed down the problem of a particular page to the data binding of a datagrid. If I comment it out, the page works (the datagrid contents are not displayed of course). I have found on msdn that one of their security fixes causes this problem to occur in .Net 2.0, but the fix is for Vista. I am running XP so there must be something similar to XP.

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[Code]....

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