could not load file or assembly ASP_WEB_... in ASP.NET 2.0

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Two days ago, I built an ASP.NET 2.0 application and published it on a
shared IIS 6 Web server. After publishing, and during the whole day, it
worked fine.

The server remained untouched since. Today, I wanted to access the home
page of the application again with a browser. But instead of the proper
page, I just got an ugly message:

Server Error in '/' Application.

Could not load file or assembly 'App_Web_rsznkzdo, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null' or one of its dependencies. The
system cannot find the file specified.

the stack trace reads as follows:
[FileNotFoundException: Could not load file or assembly
'App_Web_rsznkzdo, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null' or one of its dependencies. The system cannot find
the file specified.]
ASP.usercontrols_nav_ascx.__BuildControlTree(usercontrols_nav_ascx
__ctrl) +0
ASP.usercontrols_nav_ascx.FrameworkInitialize() +21
System.Web.UI.UserControl.InitializeAsUserControlInternal() +31
System.Web.UI.UserControl.InitializeAsUserControl(Page page) +14
ASP.catalog_main_aspx.__BuildControln1() +53
ASP.catalog_main_aspx.__BuildControll(Control __ctrl) +51
System.Web.UI.CompiledTemplateBuilder.InstantiateIn(Control
container) +12
ASP.masterpages_3col_master.__BuildControll() +105
ASP.masterpages_3col_master.__BuildControlf() +118

ASP.masterpages_3col_master.__BuildControlTree(masterpages_3col_master
__ctrl) +136
ASP.masterpages_3col_master.FrameworkInitialize() +45
System.Web.UI.UserControl.InitializeAsUserControlInternal() +31
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner,
HttpContext context, VirtualPath masterPageFile, IDictionary
contentTemplateCollection) +1978544
System.Web.UI.Page.get_Master() +48
System.Web.UI.Page.ApplyMasterPage() +18
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+543

Version Information: Microsoft .NET Framework Version:2.0.50727.42;
ASP.NET Version:2.0.50727.42


It seems to me like somehow ASP.NET disposed the generated assemblies
in the meantime. Please notice that this application was published by
XCOPY over FTP, that means it is not a precompiled app or something
like this.

How can that happen? I know that I could probably resolve the problem
with restarting IIS, but since I am not the ISP hosting this site, it
is not in my power. Anyway, I think this is a real bug, since I cannot
tell my ISP to just restart the IIS process every now and then. Does
anyone has an idea what is happening here?

Thanks for any help
Urs

.

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