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I am using an ASP.net Website project in VB.net and have added a LINQ to SQL data class to it in order to use a number of LinqDataSource controls. Yesterday my project worked fine but after shutting down last night and starting up this morning I now get this error:

Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC30002: Type 'System.Data.Linq.Mapping.DatabaseAttribute' is not defined.

Source Error:

<Global.System.Data.Linq.Mapping.DatabaseAttribute(Name:="xxxx_pcf")>  _
Partial Public Class PCFDataContext
    Inherits System.Data.Linq.DataContext

This file is auto-generated by Visual Studio 2010 but it throws no errors. I only get the error at runtime.

Elsewhere on the internet people have recommended removing the Namespace declaration, only I don't have one.

I also found here somebody saying that the reference to System.Data.Linq might be missing from the web.config file. Not for me though, my web.config is ok.

Also here a warning about VS renaming your classes for pluralization reasons - again not valid for me.

So I am stuck.

Adi Lester
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rf_wilson
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  • So it gets stranger... I renamed one of the Data Classes and re-ran the site - it worked. As a test, I changed the name of the Data Class back to the original value - it still worked! Whats going on? – rf_wilson Aug 23 '12 at 09:55
  • This error re-occurred after deploying the site to the web server. There has to be a way to solve this - anyone? – rf_wilson Sep 12 '12 at 12:46

2 Answers2

6

I had the similar issue when I used LINQtoSQL(vb.net) in my website(.net 4.0 framework) for the first and rolled it out to the live server. It was working fine in my local server.

All I did is adding the below lines in my web.config

<page>
 <namespaces>
    <add namespace="System.Data.Linq" />
    <add namespace="System.Linq" />
 </namespaces>
</Page>
<system.web>
  <assemblies>
    <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
     <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
  </assemblies>
</system.web>

It worked for me,worth a try my friend...

Sriniwekh Ravindran
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  • This worked for me, but the structure is a little off. `` should be `` and it should be nested under ``. Also, `` should be nested under ``. – Jargs Aug 28 '17 at 18:43
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It looks like its a problem with VB only and C# does not face the same issue. Have a look here. Hope it helps

Divi
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