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chhean daravuth 1

Dear all

May you help me? I update my project from visual studio 2010 to 2012 and update report viewer from version 10.0.0.0 to 11.0.0.0
but i have issue with report viewer when i run project the below.

Error 4 The type 'Microsoft.Reporting.WebForms.ReportViewer' exists in both 'c:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll' and 'c:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\11.0.0.0__89845dcd8080cc91\Microsoft.ReportViewer.WebForms.DLL'

Can you tell me ? how to fix this problem?
I try remove reference ready but it still error.

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Answer 1

Tianyu Sun-MSFT 34,436 Microsoft External Staff

Hello @chhean daravuth ,

Thank you for taking time to post this issue in Microsoft Q&A forum.

Please right-click your project > click Unload Project > right-click it again > click Edit XXXX.XXproj and then check this .XXproj file, does this file include codes like:

<Reference Include="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=XXX, processorArchitecture=MSIL">  
      <SpecificVersion>False</SpecificVersion>  
      <HintPath>..\..\..\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0__XXXX\Microsoft.ReportViewer.WebForms.dll</HintPath>  
</Reference>  
<Reference Include="Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken= XXXX, processorArchitecture=MSIL">  
      <SpecificVersion>False</SpecificVersion>  
      <HintPath>..\..\..\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\11.0.0.0__ XXXX\Microsoft.ReportViewer.WebForms.dll</HintPath>  
</Reference>

If you can see two different versions of this WebForms.dll are referenced, please try to annotate the codes lines which are related to the older version of WebForms.dll and then reload the project(right-click your project > Reload Project), and rebuild the project again.

If this issue still persists, could you please share the related code snippets of the proj file(hide the privacy information and replace them with XXXX) with me for further check? Besides, did you perform some other operations when updating Report Viewer from 10.0.0.0 to 11.0.0.0?

Best Regards,
Tianyu

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chhean daravuth 1 Reputation point

2020-12-07T01:36:50.997+00:00

Hello TianyuSun-MSFT

My project is web application. when i right click on project why i can't see Unload Project
can you tell me about it ?
chhean daravuth 1 Reputation point

2020-12-07T03:46:07.307+00:00
chhean daravuth 1 Reputation point

2020-12-07T03:48:36.093+00:00

can i upload my project and check it for me?
because this project start develop with VS 2008 and upgrade 2010
and now i want to update VS 2012.
Tianyu Sun-MSFT 34,436 Reputation points Microsoft External Staff

2020-12-08T08:05:14.03+00:00

Hi @chhean daravuth , thank you for your feedback. Probably, the issue is caused by the “Upgrade” project to a higher version of VS. But from the screenshot you shared with me, it seems that there is no PROJECT option in the menu bar at the top of VS 2012. So did you just open the project by opening a website(as I can see that there is a WEBSITE option in the screenshot you shared)? If possible, please open the web project as a project(solution), and you will see the Unload Project option when right-clicking your project.

Anyway, you can also try to look for the .xxproj file directly in your solution folder. And open it with NotePad, then edit it(remember to make a backup).

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