Could not load file or assembly 'Microsoft.ReportViewer.WebForms'

Question

I am trying to use the report viewer in asp.net and have uploaded my site. However, when my page containing the report viewer is loaded, it shows the following error:

Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

This is my first time deploying an ASP.NET website, so I'm not sure what the problem is.

See this post : Could not load file or assembly Microsoft.ReportViewer.WebForms.XmlSerializers — Maryam Arshi
– Maryam Arshi, Commented May 11, 2013 at 4:43

Madis · Accepted Answer · 2020-02-17 14:52:52Z

68

This link gave me a clue that I didn't install a required update (my problemed concerned version nr, v11.0.0.0)

ReportViewer 2012 Update 'Gotcha' to be aware of

~~I installed the update SQLServer2008R2SP2~~

I downloaded ReportViewer.msi, which required to have installed Microsoft® System CLR Types for Microsoft® SQL Server® 2012 ^{(look halfway down the page for installer)}

In the GAC was now available WebForms v11.0.0.0 (C:\Windows\assembly\Microsoft.ReportViewer.WebForms v11.0.0.0 as well as Microsoft.ReportViewer.Common v11.0.0.0)

edited Feb 17, 2020 at 14:52

Madis

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answered Sep 5, 2013 at 12:05

EricG

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3 Comments

Mike D Over a year ago

also needed to restart the application pool before the newly installed dll's were picked up.

Matt Over a year ago

Update: Consider using NUGET - see section "Updating an existing project to use the ReportViewer control" in Microsoft article "Integrating Reporting Services Using ReportViewer Controls - Get Started". After updating it via NUGET check the "CopyLocal" setting (should be set to true).

Annie Lagang Over a year ago

Thanks. I needed to install Microsoft® System CLR Types first before I installed the ReportViewer.msi but after installing both my application now build properly. Thanks again.You can get the installer here: microsoft.com/en-ph/download/details.aspx?id=29065

Moses Machua · Accepted Answer · 2018-05-16 02:29:51Z

50

I've installed Microsoft.ReportViewer.2012.Runtime nuget package and problem has been solved without installing ReportViewer.msi or sql feature pack 12

edited May 16, 2018 at 2:29

Moses Machua

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answered Oct 8, 2015 at 11:07

Rami Yusf

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6 Comments

Killnine Over a year ago

This worked for me. I was in need to getting v12 .dlls on a build server (TeamCity) that only had v11 available. There's a 2015 release package available on NuGet

Shaiju T Over a year ago

this helped thanks , there are many authors in nuget which you can choose from but as suggested in answer i used package created by Author Fornax and here is link to install via nuget

MichaelMao Over a year ago

I think this answer save a day for me

PHBeagle Over a year ago

This worked for me, though I didn't specify the 2012.runtime. Instead I did "Install-Package Microsoft.Report.Viewer" in the Package Manager Console.

Matt Over a year ago

For version 11.0.0 I used that Microsoft.ReportViewer package which you can see in the results of the picture and there was no problem

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jmoreno · Accepted Answer · 2013-09-12 06:20:05Z

23

You need to reference both Microsoft.ReportViewer.WebForms and Microsoft.ReportViewer.Common and set the CopyLocal property to true. This will result in the dll's being copied to our bin directory (both are necessary).

answered Sep 12, 2013 at 6:20

jmoreno

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3 Comments

philreed Over a year ago

I followed the steps above and have referenced Microsoft.ReportViewer.WebForms (v11) but cannot locate Microsoft.ReportViewer.Common (v11). Any ideas why I cannot see the common library?

Matt Browne Over a year ago

I found Microsoft.ReportViewer.Common in C:\Windows\assembly\GAC_MSIL\..., thanks to this answer.

Resource Over a year ago

I installed ReportViewer as in a previous answer but that didn't work. This answer got me to a point where I was getting a new exception that told me to add ReportViewer to my web.config file. Once I fixed web.config I was sorted.

blackbishop · Accepted Answer · 2015-04-11 16:56:02Z

9

I've solved the problem by copying both

Microsoft.ReportViewer.WebForms.dll from C:\Program Files (x86)\Microsoft Visual Studio 12.0\ReportViewer
and Microsoft.reportviewer.common.dll from C:\Program Files\Microsoft Office\Office15\ADDINS\PowerPivot Excel Add-in

into bin folder (website).

Of course web.config must have:

    <httpHandlers>
        <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" validate="false" />
    </httpHandlers>

    <assemblies>

        <add assembly="Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91" />
        <add assembly="Microsoft.ReportViewer.Common, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91" />
    </assemblies>

    <buildProviders>
        <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </buildProviders>

    <system.webServer>
        <validation validateIntegratedModeConfiguration="false" />
        <handlers>
            <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
        </handlers>
    </system.webServer>

And that's all. For me is ok.

Hope this helps.

edited Apr 11, 2015 at 16:56

blackbishop

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answered Apr 11, 2015 at 16:00

CDSwSrl

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1 Comment

Kiquenet Over a year ago

validate="false", system.webServer validation validateIntegratedModeConfiguration="false" and preCondition="integratedMode" are required ?

mirzapinku · Accepted Answer · 2019-03-17 07:06:14Z

2

Updating ReportViewer should works. Use below instruction to install updated ReportViewer from Nuget Package Manager console.

Install-Package Microsoft.ReportingServices.ReportViewerControl.WebForms

Just add below assembly reference in your aspx file.

Here, 15.0.0.0 is the version number of the ReportViewerControl.WebForms that was installed in my VS. Please check Reference of the Solution to confirm the version number. No need to add PublicTokens (if multiple installation exists, it may creates trouble again).

answered Mar 17, 2019 at 7:06

mirzapinku

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Comments

user3657646 · Accepted Answer · 2014-05-20 17:05:00Z

1

I ran into the same error. My web app was pointed towards report viewer version 10.0 however if 11.0 is installed it adds a redirect in the 10.0 .dll to 11.0. This became an issue when 11.0 was uninstalled as this does not correct the redirect in the 10.0 .dll. The fix in my case was to simply uninstall and reinstall 10.0.

answered May 20, 2014 at 17:05

user3657646

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Comments

Steve Greene · Accepted Answer · 2016-02-22 14:34:52Z

1

I had this error with an old webforms app. Turns out there was a line in the markup causing the issue. I removed it and the error disappeared.

<%@ Register assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" namespace="Microsoft.Reporting.WebForms" tagprefix="rsweb" %>

answered Feb 22, 2016 at 14:34

Steve Greene

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2 Comments

tnk479 Over a year ago

So, that is simply not necessary anymore?

Steve Greene Over a year ago

@tnk479 Well, nothing simple about ReportViewer :) but that did it for me.

GunnarS · Accepted Answer · 2016-10-20 12:35:36Z

1

I had this error when going from version 10.0.0.0, i.e. "Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

to version 11.0.0.0, i.e.

"Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"

It took a while until I understood that not only the version was changed but also the public token key, as you can see above.

answered Oct 20, 2016 at 12:35

GunnarS

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Comments

Tar · Accepted Answer · 2017-06-03 22:47:12Z

1

I had the same error for a different package. My problem was that a dependent project was referencing a different version. I changed them to be the same version and all was good.

answered Jun 3, 2017 at 22:47

Tar

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Comments

Hamlet Mendez · Accepted Answer · 2017-12-12 13:37:36Z

1

My solution is:

Copy dll Microsoft.ReportViewer.WebForms.dll into Bin folder in your project.
Remove your reference.
Add new reference from bin folder.

I hope this can help.

answered Dec 12, 2017 at 13:37

Hamlet Mendez

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Comments

Amit Mittal · Accepted Answer · 2013-05-11 04:48:24Z

0

Upload the file Microsoft.ReportViewer.WebForms.dll to your bin directory of your web applicaion.

You can find this dll file in the bin directory of your local web application.

answered May 11, 2013 at 4:48

Amit Mittal

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2 Comments

Krishna Over a year ago

hey thanks @Amit Mittal , I already have added reference to Microsoft.ReportViewer.WebForms.dll, as wel as to Microsoft.ReportViewer.Common.dll

Amit Mittal Over a year ago

Since you are getting error after uploading, this means that the report viewer dlls are not installed at the sserver. That is why you have to either install report viewer controls as server or manually upload dll files to the bin directory.

Lutaaya Huzaifah Idris · Accepted Answer · 2018-05-24 09:15:28Z

0

My trial version of DevExpress had expired. Try renewing it again.

answered May 24, 2018 at 9:15

Lutaaya Huzaifah Idris

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Hemal Shah · Accepted Answer · 2019-06-13 09:51:27Z

In order to Run Report Viewer On server with Data from Server

A) Go to Project Property ----> Select Reference ------> Add Reference

1) Import (Microsoft.ReportViewer.Common.dll)-----> (Path "C:\Program Files (x86)\Microsoft Visual Studio 10.0\ReportViewer")

2) Import (Microsoft.ReportViewer.ProcessingObjectModel.dll) -----> (Path "C:\Windows\Assembly\GAC_MSIL\Microsoft.ReportViewer.ProcessingObjectModel")

3) Import (Microsoft.ReportViewer.WebForms.dll)-----> (Path "C:\Program Files (x86)\Microsoft Visual Studio 10.0\ReportViewer")

B) In Above three DLL set its "Local Copy" to True so that while Building Deployment Package it will getcopied to "Bin" folder.

C) Publish the Solution

D) After that Upload all the files along with "Bin" folder with the help of "File Zilla" software to "Web Server".

E) This will install DLL on server hence, client is not required to have "Report Viewer.dll".

This worked for me.

Guven Ozkurt · Accepted Answer · 2023-01-09 11:52:01Z

0

I had the same problem.

I fixed the problem by installing Microsoft-Report-Viewer-2010-Redistributable ("ReportViewer.exe)

answered Jan 9, 2023 at 11:52

Guven Ozkurt

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Korir Cornelius · Accepted Answer · 2023-09-26 08:54:04Z

0

You are missing Microsoft-Report-Viewer-2010-Redistributable in your server. Download it and install

answered Sep 26, 2023 at 8:54

Korir Cornelius

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