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

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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

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

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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

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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        lt httpHandlers gt           lt 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    gt       lt  httpHandlers gt        lt assemblies gt            lt add assembly  Microsoft ReportViewer WebForms  Version 11 0 0 0  Culture neutral  PublicKeyToken 89845DCD8080CC91    gt           lt add assembly  Microsoft ReportViewer Common  Version 11 0 0 0  Culture neutral  PublicKeyToken 89845DCD8080CC91    gt       lt  assemblies gt        lt buildProviders gt           lt add extension   rdlc  type  Microsoft Reporting RdlBuildProvider  Microsoft ReportViewer WebForms  Version 11 0 0 0  Culture neutral  PublicKeyToken 89845dcd8080cc91    gt       lt  buildProviders gt        lt system webServer gt           lt validation validateIntegratedModeConfiguration  false    gt           lt handlers gt               lt 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    gt           lt  handlers gt       lt  system webServer gt    And that s all  For me is ok   Hope this helps

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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

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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

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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    lt    Register assembly  Microsoft ReportViewer WebForms  Version 10 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a  namespace  Microsoft Reporting WebForms  tagprefix  rsweb    gt

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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

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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

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My trial version of DevExpress had expired  Try renewing it again

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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

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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

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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

[asp.net] Could not load file or assembly 'Microsoft.ReportViewer.WebForms'

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