Could not load file or assembly Microsoft.ReportViewer.WebForms or one of its dependencies

Question

When I goto my site I get this error...

Error   101 Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. C:\mlui\csharp\WebAdmin_solution\WebAdmin\web.config    209

which is this line of code:

<add assembly="Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />

I am using Visual Studio 2012, do I need to download something and add it to the VS 2012 folder?

Wharfage

Answer 1

If you're actually using the Reporting Services, try to install the Reporting Services redistributable on the server you deploy your web site to or include the required assemblies with your web application.

Jackstay

Do you have a link where I can download it? – Wharfage

How would I include the required assembiles to my web application? – Wharfage

It should be on your development machine already, but you can try this: microsoft.com/en-us/download/details.aspx?id=3841 – Jackstay

Well, there must be a reference to the assemblies in your project - can you set the "Local copy" property to true in the reference's properties? Then the DLLs should be copied to the output folder. At least this is the case for desktop projects... – Jackstay

Answer 2

Right Click on the Project and open and go to Manage NuGet Package

Under browse tap search for Microsoft.Reporting.WebForms

select Microsoft.ReportView.Webforms

and click install.

• so it will take care of respective dependency and so on,

Sartain

Answer 3

Look at your folder instalation, what version have the folder ReportViewer. And put Version=X.0.0.0 where X means the version of your instalation.

In my case, I have

But only inside 10.0 I have the ReportViewer

And my web.xml is like this

<assemblies>
                <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                <add assembly="Microsoft.ReportViewer.WinForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>
    <buildProviders>
                <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
            </buildProviders>

Tippets

thanks guys.. i've got the idea that maybe there is no installed reportviewer in that server.. so i download a separate installer for reportviewer for vs2010.. and it works!! – Joyann

Answer 4

try to update it with latest assembly of version 10.0 by add reference to your project and build it again after adding assembly file will looks something like below

Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

Discordancy

Answer 5

Just Search Microsoft report viewer in internet you will get exe file , install it, Issue will resolved

Hallvard