Could not load file or assembly crdb_adoplus.dll

For the following error:

Could not load file or assembly ‘file:///C:\Program Files\SAP BusinessObjects\SAP BusinessObjects Enterprise XI 4.0\win32_x86\dotnet1\crdb_adoplus.dll’ or one of its dependencies.

Is there any way to resolve this error other than through the solution:

<startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0"/>
</startup>

That solution not work in my application

Please use this code. It may be helpful for you.

<startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>

This is slightly different than you. For more details visit this link Crystal Report Viewer

Change the first line to work successfully

After you open a file "App.config" from Solution Explorer

Previous:

<startup> 

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup>

Current:

<startup useLegacyV2RuntimeActivationPolicy="true">

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup>

Use only

<startup useLegacyV2RuntimeActivationPolicy="true">
</startup>

It works for all frameworks!

This stuff basically happens, if you have correct setup of SBO (I wish you so:)), that between different components of your SBO SDK there are assemblies with different .NET version. Check if you have some old version of SAP BO SDK installed on your machine too. Hope this helps.

Try inserting the code below at your app.config or web.config file:

<startup useLegacyV2RuntimeActivationPolicy="true">
        <supportedRuntime version="v4.0"/>
</startup>

Do a clean install of Crystal Reports.

I had to uninstall all Crystal (Runtime and for Visual Studio) Then install only Crystal Reports for Visual Studio 2019 (SP26) At last I checked the checkbox for installing the runtime included in the "For Visual Studio" version.

When facing this issue in ASP.Net application, check the application pool of the application in IIS. Change the Application pool to .Net 4.0 from .Net 2.0.

It will fix the issue.

Follow steps: Right click on project then click properties ->compile ->Advance Compile Option -> click Target framework and select .Net Framework 3.5 -> Now Click OK

Thats the simple solution.