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I have a C# DLL project which has target Framework .NET Framework 4.5. It has a reference to external DLL my-external-dll written in C++ and built with MSBuild version (C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319). In Visual Studio, properties of my-external-dll shows Runtime Version as v4.0.30319.

Everything was working fine until recently we had some changes in the my-external-dll. New field was added to a structure.

I can see that new field in Visual Studio when I open my-external-dll in Object Browser. But when I run my application, it throws exception saying "Field not found" for the newly added field. I have cleaned the solution(bin folders of both DLL and my-external-dll) and rebuilt everything still same error. Even installed VS2017, still same error. It does not give any errors in the build or compilation. But throws exception runtime.

Have checked similar topics here which suggest cleaning solution and rebuilding but that doesn't help.

Please help.

Rakesh
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    There's a chance VS and runtime reads your external library from different locations. [This MS Docs page](https://learn.microsoft.com/en-us/dotnet/framework/deployment/how-the-runtime-locates-assemblies) explains how runtime locates assemblies. – Justinas Marozas Jan 31 '18 at 13:25
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    Visual Studio "refresh" options cannot help for problems such as these. The only way is to [manually review references](https://stackoverflow.com/a/35991676/) until the issue is found. – NightOwl888 Jan 31 '18 at 14:13
  • Did you only clean your solution or did you first remove the .dll from your project and then cleaned? – slow Jan 31 '18 at 15:32
  • I cleaned the solution. Also checked the GAC locations. C:\Windows\Microsoft.NET\assembly I don't see my dll there. – Rakesh Jan 31 '18 at 15:54

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