The Name <...> Does Not Exist in the Namespace Clr-Namespace <...>

the name ... does not exist in the namespace clr-namespace ...

Every time it happend to me i just restarted visual studio, re-built the solution and it worked just fine.. can't say why

The name XYZ does not exist in the namespace clr-namespace:ABC

Your solution is running on a network share. .Net (and Visual Studio) applications can run into permission / access issues when running on a network share.

Copy your solution to a local drive (with full trust) and you should be fine.

It is possible to get a network drive working with full trust - you can find answers for this on StackOverflow and other places - but in my experience I keep running into obstacles when I do this, so try to avoid it unless it's absolutely critical to the problem at hand.

E.g. this question gives instructions about how to do this:

Give FullTrust to UNC share for Visual Studio 2012 and .Net 4.0

I've only ever tried this with VS2010 so (as indicated in the link) you might have better joy with 2012.

The name ' ' does not exist in the namespace ' '

This issue in my case was that the project, and the solution had spaces in, whilst the namespace in the code had underscores. Renaming the project and solution so they matched the code, after a clean and build, resolved the problem.

The name does not exist in the namespace clr-namespace:

Wrap your MainWindowViewModel class in

Namespace ViewModels
  Public Class MainWindowViewModel
  Inherits ViewModelBase
...
  End Class
End Namespace

And then add a new namespace to your window:

xmlns:vm="clr-namespace:Koala.ViewModels"

And use the vm prefix instead of local in your resources declaration.

WPF: The name does not exist in the namespace

One common solution to this known VS bug that you haven't specified as having tried is changing the build target platform.

1. If your current build target platform is x64, change to x86. If it's currently x86, change to x64.

2. Clean and Build solution for new target platform.

3. Change back to desired target platform and re-build.

The name does not exist in the namespace error in XAML

Your code should works well after you build the project, and it works well in my side using your above code. Try to clean your solution or delete the bin and obj folders in your project then rebuild your app again. Also try to restart your Visual Studio. If it still happens, you can provide a reproducible sample to help me look into this issue.

The name does not exist in the namespace in WPF application

I've solved the problem. The reason was that assembly name should be Sample.Common, not Sample.

The name ... does not exist in namespace .. Visual Studio 2017

I just figured it out. I removed the referance, right click on dll file and selected "Unblock File", added to the references and everyting is fine now.

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