I am *not* missing an assembly or reference

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I'm using Visual Studio 2013, and I'm getting an error in my C# code that I can't figure out. I'm working with the Microsoft Kinect SDK, but I'll keep it general.

I downloaded the SDK, and I can get the included sample programs to build and run. But when I try to use the code in my own project, I get the

Type or namespace name 'Kinect' does not exist in the namespace 'Microsoft' (Are you missing an assembly reference)

error.

The thing is, I'm not missing an assembly or reference. I have it added to the project's references, and the path is valid. Also, the using statements at the top of the file will autocomplete to "Kinect" for me. If I start typing using Microsoft., Kinect will appear as an autocomplete option.

What are the steps to debugging an error such as this? Could it be a 32/64 bit issue? I tried using Dependency Walker to look at the Kinect DLL, and while it throws some errors (Error: Modules with different CPU types were found.), it doesn't show any issues that I don't see with other DLLs that I'm using successfully.

What are some other potential issues that might cause a problem with DLLs not being recognized?

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Daniel Möller On BEST ANSWER

1 - Try going to your project settings and verify the version of the .NET framework it uses.

The best to do is to choose the same version as the external libraries.
If it's a client profile, it will very often bring that exact problem. (I'm not sure what the client profile is, but I ended up never using it...)

2 - Check if any of your references got an exclamation mark.