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How do I call windows form c# functions from c++ project?

I was working on a windows form project lately and I made some functions in that project that I want to use from another c++ project of mine. My windows form project is creating a .dll already, so I was wondering if I could call my functions thanks to it somehow.
I tried creating a CLR empty project as I know those are supposed to link C++ and C# possible but when I try to use the namespace of my C# classes in the CLR project, visual doesn't find it and tells me the name I'm trying to use must be a namespace, am I missing something?
Here are some images of what I've done:
Encrypter.cs (the C# class I'm trying to use)
The C++ file in the CLR project trying to use it (I tried several ways of getting my class, I left them all, none worked)
Both projects are next to each other in the same solution.
To sum up my questions:
Do CLR projects work both ways with C++ and C#? I find very few mentions of C++ projects using C# functions, but much more of the other way around.
Is it possible to call windows from C# functions from a C++ or CLR project, or do I have to make another C# project that creates a .dll ?
If I'm going the right way with what I've already done, how do I use my C# class in my CLR project?
EDIT: For anyone maybe coming through here, I found the solution. Turns out I did miss something in my setup, when selecting the CLR project and going in the "Project" menu on top of visual studio, you can then go to "Add Reference" and select your C# dll. Once I did this, the CLR project saw all my C# classes and functions.

C# Code in C++ Project

I've read many solutions to the issue of using C# code in a C++ project, including this one: How to use c# code in C++ project
I've also read this, and one answerer says Compile your C++ code with the /clr flag. With that, you can call into any .NET code with relative ease.
Does this mean that I can use C++ & C# code together, within the same project if I append the /clr flag?
I'm a little confused by this, and it'll just waste time if I went the long route of converting the C# project that I'm trying to use parts of to C++, if doing so isn't actually needed.
Basically, I answered my own question on a different topic a couple of days ago without realising that the actual code of the sample project is C#:
Obtaining Current Network Rate
Can anybody give me a firm clarification to whether I understand this correctly (that I can use C# code in a C++ project with no issues, apart from the /clr switch being required)?
I'm not sure if SO is the right place to ask a question like this, so please tell me if it isn't instead of downvoting with no explanation.
Thanks.
Edit
Forgot to mention that this is a C++/CLI gameserver application DLL on Windows. If it matters, it is used on only Windows Server 2008 R2 and Windows 7.

If you use C++/CLI, then you can add references to other .net assemblies, but you do not mix C++ and C# code in the same project. What you would do is to create a new project (or add an existing one) in your solution using C#, and then add a reference to it in the C++/CLI project.
The drawback is that you need to marshal between C++ and .Net types (std::string vs System::String^), and you also need to learn the additional syntax used by C++/CLI (^, gcnew, etc.).
Further reading: Pure C++: Hello, C++/CLI

It means, that with the /clr switch, you can access assemblies (DLL or EXE) written for the .Net framework. Because such assemblies can be created with any .net language (including C#), you can use "code" written in C# from within C++, but it doesn't mean that you would be able to write C# in C++ project. Unfortunately - you can't.

You need to make a C++/CLI project in visual studio.
C++/CLI is a bit different to C++, because there is the managed stack, so memory is managed and you can avoid memory leaks (garbage collection).
Simply create a C++/CLI project and click on propietys and add a reference to your C# project, it should work :D
http://www.codeproject.com/KB/cs/ManagedCOM.aspx

Is there a way to stop the c# metadata from showing when navigating to a class or method in a VB.NET project from a C# project

So the scenario is this;
I have a VB.NET project and a C# project in the same VS2010 solution. The VB.NET project is referenced (and used) by the C# project as a project reference. If while I am in the C# project, and I Ctrl-Click or Go to Definition on an element that is part of the VB project, it takes me to C# generated metadata instead of the actual VB code file.
Is there any way to get this to go to the VB code file, so I dont have to navigate manually in solution explorer/navigator?

Currently there is no way to get "Goto Definition" to navigate between projects of different languages. The problem is not just limited to C# and VB.Net but extends to other managed languages like F# and C++/CLI. Each language sees the other as a DLL reference and hence you get metadata.
This is a known issue and something the language teams are well aware of. It's usually high on the list of potential items for future versions of Visual Studio

You could try (CTRL + comma) which is 'Navigate to' as a workaround?

How to call a dll file from c#

I am trying to call a dll file from c#
The dll file is made from a java application using ikvm and for now all the code does is print hello world.
How do i call the dll file in my c# code and is it possible to create an application in java that will return a boolean value to my c# code?
Thanks for your time.

I'm not sure I understand what you're trying to do, so apologies if I'm misreading. IKVM should translate your java code to a .NET dll or executable. After the "translation" you should be able to use the .dll more or less in the same way as you would with a "native" .NET code.
If your java application has a main method that prints "hello world" on the console, you should have converted it to a .NET executable (.exe) and not to a dll.
After converting it to a .exe (and assuming you're running it on Microsoft .NET on a windows system) you should just execute it.
As for the second part of your question, you can also create a dll (converted from java) that returns a boolean and consume it from a C# application.
See this tutorial for two examples of (pretty much exactly) what you're doing.

using System.Runtime.InteropServices;
You can then use
[DllImport("myjavadll.dll")]
Then add the dll as a reference by right clicking and navigating to it in the reference folder.
EDIT:
Here is a link that calls a C++ dll to C#. You may be able to work it out.
Call another languages DLL
EDIT: I have had issues adding DLLs as references and was forced to add as a resource. I believe this was because I was working with a sys32 dll.
Here is an old post by where I was trying to work out some DLL import errors. Maybe itll be helpful if you encounter some problems.
Old Post

Help creating a dll for a custom control

I'm going to ask a newbie question here. I need to use a control I found online in my code, but it was written in the wrong language. It is in C# and I am using VB.net for work. I have all of the code for the control which works beautifully in C#, but I had issues with it not working very well in VB.
The source code and a demo project are available here, but I am not sure exactly which files I should use to build the dll for VB.
It seems a lot to ask, but would someone mind taking a look and pointing me in the right direction?
Cheers

Add the project to your solution, or just build it using your version of Visual Studio. Then add a reference, either to the project in the first case, or the .dll in the second.
If the Control doesn't work well, it's not because it's written in C# as opposed to VB.Net.

You should be able to use/reference the DLL as-is from your visual basic solution. It doesn't matter whether it was written in C#, VB.NET or any other .net language.

One you compile a dll from the c# source it will work exactly the same as if it were written in vb. You simply need to create a reference to the dll in visual studio.