How to Register / UnRegister a C# COM Exposed DLL manually an with VS 2008

To Register a C# COM Exposed Dll you I reccomend to create a Register.Bat file with the following instruction

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REM Set the search directories
path=%path%;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319;C:\Program Files\Microsoft.NET\SDK\v1.1\Bin;C:\Program Files\Microsoft.NET\SDK\v1.1\Bin;C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322;

REM we first Unregister the .NET dll and then register it
regasm.exe /u "FullPath\MyLibrary.dll" /tlb
regasm.exe /codebase  "FullPath\MyLibrary.dll" /tlb
pause

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This insturction set the search path for the regasm.exe file. I have included the most common directory that should have it

path=%path%; .......

This line unregister the Dll and its typelibrary

regasm.exe /u "FullPath\MyLibrary.dll" /tlb


This one creates the type library and register the dll with its full Path and along the type library.
If you do not use the /codebase option VB will complain that it cannot find the library.

regasm.exe /codebase  "FullPath\MyLibrary.dll" /tlb

 To unregister make an unregister.bat file
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REM Set the search directories
path=%path%;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319;C:\Program Files\Microsoft.NET\SDK\v1.1\Bin;C:\Program Files\Microsoft.NET\SDK\v1.1\Bin;C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322;

REM we Unregister the .NET dll
regasm.exe /u "FullPath\MyLibrary.dll" /tlb

pause

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When you use the  code base option you need to have a strongly type Assembly (Dll) To do this
follow these steps

Go to Properties/Signing. Tick Sign the assembly check box.
Then go to Choose a stroing name key file
Choose a name  ex   "MyLibrary_COM_Key"
This will create a MyLibray_COM_Key.snk file in the project folder.

Lastly you also need to make sure that the Assembly Version is not someting like 1.0.* which means that each time you rebuild the project the assembly name changes. Just give the assembly a version, something like 1.0.0.0 and stick with it. The call to the COM exposed DLL is also connected to the assembly version registered in the registry.