Where you once usedRegsvr32On unmanaged com libraries, you will now useRegasmOn managed. Net libraries.
"Regsvr32 is the command-line tool that registers. DLL files as command components in the Registry"
Using regasm.exe, the Assembly registration tool that comes with. net SDK, reads the metadata within an assembly and adds the necessary entries to the Registry, which allows COM clients to create. net Framework classes transparently. once a class is registered, any COM Client can use it as though the class were a com class. the class is registered only once, when the Assembly is installed. instances of classes within the Assembly cannot be created from com until they are actually registered."
If you want to register an assembly programmatically, see the registrationservices class and comregisterfunctionattribute
Source: http://blogs.msdn.com/csharpfaq/archive/2004/08/02/206158.aspx