can we Mix vb.net and managed C++ codes !!

Hi,
I converted my old C++ code to managed C++ code some time back .. and now i need to integrate this code along with another code that has been written in vb.net .. I wanted to know if this can be done .. i've been trying this for some time now but when i include my managed c++ project into my vb.net project and try to include the  workspace in the vb.net project .. it says that the workspace with such and such name does not exist. .on going to the configuration manager in the debug menu i found that the managed c++ code was on win32 platfom while the vb.net code is on .NET platform .. does that make a difference ..
also while adding the managed c++ project in the references I get an error A reference to Managedcode cannot be added. An assembly should have a .dll extension in order to be referenced ..
does this mean that the managed c++ code cannot be mixed with the vb.net code?

regards.