Can I use COM components from .NET programs?

I would second the replies from ImranKhan and Vikash. I would like to add to it that do take care about the clean up of a COM resourse. I mean COM resources are unmanaged so you have to do a proper cleanup of them and this depends upon the COM component you are using.

Yes you can,

In MS Visual Studio you can add it to your .NET project. First you need to create a reference of COM component in your project.

1) Open Solution Explorer of your porject.

2) Go to your project and right click on it.

3) Click on Add reference and go to COM component.

4) Click on the component you want to add and press ok.

a reference will be created for the COM component. Now you can use this COM component in your project.

Yes.

COM components are accessed from the .NET runtime via a Runtime Callable Wrapper (RCW). This wrapper turns the COM interfaces exposed by the COM component into .NET-compatible interfaces. For oleautomation interfaces, the RCW can be generated automatically from a type library. For non-oleautomation interfaces, it may be necessary to develop a custom RCW which manually maps the types exposed by the COM interface to .NET-compatible types.