I have a C# windows service that need to handle the
SERVICE_CONTROL_DEVICEEVENT event.
This event is not supported by the ServiceBase class so I tried to use the
P/Invoke to call RegisterServiceCtrlHandlerEx() and register the call back

We want to set up ONE shared .NET server with VB.Net that
shall expose ONE shared singleton instance to all requests.
This instance has to be exposed to COM, too.
While it is no problem to access the server with .NET

I am trying to use excel as a maths engine in a VB.NET application.
I have managed to get the basic functionality I desire, but in doing so
have to open an existing workbook using the following code:
Function CalculateFromEXCEL() As Single

I am using VB.net to talk to a COM object. I have two
problems I am trying to solve.
1)  One of the COM public methods returns the standard
S_OK if all is well. It looks like this:

In my Windows application I use the following code:
"Try
 WordApp = New Word.ApplicationClass()
 WordDoc = WordApp.Documents.Open(txtWordDoc.Text)

I am trying to use a COM library from my .NET application.
I built .tlb from .idl file and run TlbImp.exe on .tlb to
produce an interoperability assembly. During conversion,
a number of warnings are issued:

I have a very large C++ library that I need to use in .NET, so I want to
create a C# wrapper around this library just like I have done for other C
style dlls. However, this C++ library has no C interface. The C++ library
has build options as a static lib and as a dll. Therefore, the ...

I am writing a file manager (in C#) which uses a dll which hooks into
the system sending my app a message when a window is created or
destroyed, the dll works fine and I am receiving the messages.
When I receive a Window Created message I want to get a handle on its

Hi Everyone -
I have two questions about MarshalAs
1)  I need to setup the correct MarshalAs for this  setup...
   [StructLayout(LayoutKind.Sequential)]

I am trying to embed microsoft word document window to a .NET form
applciation and could not find how to do that.
On VC6 it was quite easy to do it with Ole Container applciation but in .NET
I could not find anything regarding OLE documents/views etc.

I am trying to implement visual themes for a tab page in VB.NET, I have
derived a new tab page class to use the UXTheme.dll methods to draw visual
themes, but the problem I'm having is getting Groupboxes and checkboxes to
display correctly on the Tab Page, I have searched for ages ...

I have a managed class written in C# which fires events to an
unmanaged dispinterface sink. This setup is working fine, except when
I try to disconnect from the event source the reference count on the
sink is not released straight away and remains the same until the

I'm having an interop problem where my managed component is reentered from
COM on the wrong thread, at which point things seem to go downhill very
rapidly. I'm successfully making very heavy use of COM interop elsewhere in
my C# code, but I'm having trouble finding a way around this ...

i need to call unmanaged c++ code from c#.
Is it possible to do this direct, without dll's?
The DllImport gave me an error saying no enrty point. what
is the problem with that?

is there any chance to speed up the loading process of ActiveX
controls? I'm using the webbrowser control from VB.NET through interop
and the EndInit call to the ISupportInitialize interface costs about
12 seconds.