When I run a application which uses MSComm control on a PC, it gives me
a unhandled exception as following.
"Class is not licensed for use"
I don't know what to do in order to handle it error. Could anyone kindly

I wrote mailing service code for my Windows Application.  When I was trying
to send a mail thru my application, an Error occurs only for Windows NT
saying that "Could not create 'CDONTS.NewMail' object".  It works fine with
Windows 2000 and Windows XP. Could some one pls help to get ...

I can instantiate a COM object in VC# without any problem.
But when i call one function exported by the COM object i
get this exception.
System.Runtime.interopservices.COMException 0x80010105

I have seen and used examples of InvokeMember on a Type
object to invoke methods on a VB ActiveX object and found
it to work OK.
I understand that when supplying an output parameter a

I've got a Managed C++ class that's being called from C#, and the C# code
needs to look like this :
byte * p = myManagedCppClassInstance.AllocateDmaBuffer(1000) ;
// Do various things, then ...

I would just like to know if a recent version of an Office Primary InterOp
Assembly [PIA] (for example, a PIA for Office 2003) is backward compatible.
So even if the MS Office installed on a workstation is Office 2000, my .net
winform app can properly interface with Office ...

I trying to document the PIA my company is shipping with our software and I'm having trouble explaining some of the characteristics of tlbimp.  I'm not sure why my classes get a 'Class' suffic and one of the interfaces gets elevated to what looks like the class.  For example, I ...

I must use the ax web browser control in a windows forms c# application;
this application should show some locally generated HTML pages with some
text and tables, and react to browser events such as hovering the mouse onto
some elements, clicking some elements, etc. In response to ...

What is the simplest way to declare a cdecl delegate in managed C++? Jan
Kotas' post from a while ago seems to indicate that it is possible, but I am
having a bit of trouble figuring it out.
I am trying to wrapper a library (HOOPS) that uses cdecl callbacks, and my

I m facing a problem while calling a VB COM DLL function that returns
a Struct from C#. Actually My struct contains another array of struct
in it and get a MEmeory Exception when I try to return that structure
to C# program. I write a sample program to test this :

I have tried to print pdf by using gswin32 and call it through the process
class
but I can't change the paper orientation....no matter I have set dORIENT1 =
true / false...it is printed as portrait....

I want to call Win32 APIs from C#. I was trying the Networking APIs like
NetUserEnum, NetShareEnum etc. These APIs have a pointer to buffer as a
parameter. Based on the following article
         http://www.csharphelp.com/archives/archive63.html

  I have created an interface called IGlobal with some
properties exposed with a fixed Guid. Created a class
inherting this interface. This is my com+ server. I have a
client instantiating this object with prog id. I made a

It seems that "ParameterModifier" play an important role
in some case,such as in "Type.InvokeMember",but how to
understand "ParameterModifier" and how to use it?
Some sample code is expected.

   Using Type.InvokeMember to call a method of a class
in COM dll,the method has a reference parameter,It  seems
that there is no way to return the changed value of that
reference parameter by the method of the class.