We've got hunderdes of installs of varying sizes of our software over
the years that have never reported a problem, but we've got a single
high-profile customer reporting that our software is crashing with:
System.NullReferenceException: Object reference not set to an instance

Can some one please point me to some sample code of using c# (.net 2 or 3x)
hosting internet explorer?
The target application is to run on XP or vista.
I am thinking of building an c# application to automate some tasks surfing

I am facing problem when i am converting C#.net code(Delegate concept)
into vb.net. I am unable to do that . Can someone help me to solve the
problem. I am providing my C#.net code.
==================================my code is :-

I would like to know what Microsoft product(s) would be could used for the
following results and what the price
of the recommended product would be:
I work for a small company that would like to keep track of the following:

I have found some sample code for how to do this on the site:
http://blogs.microsoft.co.il/blogs/eyal/
This seems to work for the Word preview handler but the adobe one fails to
load with exception:

Though it doesn't say it explicitly, I have been assuming
Marshal.GetComInterfaceForObject pins the object you call it on. By
that I mean that until you call Marshal.Release the returned IntPtr
should have the same value and it's safe to cache it in native code.

This group has been inactive so long, I wonder if I'll get a response but
here goes...
Am trying to troubleshoot an Interop issue where an INVALID STATE is being
returned by way of "EXCEPTION HAS BEEN THROWN BY THE TARGET OF AN INVOCATION"

I need a reliable and effcient way to connect two modules one writen in
native C++ code and the second written in C# as a WCF service.
The connection should be bidirectional connection.
What is the best way ?

I want to create a COM Server in .Net (C#),  a separate windows service that
will do some work own its own and provide services to C++ clients.
how can it be done?
Lalit

i have written an ActiveX Control in C#, registered it with COM and
can use it without any problems in VB6 and VBA. My problem is: the
Class assistant in Visual C++ 6 uses "_Object" as type for a member
variable for this control instead of my explicit declared Interface.

I have an ASP.NET web site that creates Excel reports using
Microsoft.Office.Interop.Excel version 11.0.0.0.  When the user clicks
a CreateReport button, an Excel application is created and disposed of
in the button click event as below:

I and am implementing Scott Swigart's MSDN solution detailed in
http://msdn2.microsoft.com/en-us/library/aa719109.aspx.  It details how to
leverage the .Net 2.0 BackgroundWorker component via interop from a VB6
application.

I'm using VS2005 and trying to create a very simple UserControl to be
used in IE:
using System;
using System.Drawing;

I'm trying to call a dll function from C# which has the following form:
   int some_function(int count, char **arg1, char **arg2)
Which parameter type I need to use in C# for C++ char** type? I tried
byte[][] (array of byte[]) but I get error "There is no marshaling support

I would like to use the C++ interface IProvisioningProfileWireless
in .Net 1.1.
I came so far:
[ComImport]