interop

I know the basic difference as ReleaseComObject only decreases some counter by one and FinalReleaseComObject decreases it to zero. So what I usually hear is, call FinalReleaseComObject because then you are sure that the COM object is really released. But this makes me wonder, there is a point to this counter right? Aren't you breaking that mechanism if you always call FinalReleaseComObject . If that counter is not one before you call ReleaseComObject , is there not probably a reason for it? What could cause it to be higher than one when it should not be? Thanks in advance. PS: My COM

I understand that there are several ways to blend XNA and WPF within the same application. I find it enticing to use WPF for all GUI and HUD stuff in my XNA games. Does anyone have any practical experience on how well this approach works in real life using .NET 3.5 SP1 ? Any pitfalls (such as the "airspace problem" )? Any hint on what appoach works best? Kris Erickson There is an addition in 3.5 SP1 that allows better interaction between DirectX and WPF (D3DImage), and one way to get to that is through XNA. Here are some details: http://jmorrill.hjtcentral.com/Default.aspx?tabid=428&EntryID

Here is a C# program that tries Marshal.SizeOf on a few different types: using System; using System.Runtime.InteropServices; [StructLayout(LayoutKind.Sequential)] class AClass { } [StructLayout(LayoutKind.Sequential)] struct AStruct { } [StructLayout(LayoutKind.Sequential)] class B { AClass value; } [StructLayout(LayoutKind.Sequential)] class C<T> { T value; } class Program { static void M(object o) { Console.WriteLine(Marshal.SizeOf(o)); } static void Main() { M(new AClass()); M(new AStruct()); M(new B()); M(new C<AStruct>()); M(new C<AClass>()); } } The first four calls to M() succeed, but

I have a need to copy a worksheet from one workbook into another and I'm a bit stuck. The premise is that I have a "master" workbook that stores the templates for a number of reports and I then need to create a blank copy of a specific worksheet and add it into a new workbook. This is what I have so far: private void CreateNewWorkbook(Tables table) { Excel.Application app = null; Excel.Workbook book = null; Excel.Worksheet sheet = null; try { string startPath = System.IO.Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName); string filePath = System.IO.Path