C# sample application to capture from GeoVision DVR card

I'm looking for a sample C# application from you that finds and connects to a DVR capture card. The target platform is Windows 7. The sample application should be in C#. The capture card is recognized as a DVR card not a Video Capture card by Windows Device Manager. The specific card I will be using is from GeoVision but any DVR card should work. I currently have an application that uses Direct Show to connect to an out of production Video Capture card. As far as I can tell the Direct Show interface does not recognize DVR type cards. There is also some question about Windows 7 support for Direct Show. Your sample should recognize the newer DVR capture cards, connect to it, discover all the available video sources(4,8 or 16 channels of video are common with these cards) then provide an interface to stream video to a canvas or picturebox control. I have spent several months trying to find sample code that accomplish this task and have discovered there are a lot of people with Direct Show experience who think this is a simple task. They all point to various sample Direct Show applications that work only with video capture cards. Not with DVR capture cards. If you have the knowledge to provide me with a sample C# application that performs the task described above then you are who I'm looking for.