John,
You may already have one for C#. If you have the NI VISA drivers installed, you should get examples in the ...\National Instruments\MeasurementStudioVS2003\DotNET\Examples folder. I went ahead and still attached a zip file with the VISA SimpleReadWrite example in C#. I would suggest trying to use the C# version, because you will be able to use the full .NET capabilites. Although Measurement Studio does support C++ in .NET, it only supports the MFC versions, meaning you will not have full access to the .NET framework. Hopefully this helps you out, but if you have more questions, feel free to repost. Thanks and have a great day.
Adam B.
Applications Engineer
National Instruments