Hi YHong,
Currently with Measurement Studio 8.0 you cannot use the DAQ Assistant in Visual Studio 2005 like you did in Visual Studio 2003. However, we do have a version of Measurement Studio that we are going to be releasing soon (within a month or two) that will provide full integration of Measurement Studio into the Visual Studio 2005 environment.
Hope this helps!
Best Regards,
Jonathan N.
National Instruments