Hello devchander. LabVIEW has some excellent example programs. You can access them by opening up LabVIEW, clicking Help from the menu, and selecting Find Examples. There is one titled "Cont Acq&Chart (buffered).vi" (Browse: Hardware Input and Output>>Traditional DAQ>>Analog Input>>General) that performs continuous acquisition. If you would like to acquire multiple channels you should type "0:4,5:15" in the channels(0) input.
Marni Schwartz
National Instruments