Return Value

The method returns a structure that contains the image source's data as it is natively stored by the particular image source type. For encoded image sources the structure contains a byte array with encoded data, for NRaster-based image sources it contains a NRaster.
The method doesn't throw exceptions, but it is possible that it doesn't return any valid data. In this case you can check the DataException property for a possible exception that may have occured during data retrieval.

Reference

NImageSource Class
NImageSource Members