fileupload and memorystream

Hi:

I meet a problem when reconstructing a new memory from fileupload's postfile inputstream, 

like followings:

MemoryStream ms = new MemoryStream(this.fuload.FileBytes);

the main problem is, is the upper code snippet is the deepcopy of fuload's fileBytes; (fuload is a fileupload instance).

and how to clean the fuload.FileBytes, to make sure the ms is not build its stream by call by reference, instead, is the deepcopy

Thanks a lot.