How to transfer huge files with FtpWebRequest

In general if you encounter huge files, more than 2GB, if you want to read into the array as a small file, you will certainly encounter the problem of exceeding the 2GB limit, 64-bit operating system has the same problem.
What to do with the stream to solve, whether it is read or write with stream, read a dozens of K at a time, write a dozens of k, in the loop repeatedly read and write,
There was a getrequeststream () in the FtpWebRequest, and the stream was written back and forth, and it was done.

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How to transfer huge files with FtpWebRequest