What is the best memory buffer size to allocate to download a file from Internet?

Question

What is the best memory buffer size to allocate to download a file from Internet? Some of the samples said that it should be 1K. Well, I need to know in general why is it? A

Answer 1

I have problem with remote machine closing connection when used 64K buffer when downloading from iis.

I solved the problem raising the buffer to 2M