File.Copy vs. Manual FileStream.Write For Copying File

Question

My problem is in regards file copying performance. We have a media management system that requires a lot of moving files around on the file system to different locations inc

Answer 1

Dusting off reflector we can see that File.Copy actually calls the Win32 API:

if (!Win32Native.CopyFile(fullPathInternal, dst, !overwrite))

Which resolves to

[DllImport("kernel32.dll", CharSet=CharSet.Auto, SetLastError=true)]
internal static extern bool CopyFile(string src, string dst, bool failIfExists);

And here is the documentation for CopyFile