static public void CopyFile(this FileSystem FileSystem, String SourcePath, String DestinationPath)
{
using (var SourceStream = FileSystem.OpenFile(SourcePath, FileMode.Open))
{
using (var DestinationStream = FileSystem.OpenFile(DestinationPath, FileMode.Create))
{
SourceStream.CopyToFast(DestinationStream);
}
}
}