Preallocating file space in C#?

Question

I am creating a downloading application and I wish to preallocate room on the harddrive for the files before they are actually downloaded as they could potentially be rather lar

Answer 1

If you have to create the file, I think that you can probably do something like this:

using (FileStream outFile = System.IO.File.Create(filename))
{
    outFile.Seek(-1, SeekOrigin.Begin);
    OutFile.WriteByte(0);
}

Where length_to_write would be the size in bytes of the file to write. I'm not sure that I have the C# syntax correct (not on a computer to test), but I've done similar things in C++ in the past and it's worked.