ASP.NET Overflow or underflow in the arithmetic operation when returning large file bigger 1 GB

Question

I went across some sort of limitation in ASP.NET. I reduced the problem into a sample project in ASP.NET MVC Project (created with Visual Studio 2010 and .NET 4) and the problem

Answer 1

Disable buffering in IIS will do the job:

public ActionResult DownloadBigFile()
{
    string file = @"C:\Temp\File.txt";
    var readStream = new FileStream(file, FileMode.Open, FileAccess.Read);
    Response.BufferOutput = false; //<-----
    return File(readStream, "text/plain", "FILE");
}

It really beats me why this is not the default ASP.Net MVC behavior when returning files. Especially when doing it with streams.

• Related thread in forums.iis.net
• MSDN: HttpResponseBase.BufferOutput