Here is the source code for the stream file function:

        private void StreamFile(string SourceFilepath, string
OutputFilename)
        {
            System.IO.Stream iStream = null;

            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10000];

            // Length of the file:
            int length;

            // Total bytes to read:
            long dataToRead;

            try
            {
                // Open the file.
                iStream = new System.IO.FileStream(SourceFilepath,
System.IO.FileMode.Open);

                // Total bytes to read:
                dataToRead = iStream.Length;

                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;
filename=" + OutputFilename);
                Response.AddHeader("Content-Length", dataToRead.ToString
());
(编辑:aniston)