Web Forms :: Time Out Downloading Large Files?

I used this sample to work around the issue we were having with large files. [URL] Unfortunately, when I attempt to download large files of 30MBs or more, the download times out and the user gets a partial download. It doesn't seem to be a consistant percentage of the download either. I attempted to download a 50MB file and got to 33MB. When trying a 30MB file, I downloaded 24MB.Below is my code.

if (File.Exists(strFilePath))
{
fileName = System.IO.Path.GetFileName(strFilePath);
Response.Clear();
system.IO.Stream iStream = null;
byte[] buffer = new Byte[10000];
int length;
long dataToRead;
try
{
iStream = new System.IO.FileStream(strFilePath, System.IO.FileMode.Open,
System.IO.FileAccess.Read, System.IO.FileShare.Read);
dataToRead = iStream.Length;
//FileInfo file = new FileInfo(strFilePath);
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Length", iStream.Length.ToString());
Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName.Replace(" ", string.Empty));
while (dataToRead > 0)
{
if (Response.IsClientConnected)
{
length = iStream.Read(buffer, 0, 10000);..................