Download file from a directory

I have ran into a situation where im able to download a file by specifying the file path but the issue is that the file is download in a unknown format. The code below shows the downloading process:

if (e.CommandName == "ViewFiles")
{

int index = Convert.ToInt32(e.CommandArgument);

GridViewRow row = gvunclassified.Rows[index];

string division = row.Cells[4].Text;

string filenames = row.Cells[1].Text;

string paths = @"NewFolder1" + "\\" + division + "\\" + "UnClassified" + "\\" + filenames;
string drive = @"C:\Website2\RecordsManagement";
string temppath = Path.Combine(drive, paths);


// The file path to download.

string filepath = temppath;

// The file name used to save the file to the client's system..

string filename = Path.GetFileName(filepath);
System.IO.Stream stream = null;
try
{
// Open the file into a stream.
stream = new FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
long bytesToRead = stream.Length;
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
// Read the bytes from the stream in small portions.
while (bytesToRead > 0)
{
// Make sure the client is still connected.
if (Response.IsClientConnected)
{
// Read the data into the buffer and write into the
// output stream.
byte[] buffer = new Byte[10000];
int length = stream.Read(buffer, 0, 10000);
Response.OutputStream.Write(buffer, 0, length);
Response.Flush();
// We have already read some bytes.. need to read
// only the remaining.
bytesToRead = bytesToRead - length;
}
else
{
// Get out of the loop, if user is not connected anymore..
bytesToRead = -1;
}
}
}
catch (Exception ex)
{
Response.Write(ex.Message);
// An error occurred..
}
finally
{
if (stream != null)
{
stream.Close();
}
}

Any suggestion would be highly appreciated. Actually the most surprising part is that if I use google chrome as my browser then the file is downloaded in the right format but an unknown format file is download if I use IE or Mozilla firefox.

Tags: C# (C# 3.0)