How can I do parallel in one session? - asp.net-mvc-4

Question

My Download function is below. It's in Controller Class:
public void Download(string fileId)
{
// **************************************************
//MAKE FILEPATH
string filePath = makeFilePath(fileId);
string outFileName = _info.FileName;
System.IO.Stream iStream = null;
// Create buffer for reading [intBufferSize] bytes from file
int intBufferSize = 10 * 1024;
byte[] buffer = new System.Byte[intBufferSize];
// Length of the file That Really Has Been Read From The Stream and Total bytes to read
int length; long dataToRead;
// **************************************************
if (System.IO.File.Exists(filePath))
{
try
{
// Open the file.
iStream = new System.IO.FileStream(
path: filePath,
mode: System.IO.FileMode.Open,
access: System.IO.FileAccess.Read,
share: System.IO.FileShare.Read);
// Total bytes to read:
dataToRead = iStream.Length;
// **************************************************
Response.Clear();
// Setting the unknown [ContentType]
// will display the saving dialog for the user
Response.ContentType = "application/octet-stream";
// With setting the file name,
// in the saving dialog, user will see
// the [outFileName] name instead of [download]!
Response.AddHeader("Content-Disposition", "attachment; filename=" + outFileName);
// Notify user (client) the total file length
Response.AddHeader("Content-Length", iStream.Length.ToString());
// **************************************************
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (Response.IsClientConnected)
{
// Read the data and put it in the buffer.
length = iStream.Read(buffer: buffer, offset: 0, count: intBufferSize);
// Write the data from buffer to the current output stream.
Response.OutputStream.Write(buffer: buffer, offset: 0, count: length);
// Flush (Send) the data to output
// (Don't buffer in server's RAM!)
Response.Flush();
buffer = new Byte[intBufferSize];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch (Exception ex)
{
throw new ApplicationException(ex.Message);
}
finally
{
if (iStream != null)
{
//Close the file.
iStream.Close();
iStream = null;
}
Response.Close();
}
}
}
}
Everything work ok, but when I'm downloading a file, I cannot take other actions in my controller until the download process is finished.
How can I solve that?
I think the problem is that server is too busy to process file. And the Response gate of server is busy, too, so that, when client send a new request, it'll be pending.

Answer 1

I've solved my problem by putting the attribute [SessionState(SessionStateBehavior.ReadOnly)] on the controller.
It worked fine.