MemoryStream rawdata = new MemoryStream();
byte[] buffer = new byte[1024];
Stream rs = w.GetResponseStream();
int read = rs.Read(buffer,0,buffer.Length);
while(read > 0) {
   rawdata.Write(buffer,0,read);
    read = rs.Read(buffer,0,buffer.Length);
}
 
rs.Close();

 byte[] buffer = new byte[4096];
 
 using (MemoryStream memoryStream = new MemoryStream())
                {
                    int count = 0;
                    do
                    {
                        count = responseStream.Read(buffer, 0, buffer.Length);
                        memoryStream.Write(buffer, 0, count);
                    } while (count != 0);
                }

MemoryStream m = new MemoryStream();
Stream receiveStream = myHttpWebResponse.GetResponseStream();
using (StreamReader sr = new StreamReader(receiveStream)) 
{
    while (sr.Peek() >= 0) 
    {
                  memStream.WriteByte((byte)sr.Read());
    }
}

   FileStream inStream = File.OpenRead("c:\\text.txt");
    MemoryStream storeStream = new MemoryStream();
 
    storeStream.SetLength(inStream.Length);
    inStream.Read(storeStream.GetBuffer(), 0, (int)inStream.Length);
}

// Create the streams.
MemoryStream destination = new MemoryStream();
 
using (FileStream source = File.Open(@"c:\temp\data.dat", FileMode.Open))
{
 
    Console.WriteLine("Source length: {0}", source.Length.ToString());
 
    // Copy source to destination.
    source.CopyTo(destination);
}