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FileStream outputStream = new FileStream("url");
Stream ftpStream = response.GetResponseStream();
int bufferSize = 2048;
byte[] buffer = new byte[bufferSize];
int readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpStream.Read(buffer, 0, bufferSize);
}