Stream.CopyTo

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public static MemoryStream CopyStream(Stream inputStream)
{
    MemoryStream outputStream = new MemoryStream();
    int Length = 256;
    Byte[] buffer = new Byte[Length];
    int bytesRead = inputStream.Read(buffer, 0, Length);
    // write the required bytes
    while (bytesRead > 0)
    {
        outputStream.Write(buffer, 0, bytesRead);
        bytesRead = inputStream.Read(buffer, 0, Length);
    }
    inputStream.Close();
    outputStream.Close();
    return outputStream;
}