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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;

}