Encode a FileStream to base64 with c#

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An easy one as an extension method

public static class Extensions
{
    public static Stream ConvertToBase64(this Stream stream)
    {
        byte[] bytes;
        using (var memoryStream = new MemoryStream())
        {
            stream.CopyTo(memoryStream);
            bytes = memoryStream.ToArray();
        }

        string base64 = Convert.ToBase64String(bytes);
        return new MemoryStream(Encoding.UTF8.GetBytes(base64));
    }
}

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