How to convert BMP to GIF in C#

static void Main(string[] args)
{
    Bitmap myBitmap=new Bitmap(@"test.bmp");
    ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/gif"); ;
    EncoderParameter encCompressionrParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionLZW); ;
    EncoderParameter encQualityParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 0L);
    EncoderParameters myEncoderParameters = new EncoderParameters(2);
    myEncoderParameters.Param[0] = encCompressionrParameter;
    myEncoderParameters.Param[1] = encQualityParameter;
    myBitmap.Save("Output.gif", myImageCodecInfo, myEncoderParameters);
}

private static ImageCodecInfo GetEncoderInfo(String mimeType)
{
    int j;
    ImageCodecInfo[] encoders;
    encoders = ImageCodecInfo.GetImageEncoders();
    for (j = 0; j < encoders.Length; ++j)
    {
        if (encoders[j].MimeType == mimeType)
            return encoders[j];
    }
    return null;
}