Get an error tring to using EncoderValue.CompressionCCITT3

Question

The error message is "Invalid parameter used.", but when I change it to .CompressionLZW it works. All the examples that I found were written in VB.NET and they look like my function below. private bool SaveTIFF(ref string outputFile, ref Bitmap bmp, bool bAdd) { try { System.Drawing.Imaging.Encoder eng = System.Drawing.Imaging.Encoder.SaveFlag; System.Drawing.Imaging.Encoder eng1 = System.Drawing.Imaging.Encoder.Compression; EncoderParameters ep=new EncoderParameters(2); ep.Param[0]=new EncoderParameter(eng,(long)EncoderValue.MultiFrame); ep.Param[1] = new EncoderParameter(eng1,(long)EncoderValue.CompressionCCITT3); ImageCodecInfo info=GetEncoderInfo("image/tiff"); if (!bAdd) { bmp.Save(outputFile,info,ep); } else { bmp.SaveAdd(ep); } bmp.Dispose(); return true; }