Save List of bitmaps into a single Tiff

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C#

Hi all.

I have been experimenting with manipulating tiff images programmatically. That said my final product is loaded as a list of individual images in a list like so:

List<Bitmap> images = new List<Bitmap>();

I know the images are there as I can display them in picturebox.

My problem here is trying to collate all images and save as single multipage tiff file.

so far this is the code which I have found on the Microsoft site: Encoder.SaveFlag Field[^]

ImageCodecInfo myImageCodecInfo;
System.Drawing.Imaging.Encoder myEncoder;
EncoderParameter myEncoderParameter;
EncoderParameters myEncoderParameters;

// Get an ImageCodecInfo object that represents the TIFF codec.
myImageCodecInfo = GetEncoderInfo("image/tiff");

// Create an Encoder object based on the GUID 
// for the SaveFlag parameter category.
myEncoder = System.Drawing.Imaging.Encoder.SaveFlag;

// Create an EncoderParameters object. 
// An EncoderParameters object has an array of EncoderParameter 
// objects. In this case, there is only one 
// EncoderParameter object in the array.
myEncoderParameters = new EncoderParameters(1);

// Save the first page.
myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.CompressionCCITT4);
myEncoderParameters.Param[0] = myEncoderParameter;

final_Tiff.Save(destinaton, myImageCodecInfo, myEncoderParameters);

foreach (Bitmap bmp in images)
   {
   // Save rest of the pages.
   myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.CompressionCCITT4);
   myEncoderParameters.Param[0] = myEncoderParameter;
   final_Tiff.SaveAdd(bmp, myEncoderParameters);
   }

// Close the multiple-frame file.
myEncoderParameter = new EncoderParameter(myEncoder, (long)EncoderValue.Flush);
myEncoderParameters.Param[0] = myEncoderParameter;
final_Tiff.SaveAdd(myEncoderParameters);

The trouble occurs at:

final_Tiff.Save(destinaton, myImageCodecInfo, myEncoderParameters);

with error message: Object reference not set to an instance of an object.

I did check these values and they are not null. Any suggestions are welcome, and thanks in advance.