// assume that an ImageX object has been created and is valid
// create a memory stream that will grow as needed.
System.IO.MemoryStream memoryStream = new System.IO.MemoryStream( );
// Save an ImageX object to jpg format with default parameters
imageX.SaveStream( memoryStream, Accusoft.ImagXpressSdk.ImageXFormat.Jpeg );
memoryStream.Close( );