Question

How to set several recognition languages?

Answer

Call SetPredefinedTextLanguage method with a parameter which contains several language names separated with commas, for example, "English,French,German".

DocumentProcessingParams.PageProcessingParams.RecognizerParams.SetPredefinedTextLanguage("English, French, German");
Document.Process(DocumentProcessingParams);

For some language combinations, there are separate language names. For example, “Mixed” language name corresponds to Russian and English languages.

All language names can be found in "Help" → "Specifications" → "Predefined languages".