The PdfChoiceFormFieldFacade<T> class and its descendants were changed

What Changed

In the scope of the T1027469 bug fix, the PdfChoiceFormFieldFacade<T>.MultiSelect and PdfChoiceFormFieldFacade<T>.Value properties were removed. These properties were moved to the PdfComboBoxFormFieldFacade class (the PdfChoiceFormFieldFacade<T> descendant). Another class descendant, the PdfListBoxFormFieldFacade class, now has the Values property that allows you to specify multiple values for the list box form field.

Reasons for Change

In previous versions, you could not specify multiple values for the list box form fields. We made changes in API to introduce this functionality.

How to Update Existing Apps

If you need to specify a single value for the list box form field, use the PdfListBoxFormFieldFacade.Values property instead of the PdfChoiceFormFieldFacade<T>.Value property as shown below:

C#
using (PdfDocumentProcessor pdfDocumentProcessor = new PdfDocumentProcessor())
{
    pdfDocumentProcessor.LoadDocument("Documents//FormDemo.pdf"); 

    PdfDocumentFacade documentFacade = pdfDocumentProcessor.DocumentFacade;
    PdfAcroFormFacade acroForm = documentFacade.AcroForm;

    PdfListBoxFormFieldFacade listField = acroForm.GetListBoxFormField("List");        
    listField.Values = new List<string>() { listField.Items[2].Value };
}