How can I make a check box use a check mark instead of an 'X'?

[Aaron]

Q:

In a PDF form, I'd like for a check mark to appear instead of an 'X'.  How can I change this?

A:

The "interactive forms" code sample shows how to change whether a check mark, cross, etc. is used the in the check box:

https://www.pdftron.com/pdfnet/samplecode.html#InteractiveForms

See the "createCheckmarkAppearance" function for details.