itextsharp PDF populate checkbox

I use itextsharp c# to populate value to pdf. The textbox is populated accordingly except the checkbox. And I do not know how to make the checkbox (Checked).

Just FYI. the checkbox export value is "Yes" on PDF document that I use.
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ITsolutionWizardAsked:
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Danilo AndradeIT Systems AnalystCommented:
If you have the correct string value for the checkbox, have you tried adding "Yes" to the box like so:
form.SetField("box1","Yes");

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You can also try with "True" or "checkboxstates[1]" to see if it will work.

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ITsolutionWizardAuthor Commented:
tried it still not working
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