using GroupDocs.Annotation;
using GroupDocs.Annotation.Models;
using GroupDocs.Annotation.Models.FormatSpecificComponents.Pdf;
using System;
using System.Collections.Generic;

namespace AddingCheckBoxToPDFUsingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Set License to avoid the limitations of the Annotation library
            License license = new License();
            license.SetLicense(@"Conholdate.Annotator.lic");

            // Create the Annotator object with the input PDF path
            using (Annotator annotator = new Annotator("input.pdf"))
            {
                CheckBoxComponent checkBox = new CheckBoxComponent
                {
                    Checked = true,
                    Box = new Rectangle(100, 100, 100, 100),
                    PenColor = 65535,
                    Style = BoxStyle.Star,
                    Replies = new List<Reply>
                    {
                        new Reply
                        {
                            Comment = "First comment",
                            RepliedOn = DateTime.Now
                        },
                        new Reply
                        {
                            Comment = "Second comment",
                            RepliedOn = DateTime.Now
                        }
                    }
                };
                // Add the checkbox to the Annotator
                annotator.Add(checkBox);
                // Save the resultant PDF
                annotator.Save("result.pdf");
            }
        }
    }
}