SelectPdf for .NET 10 - Pdf Form Fields Filling - C# / .NET 10 Sample

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using SelectPdf.Universal;

namespace SelectPdf.Samples.Pages
{
    public class PdfFormFillingModel : PageModel
    {
        [BindProperty]
        public bool ChkFlatten { get; set; }

        public void OnGet()
        {

        }

        public IActionResult OnPost()
        {
            // the initial file
            string file = Path.Combine(Startup.ServerPath, "wwwroot", "files", "w-9.pdf");

            // load the pdf form manager
            PdfFormManager form = new PdfFormManager();
            form.Load(file);

            // fill some fields
            PdfFormFieldTextBox name =
                form.Fields["f1_01"] as PdfFormFieldTextBox;
            name.Text = "This is my name";

            PdfFormFieldTextBox businessName =
                form.Fields["f1_02"] as PdfFormFieldTextBox;
            businessName.Text = "This is my business name";

            PdfFormFieldCheckBox clasifIndividual =
                form.Fields["c1_1"] as PdfFormFieldCheckBox;
            clasifIndividual.Checked = true;

            PdfFormFieldTextBox address =
                form.Fields["f1_07"] as PdfFormFieldTextBox;
            address.Text = "This is my address";

            PdfFormFieldTextBox city =
                form.Fields["f1_08"] as PdfFormFieldTextBox;
            city.Text = "This is my city";

            PdfFormFieldTextBox employer1 =
                form.Fields["f1_14"] as PdfFormFieldTextBox;
            employer1.Text = "XX";

            PdfFormFieldTextBox employer2 =
                form.Fields["f1_15"] as PdfFormFieldTextBox;
            employer2.Text = "1234567";

            PdfFormFieldTextBox ssn1 =
                form.Fields["f1_11"] as PdfFormFieldTextBox;
            ssn1.Text = "123";

            PdfFormFieldTextBox ssn2 =
                form.Fields["f1_12"] as PdfFormFieldTextBox;
            ssn2.Text = "45";

            PdfFormFieldTextBox ssn3 =
                form.Fields["f1_13"] as PdfFormFieldTextBox;
            ssn3.Text = "6789";

            // flatten if checked
            form.Flatten = ChkFlatten;

            // save pdf document
            byte[] pdf = form.Save();

            // close pdf document
            form.Close();

            // return resulted pdf document
            FileResult fileResult = new FileContentResult(pdf, "application/pdf");
            fileResult.FileDownloadName = "Document.pdf";
            return fileResult;

        }
    }
}