Table of Contents for Multiple HTMLs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.Controllers.HTML_to_PDF.Table_of_Contents
{
    public class Merge_Table_of_ContentsController : Controller
    {
        [HttpPost]
        public ActionResult ConvertHtmlToPdf(IFormCollection collection)
        {
            // Get the server options
            string serverIP = collection["textBoxServerIP"];
            uint serverPort = uint.Parse(collection["textBoxServerPort"]);
            string servicePassword = collection["textBoxServicePassword"];
            bool useServicePassword = servicePassword.Length > 0;
            bool useTcpService = collection["ServerType"] == "radioButtonUseTcpService";
            string webServiceUrl = collection["textBoxWebServiceUrl"];

            // Create a PDF document
            Document pdfDocument = null;
            if (useTcpService)
                pdfDocument = new Document(serverIP, serverPort);
            else
                pdfDocument = new Document(true, webServiceUrl);

            // Set optional service password
            if (useServicePassword)
                pdfDocument.ServicePassword = servicePassword;

            // Set license key received after purchase to use the converter in licensed mode
            // Leave it not set to use the converter in demo mode
            pdfDocument.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // Create a PDF page where to add the first HTML
            PdfPage firstPdfPage = pdfDocument.AddPage();

            // Enable the creation of a table of contents from H1 to H6 tags found in HTML
            pdfDocument.TableOfContents.AutoTocItemsEnabled = collection["autoTableOfContentsCheckBox"].Count > 0;

            // Optionally set the table of contents title
            pdfDocument.TableOfContents.Title = "Table of Contents";

            // Optionally set the title style using CSS sttributes
            pdfDocument.TableOfContents.TitleStyle = "color:navy; font-family:'Times New Roman'; font-size:28px; font-weight:normal";

            // Optionally set the style of level 1 items in table of contents
            string level1TextStyle = "color:black; font-family:'Times New Roman'; font-size:20px; font-weight:normal; font-style:normal; background-color:#F0F0F0";
            pdfDocument.TableOfContents.SetItemStyle(1, level1TextStyle);

            // Optionally set the page numbers style of level 1 items in table of contents
            string level1PageNumberStyle = "color:black; padding-right:3px; background-color:#F0F0F0; font-size:14px; font-weight:bold";
            pdfDocument.TableOfContents.SetPageNumberStyle(1, level1PageNumberStyle);

            // Create the first HTML to PDF element
            HtmlToPdfElement firstHtml = new HtmlToPdfElement(0, 0, collection["firstUrlTextBox"]);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            firstHtml.ConversionDelay = 2;

            // Enable or disable the table of contents for the first HTML document
            firstHtml.TableOfContentsEnabled = collection["includeFirstHtmlTocCheckBox"].Count > 0;

            // Add the first HTML to PDF document
            firstPdfPage.AddElement(firstHtml);

            PdfPage secondPdfPage = null;

            // Create the second HTML to PDF element
            HtmlToPdfElement secondHtml = new HtmlToPdfElement(0, 0, collection["secondUrlTextBox"]);

            // Optionally set a delay before conversion to allow asynchonous scripts to finish
            secondHtml.ConversionDelay = 2;

            // Enable or disable the table of contents for the second HTML document
            secondHtml.TableOfContentsEnabled = collection["includeSecondHtmlTocCheckBox"].Count > 0;

            if (collection["startNewPageCheckBox"].Count > 0)
            {
                // Create a PDF page where to add the second HTML
                secondPdfPage = pdfDocument.AddPage();

                // Add the second HTML to PDF document
                secondPdfPage.AddElement(secondHtml);
            }
            else
            {
                // Add the second HTML right after the first one
                pdfDocument.AddElement(secondHtml);
            }

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Send the PDF file to browser
            FileResult fileResult = new FileContentResult(outPdfBuffer, "application/pdf");
            fileResult.FileDownloadName = "Merge_Table_of_Contents.pdf";

            return fileResult;
        }
    }
}