Hi mahesh213,

Check this example. Now please take its reference and correct your code.

Namespaces

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web.Mvc;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.tool.xml

Controller

public class HomeController : Controller
{
    // GET: /Home/
    public ActionResult Index()
    {
        return View();
    }

    public JsonResult getAll()
    {
        return Json(GetOrders(), JsonRequestBehavior.AllowGet);
    }

    public JsonResult GenerateReport(int OId)
    {
        string html = "";
        Order order = GetOrders().Where(x => x.Orderid == OId).FirstOrDefault();
        html += "<table><tr>" +
                "<td>OrderId : </td><td>" + order.Orderid + "</td><td>&nbsp;</td>" +
                "<td>OrderName : </td><td>" + order.OrderName + "</td><td>&nbsp;</td>" +
                "<td>OrderDate : </td><td>" + order.Orderdate + "</td><td>&nbsp;</td>" +
                "</tr></table><p>&nbsp;</p>";
        List<Item> itemlist = GetItems().Where(x => x.OrderId == OId).ToList();
        html += "<table border='1' cellpadding='0' cellspacing='0' width='100%'><tr>" +
                "<th align='center'>ItemId</th>" +
                "<th align='center'>OrderId</th>" +
                "<th align='center'>ItemName</th>" +
                "<th align='center'>Price</th>" +
                "<th align='center'>Quantity</th>" +
                "<th align='center'>Total</th>" +
                "<th align='center'>TTotal</th>" +
                "<th align='center'>GTotal</th>" +
                "</tr>";
        double finalTotal = 0;
        for (int i = 0; i < itemlist.Count; i++)
        {
            double total = (itemlist[i].Price * itemlist[i].Quantity);
            double tTotal = 0;
            List<Tax> taxes = GetTaxes().Where(x => x.ItemId == itemlist[i].ItemId).ToList();
            for (int j = 0; j < taxes.Count; j++)
            {
                tTotal += total * taxes[j].Per / 100;
            }
            html += "<tr>" +
                    "<td>&nbsp;" + itemlist[i].ItemId + "</td>" +
                    "<td>&nbsp;" + itemlist[i].OrderId + "</td>" +
                    "<td>&nbsp;" + itemlist[i].ItemName + "</td>" +
                    "<td>&nbsp;" + itemlist[i].Price + "</td>" +
                    "<td>&nbsp;" + itemlist[i].Quantity + "</td>" +
                    "<td>&nbsp;" + total + "</td>" +
                    "<td>&nbsp;" + tTotal + "</td>" +
                    "<td>&nbsp;" + (total + tTotal) + "</td>" +
                    "</tr>";
            finalTotal += total + tTotal;
        }
        html += "</table><p>FinalTotal : " + finalTotal + "</p>";

        using (MemoryStream stream = new MemoryStream())
        {
            StringReader sr = new StringReader(html);
            Document pdfDoc = new Document(PageSize.A4, 5f, 5f, 10f, 5f);
            PdfWriter writer = PdfWriter.GetInstance(pdfDoc, stream);
            pdfDoc.Open();
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
            pdfDoc.Close();
            TempData["Data"] = stream.ToArray();
        }

        return new JsonResult() { Data = new { FileName = "Report.pdf" } };
    }

    [HttpGet]
    public virtual ActionResult Download(string fileName)
    {
        if (TempData["Data"] != null)
        {
            byte[] data = TempData["Data"] as byte[];
            return File(data, "application/pdf", fileName);
        }
        else
        {
            return new EmptyResult();
        }
    }

    public class Order
    {
        public int Orderid { get; set; }
        public string OrderName { get; set; }
        public string Orderdate { get; set; }
    }

    private List<Order> GetOrders()
    {
        List<Order> orders = new List<Order>();
        orders.Add(new Order { Orderid = 1, OrderName = "aaaaaaaaa", Orderdate = "01/02/2019" });

        return orders;
    }

    public class Item
    {
        public int ItemId { get; set; }
        public int OrderId { get; set; }
        public string ItemName { get; set; }
        public int Price { get; set; }
        public int Quantity { get; set; }
    }

    private List<Item> GetItems()
    {
        List<Item> items = new List<Item>();
        items.Add(new Item { ItemId = 1, OrderId = 1, ItemName = "a", Price = 1234, Quantity = 12 });
        items.Add(new Item { ItemId = 2, OrderId = 1, ItemName = "b", Price = 100, Quantity = 1 });

        return items;
    }

    public class Tax
    {
        public int TId { get; set; }
        public int ItemId { get; set; }
        public string Type { get; set; }
        public int Per { get; set; }
    }

    private List<Tax> GetTaxes()
    {
        List<Tax> taxes = new List<Tax>();
        taxes.Add(new Tax { TId = 1, ItemId = 1, Type = "CGST", Per = 12 });
        taxes.Add(new Tax { TId = 2, ItemId = 1, Type = "SGST", Per = 10 });
        taxes.Add(new Tax { TId = 3, ItemId = 2, Type = "IGST", Per = 5 });
        taxes.Add(new Tax { TId = 4, ItemId = 2, Type = "Normal", Per = 10 });

        return taxes;
    }
}

View

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Index</title>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" />
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.js"></script>
    <script type="text/javascript">
        var app = angular.module('MyApp', []);
        app.controller('MyController', ['$scope', '$http', function ($scope, $http) {
            $http({
                method: 'GET',
                url: '/Home/getAll/'
            }).success(function (data) {
                $scope.items = data;
            });

            $scope.GenerateReport = function (id) {
                $http({
                    method: 'POST',
                    url: '/Home/GenerateReport/',
                    params: { OId: id }
                }).success(function (data) {
                    window.location = '/Home/Download?filename=' + data.FileName;
                });
            };
        } ]);
    </script>
</head>
<body ng-app="MyApp" ng-controller="MyController">
    <div class="container" id="printarea">
        <table class="table table-bordered">
            <tr class="success">
                <th>OrderId</th>              
                <th>OrderName</th>
                <th>OrderDate</th> 
                <th></th>               
            </tr>
            <tr ng-repeat="item in items">
                <td>{{item.Orderid}}</td>
                <td>{{item.OrderName}}</td>
                <td>{{item.Orderdate}}</td>                
                <td>
                    <button class="btn btn-success btn-sm" ng-click="GenerateReport(item.Orderid)">
                        <span class="glyphicon glyphicon-print"></span>&nbsp;PDF
                    </button>
                </td>
            </tr>
        </table>
    </div>
</body>
</html>

Screenshot