I have followed this tutorial for signal r 

http://techbrij.com/database-change-notifications-asp-net-signalr-sqldependency

Instead of using MVC or Web api I have used Web Forms and Called the method as 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default2 : System.Web.UI.Page
{
    
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    [WebMethod]
    // GET api/values
    public IEnumerable<JobInfo> Get()
    {
        JobInfoRepository objRepo = new JobInfoRepository();
        return objRepo.GetData();
    }
}

And in Ajax

        $(function () {

            // Proxy created on the fly
            var job = $.connection.jobHub;

            // Declare a function on the job hub so the server can invoke it
            job.client.displayStatus = function () {
                getData();
            };

            // Start the connection
            $.connection.hub.start();
            getData();
        });

        function getData() {
            var $tbl = $('#tblJobInfo');
            $.ajax({
                url: "/Default2.aspx/Get",
                type: 'GET',
                datatype: 'json',
                success: function (data) {
                    if (data.length > 0) {
                        $tbl.empty();
                        $tbl.append(' <tr><th>ID</th><th>Name</th><th>Last Executed Date</th><th>Status</th></tr>');
                        var rows = [];
                        for (var i = 0; i < data.length; i++) {
                            rows.push(' <tr><td>' + data[i].JobID + '</td><td>' + data[i].Name + '</td><td>' + data[i].LastExecutionDate.toString().substr(0, 10) + '</td><td>' + data[i].Status + '</td></tr>');
                        }
                        $tbl.append(rows.join(''));
                    }
                }
            });
        }