ASP.NET

protected void Page_Load(object sender, EventArgs e)
        {
            string markers = GetMarkers();
            string map = @"
<script type='text/javascript' src='http://maps.googleapis.com/maps/api/js?sensor=false&key=keyvalue'></script>
<script type='text/javascript'>
function initialize() {

var mapOptions = {
center: new google.maps.LatLng(28.3213, 77.5435),
zoom: 2,
mapTypeId: google.maps.MapTypeId.ROADMAP
};

var myMap = new google.maps.Map(document.getElementById('mapArea'),
mapOptions);" + markers + @"}
</script>
";

            Page.ClientScript.RegisterStartupScript(this.GetType(), "initialize", map, false);
        }



        protected string GetMarkers()
        {
            string markers = "";
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString =ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
            {
                SqlCommand cmd = new SqlCommand("SELECT Latitude, Longitude, RegistrationNumber FROM DriverLocation", conn);
                conn.Open();
                SqlDataReader reader = cmd.ExecuteReader();
                int i = 0;

                while (reader.Read())
                {
                    i++;
                    markers +=
                    @"var marker" + i.ToString() + @" = new google.maps.Marker({
position: new google.maps.LatLng(" + reader["Latitude"].ToString() + ", " +
                    reader["Longitude"].ToString() + ")," +
                    @"map: myMap,
title:'" + reader["RegistrationNumber"].ToString() + "'});";
                }
            }
            return markers;
        }
    }

@model Portal.Models.BaseViewModel

Hi, @Model.FirstName

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Portal.Models
{
    public class BaseViewModel
    {
        public String FirstName { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Portal.Models;

namespace Portal.Controllers
{
    public class BaseController : Controller
    {
        public BaseController()
        {
            BaseViewModel baseModel = new BaseViewModel()
            {
                FirstName = "John"
            };
        }
    }
}

public class DashboardController : BaseController

System.NullReferenceException: 'Object reference not set to an instance of an object.'

        public object Get()
        {

            dynamic model = null;

            using (AppDevSecEntities ctx = new AppDevSecEntities())
            {
                BSCCrystalReportsViewerEntities ctx2 = new BSCCrystalReportsViewerEntities();

                string maxLanId = ctx.UserLists.OrderByDescending(x => x.LastName).First().WindowsUserName;
                var tempUserJobs = (from c in ctx.UserJobs orderby c.SupervisorUserName select c).Where(x => x.WindowsUserName == maxLanId);
                DataTable UserJobs = Common.ConvertToDataTable<UserJob>(tempUserJobs);

                model =
                    new
                    {
                        SingleEmployee = ctx.spGetShortSingleEmployee(maxLanId).FirstOrDefault(),
                        Departments = (from c in ctx.Departments orderby c.DepartmentName select c).ToList<Department>(),

                        Locations = (from c in ctx.Locations orderby c.LocationName select c).ToList<Location>(),
                        Supervisors = (from c in ctx.Supervisors orderby c.LastName, c.FirstName select c).ToList<Supervisor>(),
                        Managers = (from c in ctx.Managers orderby c.LastName, c.FirstName select c).ToList<Manager>(),
                        Directors = (from c in ctx.Directors orderby c.LastName, c.FirstName select c).ToList<Director>(),
                        Applications = (from c in ctx.Applications orderby c.ApplicationName select c).ToList<Application>(),
                        ApplicationGroups = (from c in ctx.ApplicationGroups orderby c.ApplicationGroupName select c).ToList<ApplicationGroup>(),
                        ApplicationSecurityRoles = (from c in ctx.ApplicationSecurityRoles orderby c.ApplicationSecurityRoleName select c).ToList<ApplicationSecurityRole>(),<br />
                        UserJobs
                    };
            }

            return model;
        }

    loadEmployee: function (employeeID) {
        $.get("/api/EmployeeAPI/Get").then(function (data) {

            var list = $("#ddlApplicationGroup");
            var selectedValue = list.val();

            list.empty();

            $.each(data.ApplicationGroups, function (index, applicationgroup) {
                $("<option>").attr("value", applicationgroup.ApplicationGroupID).text(applicationgroup.ApplicationGroupName).appendTo(list);
            });

            if ((selectedValue == null) || (selectedValue == undefined)) {
                list.prepend("<option value='-1' selected='selected'>Select value</option>");
                list[0].selectedIndex = 0;
            }
            else {
                list.val(selectedValue);
            }

        });
    }

            var a = data.UserJobs;
            var columns = a.api.columns();

            a.columns().every(function () {
                alert(a[0].val();<br />
            });

            $.each(a, function (bb) {               
                alert(a[bb][0]);              
            });

public ActionResult UploadFiles(int? id)
        {
            CI cI = db.DataBase.Find(id);
            foreach (string upload in Request.Files)
            {
                
                if (Request.Files[upload].FileName != "")
                    
                {
                    string path = Server.MapPath(@"/App_Data/uploads/" + id + "/");
                    string filename = Path.GetFileName(Request.Files[upload].FileName);
                    Response.Write(path);
             
                    bool check = System.IO.File.Exists(Path.Combine(path, filename));
                    

                    //Check if the filename exists or not, send message and refresh
                    if (check==true)
                    {
                        Session["msg"] = "File with the same name already exists - Choose another file or change the file name";
                        System.Diagnostics.Debug.Write("file exists");
                        return RedirectToAction("UploadFiles");
                    }

                    if (check == false)
                    {
                        Session["msg"] = "Successfull Upload";
                        Request.Files[upload].SaveAs(Path.Combine(path, filename));
                        System.Diagnostics.Debug.Write("Upload success");
                        return RedirectToAction("UploadFiles");
                    }
                }
            }

                     return View("Upload");
        }

@Session["msg"];