ASP.NET

[GET("allproducts")]
[GET("all")]
public HttpResponseMessage Get()
{
 
}
 

[GET("productid/{id?}")]
[GET("particularproduct/{id?}")]
[GET("myproduct/{id:range(1, 3)}")]
public HttpResponseMessage Get(int id)
{
 
}
 
[POST("Create")]
[POST("Register")]
public int Post([FromBody] ProductEntity productEntity)
{
 
}
 

[PUT("Update/productid/{id}")]
[PUT("Modify/productid/{id}")]
public bool Put(int id, [FromBody] ProductEntity productEntity)
{
 
}
 
// DELETE api/product/5
[DELETE("remove/productid/{id}")]
[DELETE("clear/productid/{id}")]
[PUT("delete/productid/{id}")]
public bool Delete(int id)
{
 
}

[GET("productid/{id?}")]
[GET("particularproduct/{id?}")]
[GET("myproduct/{id:range(1, 3)}")]
public HttpResponseMessage Get(int id)
{}

[DELETE("remove/productid/{id}")]
[DELETE("clear/productid/{id}")]
[PUT("delete/productid/{id}")]
public bool Delete(int id)
{
 if (id > 0)
     return _productServices.DeleteProduct(id);
 return false;
}

[RoutePrefix("Movie")]
public class HomeController : Controller
{
      //Route: Movie/Index
      [Route]
      public ActionResult Index()
      {
           ViewBag.Message = "You are in Home Index";
           return View();
      }

      //Route: NewRoute/About
       [Route("~/NewRoute/About")]
       public ActionResult About()
       {
           ViewBag.Message = "You successfully reached NEWRoute/About route";
           return View();
       }
}

[GET("productid/{id?}")]
public HttpResponseMessage Get(int id)
{
    var product = _productServices.GetProductById(id);
    if (product != null)
        return Request.CreateResponse(HttpStatusCode.OK, product);
    return Request.CreateErrorResponse(HttpStatusCode.NotFound, "No product found for this id");
}

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.'