Default Route in ASP.NET MVC

{controller}/{action}/{id}

Default Route Code (RouteConfig.cs)

RouteConfig.cs

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

namespace Your_Project_Name
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
               routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

                routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new 
                { 
                    controller = "Home",action = "Index",id = UrlParameter.Optional 
                }
            );
        }
    }
}

Understanding the Default Route

• controller → Name of the Controller
• action → Action Method inside Controller
• id → Optional Parameter

Example 1

URL:

https://localhost:1234/Student/Details/5

Explanation:

• Student → StudentController
• Details → Details() method
• 5 → id parameter

Example 2 (When URL is Empty)

URL:

https://localhost:1234/

Since no controller and action are given, MVC uses default values:

• Controller → Home
• Action → Index

So it automatically calls:

HomeController → Index()

Simple Real-Life Example

Imagine a school:

• School Gate → URL
• Department → Controller
• Teacher → Action Method
• Student Roll Number → ID

If you don’t mention department, the school sends you to the Main Office (Home/Index).

Important Points

• Default route follows {controller}/{action}/{id}
• ID is optional
• Home/Index is default page
• It works automatically in every MVC project

Summary

✔ Default route connects URL to Controller & Action
✔ Pattern: {controller}/{action}/{id}
✔ id is optional
✔ Home/Index is default fallback