What is ViewBag?

Introduction

This article demonstrates an interesting and very useful concept in ASP.NET MVC.

Question: What is ViewBag?

In simple terms "ViewBag is the data holder that enables the definition of a dynamic property and holds the data that can be passed from a controller to a view".

Step 1: Create a new ASP.NET MVC application

Step 2: Adding new Model

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Web;  
5. using System.Web.Mvc;  
6. using ViewBagDemoApp.Models;  
7. namespace ViewBagDemoApp.Controllers  
8. {  
9.     public class AdditionController : Controller  
10.     {  
11.         //// GET: /Addition/  
12.         public ActionResult Index(Addition addition)  
13.         {  
14.             ViewBag.AddMessage = "Addition Result is: ";  
15.             ViewBag.Result = addition.FirstNumber + addition.SecondNumber;  
16.             if (ViewBag.Result < 1)  
17.             {  
18.                 ViewBag.AddMessage = string.Empty;  
19.                 ViewBag.Result = string.Empty;  
20.             }  
21.             return View();  
22.         }  
23.     }  
24. }
    

Step 4: Adding new View

I hope this article was useful for you. I look forward to your comments and feedback. Thanks, Vijay.