What is ViewBag?

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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

ASP.NET MVC application

Step 2: Adding new Model

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace ViewBagDemoApp.Models
{
public class Addition
{
[Required(ErrorMessage = "Please Enter FirstNumber")]
public int FirstNumber { get; set; }
[Required(ErrorMessage = "Please Enter SecondNumber")]
public int SecondNumber { get; set; }
}
}

Step 3: Adding new Controller

Adding new Controller

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ViewBagDemoApp.Models;
namespace ViewBagDemoApp.Controllers
{
public class AdditionController : Controller
{
//// GET: /Addition/
public ActionResult Index(Addition addition)
{
ViewBag.AddMessage = "Addition Result is: ";
ViewBag.Result = addition.FirstNumber + addition.SecondNumber;
if (ViewBag.Result < 1)
{
ViewBag.AddMessage = string.Empty;
ViewBag.Result = string.Empty;
}
return View();
}
}
}

Step 4: Adding new View

Adding new MVC View

Adding new MVC View

Step 5: The output for the application is as in the following

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