ViewBag

– ViewBag is used to send a small amount of data to the view.
– There may be some situation where you want to transfer some temporary data to view which is not included in the model object.
– The viewBag is a dynamic type property of ControllerBase class.
– It does not retain value when redirection occurs,it is available only for Current Request.
– ViewBag is a dynamic property and it makes use of the C# 4.0 dynamic features.

public class DemoController : Controller
{
    IList CarList = new List() {
    new Car(){ CarName="i10", CarColor="Black",CarMileage=18.2 },
    new Car(){ CarName="EON", CarColor="Silver", CarMileage=18.2 },
    new Car(){ CarName="Swift", CarColor="Red", CarMileage=18.2},
    new Car(){ CarName="Verna", CarColor="Black", CarMileage=18.2},
    new Car(){ CarName="Ciaz", CarColor="Silver", CarMileage=18.2}
}
public ActionResult Index()
{
   ViewBag.TotalCar = CarList.Count();
   return View();
}

ViewData

– ViewData is similar to ViewBag, It can be used to send data from controller to view.
– It is a dictionary , which possese key-value pairs, where each key must be string.
– Viewdata last long only for current http request.

public class DemoController : Controller
{
    public ActionResult Index()
    {
       ViewData["Simple"] = "This string is stored in viewData.";
       return View();
    }
}

 

To get back value from viewData write below line in view.

@ViewData[“Simple”]

TempData

– TempData retain value across subsequent HTTP Request
– It can be use to maintain data between controller actions as well as redirects.
– It internally stores data in session but it get destroyed earliar than session.

In the below example, a string value is stored in the TempData object in JupiterController
and it is redirected to EarthController and finally it is displayed in View.

public class JupiterController : Controller
{
   // GET: First
   public ActionResult Index()
   {
      TempData["Message"] = "Jupiter is largest planet in solar system";
      return new RedirectResult(@"~\Earth\");
   }
}

public class EarthController : Controller
{
      // GET: Second
      public ActionResult Index()
      {
         return View();
      }
}

View of EarthController

<html>
<head>
   <meta name="viewport" content="width=device-width"/>
   <title>Solar System</title>
</head>
<body>
    <div>
    @TempData["Message"];
    </div>
</body>
</html>

Read :

Summary

You can also read about ASP.NET,C#.NET, JQUERY, AJAX.
I hope you get an idea about ViewData, ViewBag and TempData.
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