ViewData Vs ViewBag Vs TempData

Let us create an ASP.NET application,
Open Visual Studio, File, then New Project,
Create a controller name, “SayHello,” which contains the information which will pass in view available in controller.

For passing the information from controller to view here we will use View data.

View Data: It is an object of ViewDataDictionary type. It contains the value like array notation.

Here view data contains values like:

ViewData["username"] = name;

To show the value using ViewData we need to add View.

Add View: Right click on view and click Add View like, 
After that view shows like this.
After that I have write some message like. 
  1. @{  
  2.     ViewBag.Title = "SayHello";  
  3. }  
  5. <h2>Hi, @ViewData["username"].ToString() Welcome to first MVC Application.</h2>  
Here I have to type cast ViewData into string because it returns an object of ViewDataDictionary type.
Now I will execute my application. Then an error will come like this:  
Because we must have to pass controller name and actionresult name and its parameter, h here we pass controller name and actionresult name and its parameter like this: 

will be show After that output like.



It is a wrapper for viewdata. It performs same functionality but it is a dynamic property that takes advantage of the new dynamic features in C# 4.0. It is dot(.) notation . It does not need to type cast. 

Same ActionResult I used ViewBag like. 
  1. namespace ViewbagVsViewDataVsTempData.Controllers  
  2. {  
  3.     public class CheckDemoController : Controller  
  4.     {  
  5.       public ActionResult SayHello(string id)  
  6.         {  
  7.             //ViewData["username"] = id;  
  8.             ViewBag.usertname = id;  
  9.             return View();  
  10.         }  
  11.     }  
  12. }  
And view is like that. 
  1. @{  
  2.     ViewBag.Title = "SayHello";  
  3. }  
  5. @*<h2>Hi, @ViewData["username"].ToString() Welcome to first MVC Application.</h2>*@  
  7. <h2>.usertname  Welcome Hi, @ViewBag to first MVC Application.</h2>  



It is used for passing data from one controller to another controller or one request to other request. TempData contains the data until target is completely loaded. TempData is a dictionary object that is derived from TempDataDictionary class and stored in short live sessions.
It is also needs to type cast 

For TempData I create some actionresult like and view. Here we store the data in TempData for passing one controller to another controller. 

  1. public ActionResult CreateForm()  
  2.       {  
  3.           return View();  
  4.       }  
  6.       [HttpPost]  
  7.         public ActionResult CreateForm(string id)  
  8.       {  
  9.           TempData["username"] = id;  
  10.           return RedirectToAction("ShowMessage");  
  11.       }  
Add view of CreateForm Controller: 
  1.     @{  
  2.     ViewBag.Title = "CreateForm";  
  3. }  
  5. <h2>Create User</h2>  
  7. @using (Html.BeginForm()) {   
  9.     <div>  
  10.         <input id="name" type="text"/>  
  11.         <p><input id="btncreate" type="submit" value="Create"> </p>  
  12.      </div>  
  13. }  

This view shows like this:


Those values enter this textbox that value stores in TempData and shows tempdata value in other ActionResult(ShowMessage) view.

And Add Another Action result here for showing the TempData stored value.
  1. public ActionResult ShowMessage()  
  2. {  
  3.     return View();  
  4. }  

View :

  1. @{  
  2.     ViewBag.Title = "ShowMessage";  
  3. }  
  5. <h2>Hi, @TempData["username"].ToString()  Welcome to first MVC Application using TempData.</h2>  

The first time completely load view with TempData, after that tempdata is lost. For checking  it when we refresh a page then we get an error like:  
This error proves completely loaded TempData;  after that data is lost.
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