ViewBag in asp.net mvc

• ViewBag is an object type which is a dynamic property of ControllerBase class.

public Object ViewBag { get; }

• ViewBag provides communication between controller and view. ViewBag passes data from controller to corresponding view.
• ViewBag is similar to ViewData but is slower than ViewData.
•  MVC 3.0 introduced ViewBag and is available in MVC 3.0 and above.ViewBag works only with .net framework 4.0 and above.
• Typecasting is not required for complex data type.
• The lifetime of ViewBag is short and is limited to current request only. It becomes null once the redirection occurs.

Example of ViewBag:

Action code within Controller:

public ActionResult Index()
{
      List<string> Student = new List<string>();
      Student.Add("Jignesh");
      Student.Add("suraj");
      Student.Add("mayank");
 
      ViewBag.Student = Student;
      return View();
} 

View Corresponding to Index action using ViewBag:

<ul>
    <% foreach (var student in ViewBag.Student)
        { %>
    <li><%: student%></li>
    <% } %>
</ul>