viewbag in asp.net mvc

ViewBag is a dynamic property that is available in ASP.NET MVC views and can be used to pass data from the controller to the view.

Here's how to use ViewBag in ASP.NET MVC:

1. In the controller, create a new instance of ViewBag and set its properties to the data you want to pass to the view. For example:

public ActionResult MyAction()
{
    ViewBag.Title = "My Page Title";
    ViewBag.Message = "Welcome to my page!";
    return View();
}

2. In the view, you can access the data stored in the ViewBag by using the dynamic property syntax ViewBag.<property name>. For example:

@{
    ViewBag.Title = "My Page Title";
    ViewBag.Message = "Welcome to my page!";
}

# @ViewBag.Title
<p>@ViewBag.Message</p>

3. The ViewBag can store any type of data, including strings, numbers, objects, and collections. However, since ViewBag is a dynamic property, it does not provide compile-time checking, so you need to be careful when accessing its properties to avoid runtime errors.

4. You can also use ViewBag to pass data to a partial view. In this case, you can set the ViewBag properties in the parent view or in the controller action that returns the partial view. For example:

@{
    ViewBag.Title = "My Page Title";
    ViewBag.Message = "Welcome to my page!";
}

<div>
   @Html.Partial("_MyPartial")
</div>

In the partial view:

## @ViewBag.Title
<p>@ViewBag.Message</p>

ViewBag can be a convenient way to pass data between the controller and view, especially for small amounts of data that do not require a strongly-typed model. However, for larger amounts of data or for data that requires more complex manipulation, it is often better to use a strongly-typed model or a view model.