Why viewmodel in asp net mvc

To do this we'll position the text cursor within the Index action method, then right-click and select "Add View". This will bring up the Add View dialog:. The "Add View" dialog allows us to quickly and easily generate View template files. By default the "Add View" dialog pre-populates the name of the View template to create so that it matches the action method that will use it.

Because we used the "Add View" context menu within the Index action method of our HomeController, the "Add View" dialog above has "Index" as the view name pre-populated by default.

We don't need to change any of the options on this dialog, so click the Add button. The name and folder location of the "Index. The view template name, Index, matches the controller action method which will be displaying the view. NET MVC allows us to avoid having to explicitly specify the name or location of a view template when we use this naming convention to return a view. Visual Web Developer created and opened the "Index. The contents of Index. The first three lines set the page title using ViewBag.

We'll look at how this works in more detail soon, but first let's update the text heading text and view the page. Most websites have content which is shared between many pages: navigation, footers, logo images, stylesheet references, etc. We'll want our MVC Music Store to have a common header with links to our Home page and Store area on all pages in the site, so we'll add that to the template directly above that RenderBody statement.

The empty project template includes a very streamlined CSS file which just includes styles used to display validation messages. Our designer has provided some additional CSS and images to define the look and feel for our site, so we'll add those in now. We'll select both of them in Windows Explorer and drop them into our Solution's Content folder in Visual Web Developer, as shown below:.

To create a dynamic web site, we'll instead want to pass information from our controller actions to our view templates. In the Model-View-Controller pattern, the term Model refers to objects which represent the data in the application. Often, model objects correspond to tables in your database, but they don't have to.

Controller action methods which return an ActionResult can pass a model object to the view. This allows a Controller to cleanly package up all the information needed to generate a response, and then pass this information off to a View template to use to generate the appropriate HTML response. This is easiest to understand by seeing it in action, so let's get started.

First we'll create some Model classes to represent Genres and Albums within our store. Let's start by creating a Genre class. Right-click the "Models" folder within your project, choose the "Add Class" option, and name the file "Genre. This gives us the benefits of a property without requiring us to declare a backing field. Next, follow the same steps to create an Album class named Album. Now we can modify the StoreController to use Views which display dynamic information from our Model.

If - for demonstration purposes right now - we named our Albums based on the request ID, we could display that information as in the view below. Shailendra Chauhan Print 2 min read 27 Jul In ASP. It is used to pass data from controller to strongly-typed view. ViewModel can have multiple entities or objects from different data models or data source.

UserName Html. Password Html. ToList ; if q. AddModelError "", "The user name or password provided is incorrect. Since view reperesents the properties of the ViewModel, hence it is easy for rendering and maintenance. Use a mapper when ViewModel become more complex. Summary In this article I try to expose the ViewModel with example. If we want to display more than one model on view in asp.

The following image shows a visual representation of the view model in asp. Here we will learn asp. Now start with creating a viewmodel in asp. Before that, let's look at the table we are going to use in our application. In this database part, we will create the required tables in the database with the following scripts. Let's start with creating a new asp. After that, you will see a new dialog for selecting your Template and Project type.

After naming it, click on the OK new dialog to select a template in that Select Basic template and click ok like as shown below. For adding Entity framework, right-click on your application and from the list select " Manage NuGet Packages ". After getting the search value, select EntityFramework click on the install button. After adding the Entity framework now, we are going to add ADO. For adding ADO. After clicking on ADO.

After that, a new Wizard will popup where we are going to configure the Entity Data Model. In this, we are going to use Database first. From that select Generate from database and click on the Next button.

Now click on New Connection, new Dialog will popup. Here we need to configure it. After adding the database connection, our Entity Data Model Wizard will look like the below snapshot. Now click on the Next button.