TOP 15 ASP.NET MVC Interview Questions with Answers
Tags: aspnetmvc, dotnet, mvc, csharp
Published: 2023-06-04 15:56:14

## 1.What is ASP.NET MVC?

**Answer**: ASP.NET MVC is a web development framework that follows the Model-View-Controller architectural pattern. It provides a structured approach to building dynamic web applications.

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---

## 2.Explain the MVC architectural pattern.

**Answer**: The MVC pattern separates an application into three main components: the Model (data and business logic), the View (presentation layer), and the Controller (handles user input and controls the flow). This separation promotes modularity and maintainability.

## 3.What is the difference between ASP.NET Web Forms and ASP.NET MVC?

**Answer**: ASP.NET Web Forms uses a stateful programming model, while ASP.NET MVC uses a stateless model. MVC provides better control over HTML, allows more testable code, and supports cleaner separation of concerns.

## 4.How do you define a route in ASP.NET MVC?

**Answer**: Routes in ASP.NET MVC define the URL patterns and map them to controller actions. A route is defined in the RouteConfig class using the MapRoute method.

```
routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
```

## 5.What is the Razor view engine in ASP.NET MVC?

**Answer**: Razor is a view engine used in ASP.NET MVC to render HTML views. It provides a compact syntax that combines HTML markup with server-side code.

```
<h1>Welcome, @Model.Name!</h1>

```
## 6.What is a ViewModel in ASP.NET MVC?

**Answer**: A ViewModel is a class that represents the data and behavior specific to a view. It is used to transfer data from the controller to the view and can contain additional properties or methods required for presentation logic.

## 7.Explain the concept of model binding in ASP.NET MVC.

**Answer**: Model binding automatically maps HTTP request data to action method parameters or properties of a model class. It simplifies the process of capturing user input and binding it to the corresponding model properties.

```
[HttpPost]
public ActionResult Create(Product product)
{
    // Code to save the product
    return RedirectToAction("Index");
}

```
## 8.How do you perform validation in ASP.NET MVC?

**Answer**: ASP.NET MVC provides both server-side and client-side validation. Server-side validation can be done using data annotations or custom validation logic.

```
public class Product
{
    [Required]
    public string Name { get; set; }
    
    [Range(1, 100)]
    public decimal Price { get; set; }
}
```

## 9.What is the TempData object in ASP.NET MVC?

**Answer**: TempData is a dictionary-like object used to store data temporarily between two consecutive requests. It is primarily used to transfer data from one action to another or from a controller to a view.

```
public ActionResult Create(Product product)
{
    // Code to save the product
    TempData["Message"] = "Product created successfully!";
    return RedirectToAction("Index");
}
```

## 10.Explain the concept of Areas in ASP.NET MVC.

**Answer**: Areas are used to organize large MVC applications into smaller functional sections. Each area can have its own controllers, views, and models. Areas help maintain a modular and structured application architecture.

## 11.What is the difference between ActionResult and ViewResult?

**Answer**: ActionResult is the base class for action results, while ViewResult represents a result that renders a view to the response. ViewResult derives from ActionResult and is commonly used to return a view from an action.

## 12.What is the difference between PartialView and View in ASP.NET MVC?

**Answer**: View renders a complete HTML page, including the layout and view content. PartialView renders a portion of the HTML page, typically used for rendering reusable

```
public ActionResult Index()
{
    // Full view
    return View();
    
    // Partial view
    return PartialView();
}
```

## 13.What are Action Filters in ASP.NET MVC?

**Answer**: Action Filters are attributes that can be applied to controllers or action methods to modify the behavior of the action execution. They can be used for logging, authorization, caching, and other cross-cutting concerns.

## 14.Explain the concept of Dependency Injection (DI) in ASP.NET MVC.

**Answer**: Dependency Injection is a design pattern that allows objects to define their dependencies through constructor parameters or properties. In ASP.NET MVC, DI frameworks like Unity or Ninject are commonly used to manage object dependencies.

## 15.How do you implement authentication and authorization in ASP.NET MVC?

**Answer**: ASP.NET MVC provides authentication and authorization features through ASP.NET Identity. It allows you to manage user authentication, roles, and permissions.

```
[Authorize(Roles = "Admin")]
public ActionResult AdminDashboard()
{
    // Code for admin dashboard
}
```

---


**For more resources**
_https://learn.microsoft.com/en-us/aspnet/mvc/_

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