Building Your First Web App with C# ASP.NET

To begin developing ASP.NET Core applications, we'll first install Visual Studio Community Edition.Make sure to select these essential components during installation.The installation will take some time as it downloads and configures all necessary components.Once installed, we'll create a new ASP.NET Core Web Application using the MVC template.Configure your project settings, making sure to select the MVC template and appropriate authentication options.The MVC template creates a structured project with several important folders.Your project includes several important configuration files that control various aspects of your application.Visual Studio provides powerful features to enhance your development experience.In ASP.NET Core MVC, controllers handle incoming HTTP requests and manage the application's logic.The controller inherits from the Controller base class, contains action methods, and returns View results to be displayed.Views use Razor syntax to combine HTML markup with C# code. The at symbol indicates C# code blocks and expressions.Razor views can access model data, use ViewData for passing information, and include dynamic content.Models are classes that define the data structure passed between controllers and views.The routing system connects URLs to controller actions using attributes or convention-based routing.When a request comes in, the routing system matches the URL pattern to the appropriate controller action.The MVC pattern creates a clear separation of concerns, with data flowing from the request through the controller, model, and finally to the view.First, let's create a model with data annotations for validation.Then we'll create a form in our view that uses these model properties.The validation process flows from client-side to server-side validation.For database connectivity, we'll set up our DbContext class.Configure the connection string in appsettings.json.Implement proper error handling in your controller actions.Here's how errors flow through your application.Write unit tests to verify your controller actions work correctly.Here are some helpful debugging tips when using IIS Express.