Where is the program cs or startup cs file in asp net


When working with ASP.NET, it is common to wonder where the program.cs or .cs file is located. files play a crucial role in the ASP.NET application's startup process and . In this article, we will explore the and purpose of these files in an ASP.NET project.

Understanding the Program.cs File

The program.cs file is typically found in the root directory of an ASP.NET project. It serves as the entry point for the application and contains the main method. This method is responsible for creating an of the web host and the application.

Let's take a look at an example of a program.cs file:

In this example, the program.cs file creates an instance of the web host using the CreateHostBuilder method. It then builds the host and runs the application.

Understanding the Startup.cs File

The startup.cs file is also typically located in the root directory of an ASP.NET project. It is responsible for configuring the application's services and middleware. The ConfigureServices method is used to configure services such as connections, authentication, and injection. The Configure method is used to configure the middleware pipeline.

Here is an example of a startup.cs file:

using Microsoft..Builder;
using Microsoft.AspNetCore.;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace YourNamespace
    public class Startup
        public Startup(IConfiguration configuration)
            Configuration = configuration;

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
            // Configure services here

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
            // Configure middleware pipeline here

In this example, the ConfigureServices method can be used to add services to the application's service container. The Configure method is responsible for configuring the middleware pipeline, which determines how requests are handled and processed.


The program.cs and startup.cs files are essential components of an ASP.NET project. The program.cs file serves as the entry point for the application, while the startup.cs file is responsible for configuring services and middleware. Understanding the purpose and location of these files is crucial for developing and maintaining ASP.NET applications.

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