The startup class is the entry point of the ASP.NET Core application. Every .NET Core application must have this class. This class contains the application configuration related items. It is not necessary that the class name must be "Startup", it can be anything, we can configure the startup class in the Program class.
public class Program
{
public static void Main(string[] args)
{
CreateWebHostBuilder(args).Build().Run();
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<TestClass>();
}
