Hi @bhavna ,
You can check the official document: Global.asax file replacement
The entry point for ASP.NET applications is the Global.asax file. Tasks such as route configuration and filter and area registrations are handled in the Global.asax file. This approach couples the application and the server to which it's deployed in a way that interferes with the implementation. In an effort to decouple, OWIN was introduced to provide a cleaner way to use multiple frameworks together. OWIN provides a pipeline to add only the modules needed. The hosting environment takes a Startup function to configure services and the app's request pipeline. Startup registers a set of middleware with the application. For each request, the application calls each of the middleware components with the head pointer of a linked list to an existing set of handlers. Each middleware component can add one or more handlers to the request handling pipeline. This is accomplished by returning a reference to the handler that's the new head of the list. Each handler is responsible for remembering and invoking the next handler in the list. With ASP.NET Core, the entry point to an application is Startup, and you no longer have a dependency on Global.asax. ASP.NET Core uses a similar approach, but doesn't rely on OWIN to handle the entry. Instead, that's done through the Program.cs Main method (similar to console applications) and Startup is loaded through there.
So, in asp.net core application, the host and application have been decoupled, which provides the flexibility of moving to a different platform in the future.
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