MSDN Documentation (.NET API)

System.Web

Contains types for building ASP.NET web applications.

Classes

HttpApplication Class

public abstract class HttpApplication : IHttpModule

Base class for ASP.NET applications.

Provides event handlers for application-level events such as application start, application end, and request handling.

Example


public class Global : HttpApplication
{
    protected void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        RegisterRoutes();
    }

    protected void Application_End(object sender, EventArgs e)
    {
        // Code that runs on application shutdown
    }

    void RegisterRoutes()
    {
        // Example of route registration (hypothetical for System.Web)
        // RouteTable.Routes.MapPageRoute("Default", "", "~/Default.aspx");
    }
}

HttpRequest Class

public sealed class HttpRequest

Encapsulates the information that is necessary to use Web-based servers to service incoming requests.

Provides access to request details like URL, HTTP headers, form data, query strings, and cookies.
HttpResponse Class

public sealed class HttpResponse

Encapsulates the information that is necessary to use Web-based servers to service incoming HTTP requests.

Provides methods and properties to construct the HTTP response, including setting headers, status codes, and writing content.
HttpContext Class

public sealed class HttpContext

Encapsulates all information about an individual HTTP request.

This class provides access to the HttpRequest, HttpResponse, and HttpSessionState objects for the current request.
HttpCookie Class

public sealed class HttpCookie

Represents an HTTP cookie.

Allows for the creation, modification, and management of cookies sent to and received from the client.

Interfaces

IHttpHandler Interface

public interface IHttpHandler

Defines the contract for HTTP handlers that process incoming requests.

Implementations of this interface are responsible for generating the response for a given HTTP request.
IHttpModule Interface

public interface IHttpModule

Defines the contract for HTTP modules that can process requests and responses.

Modules intercept HTTP requests and responses to perform tasks such as authentication, logging, or modifying content.

Enums

HttpVerbs Enum

public enum HttpVerbs

Defines the standard HTTP request methods.

Common values include GET, POST, PUT, DELETE.


// Example usage
if (Request.HttpMethod == (int)HttpVerbs.Post)
{
    // Handle POST request
}