Introduction to ASP.NET

Configuring .NET Web Applications MIS 424 Professor Sandvig Today 1. Why Web Applications? 2. IIS Role in handing a request IIS Applications

3. .NET Request Handling Global.asax 4. Configuration files Machine.config Web.Config

Why Applications? Dark ages (pre-2003) Server crashes not unusual Single failure bring down whole system Worse yet: Memory leaks

Cause IIS hang Stop serving pages Required manual intervention (reboot) Why Applications? Today Applications still crash Applications are compartmentalized OS handles gracefully

System rarely affected OS monitors application health Recycles unhealthy processes Result: system stable & reliable IIS Applications Folders may be configured as Applications

IIS configuration interface IIS Applications Many configuration options IIS Applications Each application is assigned to an Application Pool IIS Application Pools Each application pool has a unique Windows

process Specify error handling, timeouts, etc. for each Request Handling https://yorktown.cbe.wwu.edu/students/174/csandvig/music/index Source: https://codeteddy.com/2013/08/19/mvc3-interview-questions-and-answers/ .NET Application When URL points to IIS Application

IIS passes request to .NET .NET checks configuration files: Located in root folder global.asax Application event handler web.config Application configuration settings Global.asax

Handles application & session events 15+ events Application_start Application_error Session_start Located in root folder of application Triggered each page request

Global.asax Configures MVC application: public class WebApiApplication : System.Web.HttpApplication { protected void Application_Start() { AreaRegistration.RegisterAllAreas(); GlobalConfiguration.Configure(WebApiConfig.Register); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); } }

web.config Located in root folder XML format Many settings:

Connection strings Authentication Debugging .NET version Exception handling Timeouts Others .Net Application Example Example:

Create new application on server Summary Application Objectives: Reliability Convenient Configuration Flexibility Security

IIS Handles requests Passes to .NET MVC Configuration Global.asax Web.config