ASP.NET interview question :- How do we write a HttpModule ?

Answer:
Again a simple .NET Interview question Writing a HttpModule is a two step process.
Create a class which implements IhttpModule.

  public class clsHttpModule : IHttpModule
 {

 public void Init(HttpApplication context)
 {
    this.httpApp = context;
    httpApp.Context.Response.Clear();
    httpApp.AuthenticateRequest += new EventHandler(OnAuthentication);
    httpApp.AuthorizeRequest += new EventHandler(OnAuthorization);
 ....
 ....
 ....

 }
 void OnAuthorization(object sender, EventArgs a)
 {
     //Implementation
 }
 void OnAuthentication(object sender, EventArgs a)
 {   
     //Implementation
 }
 }

Make a entry in the web.config file.

  <httpModules>
<add name="clsHttpModule" type="clsHttpModule"/>
</httpModules>

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