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It s interesting to look at the internal implementation of the Execute method. Both the main and child pages are run by the same HttpApplication object as if they were the same request. What happens within the folds of Execute is a sort of context switch. First, the method obtains an HTTP handler from the application factory to serve the new request. The original handler of the main request is cached and replaced with the new handler. The spawned page inherits the context of the parent; when this step is finished, any modification made to Session or Application is immediately visible to the main page.

Another interesting suggestion from Microsoft is that you never define a parameter that has as its only purpose reserved for future use because newer versions of the class can overload a method (see next section) to support additional arguments without breaking backward compatibility with existing code.

FindItems( /", Nothing, myConditions)

The handler switching makes the whole operation extremely fast, as there s no need to create a new object to serve the request. When the child page returns, the original handler is restored. The execution of the main page continues from the point at which it was stopped, but it uses the context inherited from the child page. Caution ASP.NET directly calls the handler indicated by the Execute method without reapplying

Visual Basic .NET lets you overload a method. Method overloading means that you can provide multiple methods with the same name but different parameter signatures that is, with a different number of parameters or with parameters of a different type. (A method s signature is defined as the list of its parameters and its return value; parame ters names don t affect the signature, but their types and whether they are passed via ByRef or ByVal do.) Before explaining how you implement overloaded methods, I think it makes sense to illustrate why overloading can be useful. Suppose you re creat ing a collectionlike class and include an Item method that provides access to the col lection s elements through either a numeric or a string argument. This is the code that you write under Visual Basic 6 to implement such a method:

any authentication and authorization logic. If your security policy requires clients to have proper authorization to access the resource, the application should force reauthorization. You can force reauthorization by using the Response.Redirect method instead of Execute. When Redirect is called, the browser places a new request in the system, which will be authenticated and authorized as usual by IIS and ASP.NET. As an alternative, you can verify whether the user has permission to call the page by defining roles and checking the user s role before the application calls the Execute method.

Function Item(index As Variant) As String If VarType(index) = vbLong Or VarType(index) = vbInteger Then Access an element through its numeric index. ElseIf VarType(index) = vbString Then Access an element through its string key. Else Raise a run-time error otherwise. Err.Raise 999, , Invalid index type" End If End Function

The Transfer method differs from the Execute method in that it terminates the current page after executing the specified page. The new page runs as if it was the originally requested one. The Transfer method has the following overloads:

public void Transfer(String); public void Transfer(String, Boolean); public void Transfer(IHttpHandler, Boolean);

The Visual Basic .NET solution is cleaner: you define multiple procedures with the same name and different syntax. You can explicitly state that you re overloading the Item method by prefixing it with the Overloads keyword:

The string parameter indicates the destination URL. The Boolean parameter indicates what to do with regard to the QueryString and Form collections. If the parameter is true, the collections are preserved; otherwise, they are cleared and made unavailable to the destination page (which is the recommended approach). You can also directly indicate the HTTP handler to invoke, with the same security issues that were mentioned for Execute. All the code that might be following the call to Transfer in the main page is never executed. In the end, Transfer is just a page redirect method. However, it is particularly efficient for two reasons. First, no roundtrip to the client is requested, as is the case, for example, with Response.Redirect. Second, the same HttpApplication that was serving the caller request is reused, thus limiting the impact on the ASP.NET infrastructure.

Dim userInfo As New localhost.UserInfoHeader()