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When the user clicks the Display button, the hashtable is retrieved, and all the information it contains is displayed in a label Public partial Class ViewStateObjects Inherits SystemWebUIPage ' This will be created at the beginning of each request Private textToSave As New Hashtable() Protected Sub cmdSave_Click(ByVal sender As Object, ByVal e As SystemEventArgs) ' Put the text in the Hashtable SaveAllText(Table1Controls, True) ' Store the entire collection in view state ViewState("ControlText") = textToSave End Sub Private Sub SaveAllText(ByVal controls As ControlCollection, ByVal saveNested As Boolean) For Each control As Control In controls If TypeOf control Is TextBox Then ' Add the text to a collection textToSaveAdd(controlID, (CType(control, TextBox))Text) End If If (controlControls IsNot Nothing) AndAlso saveNested Then SaveAllText(controlControls, True) End If Next End Sub.

Summary

Protected Sub cmdDisplay_Click(ByVal sender As Object, ByVal e As System.EventArgs) If ViewState("ControlText") IsNot Nothing Then ' Retrieve the hashtable. Dim savedText As Hashtable = CType(ViewState("ControlText"), Hashtable) ' Display all the text by looping through the hashtable. lblResults.Text = String.Empty For Each item As DictionaryEntry In savedText lblResults.Text &= CStr(item.Key) & " = " _ & CStr(item.Value) & "<br />" Next End If End Sub End Class Figure 6-2 shows the result of a simple test, after entering some data, saving it, and retrieving it.

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The point of this chapter was to introduce you to the role of the C# class type. As you have seen, classes can take any number of constructors that enable the object user to establish the state of the object upon creation. This chapter also illustrated several class design techniques (and related keywords). Recall that the this keyword can be used to obtain access to the current object, the static keyword allows you to define fields and members that are bound at the class (not object) level, and the const keyword (and readonly modifier) allows you to define a point of data that can never change after the initial assignment. The bulk of this chapter dug into the details of the first pillar of OOP: encapsulation. Here you learned about the access modifiers of C# and the role of type properties, object initialization syntax, and partial classes. With this behind you, you are now able to turn to the next chapter where you will learn to build a family of related classes using inheritance and polymorphism.

Unlike control properties, member variables that you add to your web-page classes are never saved in view state. Interestingly, you can work around this limitation using view state.

The previous chapter examined the first pillar of OOP: encapsulation. At that time, you learned how to build a single well-defined class type with constructors and various members (fields, properties, constants, and read-only fields). This chapter will focus on the remaining two pillars of OOP: inheritance and polymorphism. First, you will learn how to build families of related classes using inheritance. As you will see, this form of code reuse allows you to define common functionality in a parent class that can be leveraged, and possibly altered, by child classes. Along the way, you will learn how to establish a polymorphic interface into the class hierarchies using virtual and abstract members. I wrap up by examining the role of the ultimate parent class in the .NET base class libraries: System.Object.

You have two basic approaches. The first is to create a property procedure that wraps view state access. For example, in the previous web page you could provide the control text hashtable as a property like this: Private Property ControlText() As Hashtable Get If ViewState("ControlText") IsNot Nothing Then Return CType(ViewState("ControlText"), Hashtable) Else Return New Hashtable() End If End Get Set ViewState("ControlText") = Value End Set End Property Now the rest of your page code can freely use the ControlText property, without worrying about how it s being retrieved. The other approach is to save all your member variables to view state when the Page.PreRender event occurs and retrieve them when the Page.Load event occurs. That way, all your other event handlers can use the member variables normally. Keep in mind when you use either of these techniques you must be careful not to store needless amounts of information. If you store unnecessary information in view state, it will enlarge the size of the final page output and can thus slow down page transmission times.

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