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class MyMathClass { // Read-only fields can be assigned in ctors, // but nowhere else. public readonly double PI; public MyMathClass () { PI = 3.14; } } Again, any attempt to make assignments to a field marked readonly outside the scope of a constructor results in a compiler error: class MyMathClass { public readonly double PI; public MyMathClass () { PI = 3.14; } // Error! public void ChangePI() { PI = 3.14444;} }

The following code demonstrates a page that uses view state. It allows the user to save a set of values (all the text that s displayed in all the text boxes of a table) and restore it later. This example uses recursive logic to dig through all child controls, and it uses the control ID for the view state key, because this is guaranteed to be unique in the page.

Organizing the application in this way will allow you to easily implement other DAOs without affecting existing DAOs. For example, in 10, you will create a package called com.apress.usermanager.dao.hibernate, where you will store all your Hibernate implementation classes.

Unlike a constant field, read-only fields are not implicitly static. Thus, if you wish to expose PI from the class level, you must explicitly make use of the static keyword. If you know the value of a static read-only field at

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Here s the complete code: Public partial Class ViewStateTest Inherits System.Web.UI.Page Protected Sub cmdSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) ' Save the current text. SaveAllText(Page.Controls, True) 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 ' Store the text using the unique control ID. ViewState(control.ID) = (CType(control, TextBox)).Text End If If (control.Controls IsNot Nothing) AndAlso saveNested Then SaveAllText(control.Controls, True) End If Next control End Sub Protected Sub cmdRestore_Click(ByVal sender As Object, ByVal e As System.EventArgs) ' Retrieve the last saved text. RestoreAllText(Table1.Controls, True) End Sub Private Sub RestoreAllText(ByVal controls As ControlCollection, ByVal saveNested As Boolean) For Each control As Control In controls If TypeOf control Is TextBox Then If ViewState(control.ID) IsNot Nothing Then CType(control, TextBox).Text = CStr(ViewState(control.ID)) End If End If If (control.Controls IsNot Nothing) AndAlso saveNested Then RestoreAllText(control.Controls, True) End If Next control End Sub End Class Figure 6-1 shows the page in action.

compile time, the initial assignment looks very similar to that of a constant: class MyMathClass { public static readonly double PI = 3.14; } class Program { static void Main(string[] args) { Console.WriteLine("***** Fun with Const *****"); Console.WriteLine("The value of PI is: {0}", MyMathClass.PI); Console.ReadLine(); } } However, if the value of a static read-only field is not known until runtime, you must make use of a static constructor as described earlier in this chapter:

You can store your own objects in view state just as easily as you store numeric and string types. However, to store an item in view state, ASP.NET must be able to convert it into a stream of bytes so that it can be added to the hidden input field in the page. This process is called serialization. If your objects aren t serializable (and by default they aren t), you ll receive an error message when you attempt to place them in view state. To make your objects serializable, you need to add the Serializable attribute before your class declaration. For example, here s an exceedingly simple Customer class: <Serializable> _ Public Class Customer Public FirstName As String Public LastName As String Public Sub New(ByVal firstName As String, ByVal lastName As String) FirstName = firstName LastName = lastName End Sub End Class Because the Customer class is marked as serializable, it can be stored in view state: ' Store a customer in view state. Dim cust New Customer("Marsala", "Simons") ViewState("CurrentCustomer") = cust

class MyMathClass { public static readonly double PI; static MyMathClass() { PI = 3.14; } }

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