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You can throw this custom exception like this: Private Function DivideNumbers(ByVal number As Decimal, _ ByVal divisor As Decimal) As Decimal If divisor = 0 Then Dim err As New CustomDivideByZeroException() err.DividingNumber = number Throw err Else Return number/divisor End If End Function To perfect the custom exception, you need to supply it with the three standard constructors. This allows your exception class to be created in the standard ways that every exception supports: On its own, with no arguments With a custom message With a custom message and an exception object to use as the inner exception These constructors don t actually need to contain any code. All these constructors need to do is forward the parameters to the base class (the constructors in the inherited ApplicationException class) using the MyBase keyword, as shown here: Public Class CustomDivideByZeroException Inherits ApplicationException ' Add a variable to specify the "other" number. ' Depending on the circumstance, this might help diagnose the problem. Private _dividingNumber As Decimal Public Property DividingNumber() As Decimal Get Return _dividingNumber End Get Set(ByVal value As Decimal) _dividingNumber = value End Set End Property Public Sub New() MyBase.New() End Sub Public Sub New(ByVal message As String) MyBase.New(message) End Sub

Here s the full page code for CrossPage1aspx with this property:.

VB also provides a Select Case block that you can use to evaluate a single variable or expression for multiple possible values. The Select Case statement supports the String, Char, Date, and Boolean data types, as well as virtually every simple numeric data type. In the following code, each case examines the MyNumber variable and tests whether it s equal to a specific integer. Select Case MyNumber Case 1 ' Do something if MyNumber = 1. Case 2 ' Do something if MyNumber = 2. Case Else ' Do something if MyNumber is anything else. End Select If desired, you can handle multiple cases with one segment of code by including a list of comma-separated values in the Case statement.

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public partial class CrossPage1 : System.Web.UI.Page { public string FullName { get { return txtFirstName.Text + " " + txtLastName.Text; } } } This way, the relationship between the two pages is clear, simple, and easy to maintain. You can probably change the controls in the source page (CrossPage1) without needing to change other parts of your application. For example, if you decide to use different controls for name entry in CrossPage1.aspx, you will be forced to revise the code for the FullName property. However, your changes would be confined to CrossPage1.aspx, and you wouldn t need to modify CrossPage2.aspx at all. Here s how you can rewrite the code in CrossPage2.aspx to display the information from CrossPage1.aspx: protected void Page_Load(object sender, EventArgs e) { if (PreviousPage != null) { lblInfo.Text = "You came from a page titled " + PreviousPage.Title + "<br />"; CrossPage1 prevPage = PreviousPage as CrossPage1; if (prevPage != null) { lblInfo.Text += "You typed in this: " + prevPage.FullName; } } } Notice that the target page (CrossPage2.aspx) can access the Title property of the previous page (CrossPage1.aspx) without performing any casting. That s because the Title property is defined as part of the base System.Web.UI.Page class, and so every web page includes it. However, to get access to the more specialized FullName property, you need to cast the previous page to the right page class (CrossPage1) or use the PreviousPageType directive that was discussed earlier. Figure 8-5 shows the new result.

Select Case MyNumber Case 1, 2 ' Do something if MyNumber = 1 Or MyNumber = 2. Case Else ' Do something if MyNumber is anything else. End Select Unlike the If block, Select Case is limited to evaluating a single piece of information at a time. However, it provides a leaner, clearer syntax than the If block for situations where you need to test a single variable against a limited set of possible values.

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