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Part VI:

an empty string, and for this reason it doesn t appear in the ValidationSummary control or in the message box.

Regardless of whether client-side scripts are enabled, all the validation controls validate their companion controls when the page is submitted to the server, without any interven tion on you part. Nevertheless, you usually explicitly perform server-side validation in a specific location in code such as in the Page_Load event or in the Click event of the button that fires the postback so that your application can take any step that is appropriate. You can force the validation of all controls by invoking the Validate method. Then you can check the page s IsValid property and, if False, iterate over all the validation con trols to detect which fields contain invalid values:

L nk games us ng mach nes connected v a W F adapters It seems that XNA works best when commun cat ng across rea w re Bear ng n m nd that dur ng network p ay t s mportant that the systems have a re ab e and speedy network connect on, t s probab y best to use w re anyway

Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) _ Handles Button1.Click Force the validation of all controls. Me.Validate() If Not Me.IsValid Then Dim errorCount As Integer Count how many errors were found. For Each ctrl As BaseValidator In Me.Validators If Not ctrl.IsValid Then errorCount += 1 Next Display a suitable error message. lblStatus.Text = There are & errorCount.ToString & errors." End If End Sub

Notice that the message prepared by the preceding code is displayed only if the clientside scripts have been disabled in the browser or the client-side validation has been turned off. In fact, if client-side validation is enabled, the form can t be posted back to the server until all input fields contain a valid value.

How much will those 100 copies cost you It depends on a lot of different options: the quality, color, and weight (usually expressed in pounds per 1000 sheets) of the paper, the number of ink colors, the dimensions of the publication, whether it requires folding, and so on The price typically ranges from $075 per copy to more than $125 per copy Depending on the purpose of the publication, that might be way too expensive A quick way of getting an idea of the cost of your project is to upload your publication to an online printer, select the options you want, and then see what the price would be (Just be careful to not click the order button unless you re sure you want to spend the money.

All the controls in this group DropDownList, ListBox, RadioButtonList, CheckBoxList inherit from the ListControl class and therefore have several members in common in addition to those inherited from the WebControl base class. Like their Windows Forms counterparts, all these controls expose the Items, SelectedIndex, SelectedItem, and SelectedValue properties (this last property was added in version 1.1 of the .NET Framework), and the SelectedIndexChanged event. They also expose a few properties related to data binding that I ll cover later in the next chapter, namely the DataSource, DataMember, DataTextField, DataValueField, and DataTextFormatString properties.

24:

To find out how to create a network game, you are going to make a new game called Bread and Cheese Pong. Your younger brother really likes the name. It will be a simple pong game, with each player controlling a bat and hitting the cheese towards the opponent. You can use a lot of the bread and cheese sprite code that you have already written in previous chapters. A good starting point would be a simple, two-player pong game, as shown in Figure 16-3. This game finally answers the question, Which is better, white bread or brown bread with bread bats being used to hit the cheese ball. The players are defending their back wall if cheese hits the back wall, the player on the opposing side gains a point.