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the screen, rather than adding to it, you should clear the screen in the paint() method. You ll see how to do this in the FontCanvas example later in this chapter.

Your final option is to disable validation and perform the work on your own, with the help of the validation controls. This allows you to take other information into consideration or create a specialized error message that involves other controls (such as images or buttons). You can create manual validation in one of three ways: Use your own code to verify values. In this case, you won t use any of the ASP.NET validation controls. Disable the EnableClientScript property for each validation control. This allows an invalid page to be submitted, after which you can decide what to do with it depending on the problems that may exist. Add a button with CausesValidation set to false. When this button is clicked, manually validate the page by calling the Page.Validate() method. Then examine the IsValid property, and decide what to do.

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The next example uses the second approach. Once the page is submitted, it examines all the validation controls on the page by looping through the Page.Validators collection. Every time it finds a control that hasn t validated successfully, it retrieves the invalid value from the input control and adds it to a string. At the end of this routine, it displays a message that describes which values were incorrect, as shown in Figure 9-5.

1. Using Visual Studio, build the event handler assembly. 2. Deploy the event handler assembly to the GAC. This can be done by opening the Microsoft .NET Configuration Framework console from Administrative Tools. 3. If the assembly is being redeployed, restart the Microsoft BizTalk RFID service. This will ensure that the most recent assembly is executed when a process runs. Referencing the BizTalk RFID Libraries The MSMQ event handler, like all event handlers, inherits from the RfidEventHandlerBase class and requires several BizTalk RFID specific assemblies to be referenced. These required assemblies are Microsoft.RFID.Design, Microsoft.RFID.SpiSDK, and Microsoft.RFID.Util, all of which are in the bin folder of the installation directory of Program Files\Microsoft BizTalk RFID. Once these assemblies have been referenced, the using directive in the event handler should appear as shown in Listing 8-1. Listing 8-1. Event Handler using Directive using using using using using using using using using using System; System.Collections.Generic; System.Text; Microsoft.SensorServices.Rfid; Microsoft.SensorServices.Rfid.Utilities; Microsoft.SensorServices.Rfid.Dspi; System.Messaging; System.Globalization; System.Xml; System.Runtime.Serialization;

An application can force the implementation to service all the repaint requests by calling serviceRepaints() on the Canvas object. This method does not return until all pending repaint requests have been serviced. If you are going to call serviceRepaints(), you should make sure that you aren t trying to acquire object locks in the paint() method that won t be released until serviceRepaints() returns. In general, you won t need to call serviceRepaints(); you can usually use Display s callSerially() method instead. (See the Multithreading and Animation section of this chapter for a discussion of callSerially().)

Figure 9-5. Manual validation This technique adds a feature that wouldn t be available with automatic validation, which uses the ErrorMessage property. In that case, it isn t possible to include the actual incorrect values in the message. To try this example, set the EnableCientScript property of each validator to false. Then, you can use the code in this event handler to check for invalid values. protected void cmdOK_Click(Object sender, EventArgs e) { string errorMessage = "<b>Mistakes found:</b><br />"; // Search through the validation controls. foreach (BaseValidator ctrl in this.Validators) { if (!ctrl.IsValid) { errorMessage += ctrl.ErrorMessage + "<br />"; // Find the corresponding input control, and change the // generic Control variable into a TextBox variable. // This allows access to the Text property. TextBox ctrlInput = (TextBox)this.FindControl(ctrl.ControlToValidate); errorMessage += " * Problem is with this input: "; errorMessage += ctrlInput.Text + "<br />"; } } lblMessage.Text = errorMessage; }

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