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As mentioned earlier, often most web applications require input from the user in one form or another. Validation logic is usually written on either the client or server side or quite often both. Client-side JavaScript can provide quick feedback to the user without a round-trip to the server, whereas server-side validation has the added benefit of having access to business logic and/or data access on the server. However, ensuring data integrity and validation is best done when the range of user input is limited based on expected data. Much like the FilteredTextBox extender, the MaskedEdit extender is designed to enforce validation on user input by using a mask and thus restricting the range of possible values entered into a TextBox control. The MaskedEdit is a little more sophisticated than the FilteredTextBox extender in that it offers visual guidance to the user to enter the correct data and supports more complex rules through the use of MaskedEditValidator controls. Table 8-5 lists the properties of this extender.

Furthermore, you are able to register an emulator under HKEY_LOCAL_MACHINE (see Figure 12-12). This is a good place for emulators that are installed with a setup program, for example, special emulators for development boards like the emulator of the Freescale i.MXS Development Kit (see 2). Wherever you register the emulator, both subkeys with GUID and friendly names are possible; they must just be unique.

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Remote Data Portal (with Enterprise Services)