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// create a second module module SecondModule = let n = 2 // create a third module // nested inside the second module ThirdModule = let n = 3 After you compile this code to the outside world, the first instance of n will be accessible using the identifier Strangelights.Beginning.FirstModule.n rather than just FirstModule.n. It s also possible to place several namespace declarations in the same source file, but you must declare them at the top level. In the previous example, this means you could have declared FirstModule and SecondModule in separate namespaces. You cannot declare SecondModule and ThirdModule in separate namespaces; because ThirdModule is nested inside SecondModule, you can t declare a separate namespace for ThirdModule. It s possible to define a namespace without also using a module directive, but then the namespace can contain only type definitions, as in this example: // a namespace definition namespace Strangelights.Beginning // a record defintion type MyRecord = { Field: string } The following example will not compile because you can t place a value definition directly into a namespace without explicitly defining a module or submodule within the namespace: // a namespace definition namespace Strangelights.Beginning // a value defintion, which is illegal // directly inside a namespace let value = "val" In fact, the namespace directive has some interesting and subtle effects on what your code looks like to other languages; you can learn more about this in 13.

For example, you might want to examine the order history in the database to verify that a customer doesn t have any outstanding payments before you allow an invoice to continue To increase performance (by avoiding an extra round-trip) or tighten security, you might choose to perform this check on the server instead of the client Server-side checking also allows you to update business rules without rolling out new client updates..

Note For more information on add-ins and additional software for Windows Home Server, take a look at

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Tip If your validation requirements are complex, you might need a way for the client to periodically download a list of rules from the server. This approach makes sure the latest validation rules are always in effect, without forcing you to update clients manually. One of the simplest ways to do this is to use a DataSet that is configured with all the database schema information, including data types and maximum field lengths. However, this won t help you validate more-complex rules (like making sure a phone number field has the right format).

As you have seen in the previous two sections, you must use its qualified name to specify a value or type that is not defined in the current module. This can quickly become tedious because some qualified names can be quite long. Fortunately, F# provides the open directive, so you can use simple names for types and values. You follow the open keyword by the name of the namespace or module you want to open. For example, consider this code: System.Console.WriteLine("Hello world") You could replace the preceding code with this:

The perfect Windows application would make it impossible for the user to enter any syntactically invalid information; this is achieved by using the right set of controls, checking key presses, and limiting choices. Of course, sometimes this task is too daunting and you need to settle on the next best thing, which is checking for errors after the fact. If you take this approach, it s important that you report any error as soon as possible, preferably before the user continues to enter more information. The easiest way is to react to validation events. Validation events are designed to let you check information as soon as it is entered, rather than waiting for the whole form to be submitted. This kind of instantaneous error-checking is very useful, for the following reasons: Without it, users might be afraid to submit a form because they know there is a possible error. Users might enter several pieces of invalid data at the same time. If you don t check the data until the form is submitted, your program will have to find some way to report all the mistakes at once. By the time users submit a form, they might have already forgotten about the particular field they entered incorrectly. The validation events avoid these problems by checking the field as soon as the user is finished entering information in it and changes focus to another control (either to enter new information, like choosing a text box, or to perform an action, like clicking a button).

13.

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