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The rest of the class overrides the methods in BindingList that control alteration of the collection. Each override checks the IsReadOnly property and throws an exception when an attempt is made to change the collection when it is in read-only mode. The only complicated overrides are ClearItems() and RemoveItem(). This is because AllowRemove is typically set to false and must be temporarily changed to true to allow the operation (when the collection is not in read-only mode). For instance, here s the ClearItems() method: protected override void ClearItems() { if (!IsReadOnly) { bool oldValue = AllowRemove; AllowRemove = true; base.ClearItems(); AllowRemove = oldValue; } else throw new NotSupportedException(Resources.ClearInvalidException); } The original AllowRemove value is restored after the operation is complete. This completes all the types in the Csla.Core namespace. The rest of the implementation is available in the code download for the book. Let s move on and discuss the types in the Csla. Validation namespace.

Likewise, you can define functions to place the representation in various normal forms. For example, the following function computes negation normal form (NNF), where all instances of NOT nodes have been pushed to the leaves of the representation: let rec nnf sign prop = match prop with | And(p1,p2) -> if sign then And(nnf sign p1, nnf sign p2) else Or(nnf sign p1, nnf sign p2) | Or(p1,p2) -> if sign then Or(nnf sign p1, nnf sign p2) else And(nnf sign p1, nnf sign p2) | Not(p) -> nnf (not sign) p | Var(_) | True -> if sign then prop else Not(prop) let NNF prop = nnf true prop

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The Csla.Validation namespace contains types that assist the business developer in implementing and enforcing business rules. The Csla.Core.BusinessBase class, discussed earlier in the BusinessBase Class section, illustrated how some of the functionality in the Csla.Validation namespace will be used. This includes managing a list of business rules for each of the object s properties and for maintaining a list of currently broken business rules. Obviously, the framework can t implement the actual business rules and validation code that will vary from application to application. However, business rules follow a very specific pattern in that they are either broken or not. The result of a rule being checked is a Boolean value and a humanreadable description of why the rule is broken. This makes it possible to check the rules and then maintain a list of broken rules including human-readable descriptions of each rule.

let form = new Form(Text="Web Browser", Size=new Size(800, 600)) form.Controls.Add(toolbar) form.Controls.Add(status) form.Controls.Add(browser) form.PerformLayout() form.Show() To compile the application rather than execute it interactively, add the following at the end, as mentioned previously: Application.Run(form)

Given that rules follow a specific pattern, it is possible to define a method signature that covers virtually all business rules. In .NET, a method signature can be formally defined using a delegate; here s the definition for a rule method: public delegate bool RuleHandler(object target, RuleArgs e); Every rule is implemented as a method that returns a Boolean result: true if the rule is satisfied, false if the rule is broken. The object containing the data to be validated is passed as the first argument, and the second argument is a RuleArgs object that can be used to pass extra rule-specific information. This means that a business rule in a business class looks like this:

What this chapter covers: A quick look at the old-school techniques: document.write and innerHTML An in-depth look at the DOM methods createElement, createTextNode, appendChild, and insertBefore An introduction to Ajax and asynchronous requests

It is possible to see the form growing interactively using fsi.exe. Usually applications first configure forms and controls and then call Show to present the user with a form ready to use. It is also useful to set the properties TopMost=true and Visible=true. The properties of a form can also be set after it is visible, allowing you to see the effects of each operation on it. F# Interactive offers a unique opportunity of watching the form growing interactively; you can, for instance, build the interface of the simple web browser by showing the form immediately and then proceed to add controls and set their properties. Thus, you can experiment with the various properties of controls and see how they affect the interface.

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