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At the center of UML there are many diagrams. In this book I ll cover just the most important ones: Use case Sequence Class Activity

In the previous example, you saw how to use actions to change properties However, for this approach to work, you must hardcode the property values in your Atlas script A more interesting example is to set the property using dynamic values that is, values drawn from other controls on the page To do this with Atlas, you need to use bindings Bindings are a solution for managing the flow of information between controls and other components Essentially, a binding connects one object to another When a specific event occurs, the data is copied from the first object to the second For example, imagine you want to modify the previous example so the first and last names you enter appear in the label.

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System.Object as the first parameter and a System.EventArgs as the second. Here, you use a lambda expression to terminate the entire application with the static Application.Exit() method. Once you recompile and execute this application, you will find your simple window sports a custom menu system (see Figure A-3).

One way to do this is to create two <span> elements, one for each piece of bound information: <p><span id="spanFirst"></span> <span id="spanLast"></span></p> Now you can fill the two <span> elements by binding them to the text values in the two text boxes Here s the Atlas script you need: <label id="spanFirst"> <bindings> <binding dataContext="txtFirst" dataPath="text" property="text" /> </bindings> </label> <label id="spanLast"> <bindings> <binding dataContext="txtLast" dataPath="text" property="text" /> </bindings> </label> The minimum information you need to supply for a binding includes the source object (dataContext), the property of the source object that has the data you want (dataPath), and the property in the target object where you want to copy the value (text) By default, the target object is the parent element in this case, the label This binding is known as an in binding, because information is copied into the control that s designated by the parent element.

System.EventHandler is one of many delegate types used within the Windows Forms (and ASP.NET) APIs during the event-handling process. As you have seen, this delegate can only point to methods where the first argument is of type System.Object, which is a reference to the object that sent the event. For example, assume you want to update the implementation of the lambda expression, as follows: mnuFileExit.Click += (o, s) => { MessageBox.Show(string.Format("{0} sent this event", o.ToString())); Application.Exit(); }; You can verify that the mnuFileExit type sent the event because the string is displayed within the message box: "E&xit sent this event" You might be wondering what purpose the second argument, System.EventArgs, serves. In reality, the System.EventArgs type brings little to the table because it simply extends Object and provides practically nothing by way of addition functionality: public class EventArgs { public static readonly EventArgs Empty; static EventArgs(); public EventArgs(); } However, this type is useful in the overall scheme of .NET event handling because it is the parent to many (useful) derived types. For example, the MouseEventArgs type extends EventArgs to provide details regarding the current state of the mouse. KeyEventArgs also extends EventArgs to provide details of the

However, you could also apply an out binding in the text box The following Atlas markup is equivalent to the previous example: <textBox id="txtFirst"> <bindings> <binding dataContext="spanFirst" dataPath="text" property="text" direction="Out" /> </bindings> </textBox> <textBox id="txtLast"> <bindings> <binding dataContext="spanLast" dataPath="text" property="text" direction="Out" /> </bindings> </textBox>.

state of the keyboard (such as which key was pressed); PaintEventArgs extends EventArgs to yield graphically relevant data; and so forth. You can also see numerous EventArgs descendents (and the delegates that make use of them) not only when working with Windows Forms, but when working with the WPF and ASP.NET APIs, as well. While you could continue to build more functionality into your MainWindow (e.g., status bars and dialog boxes) using a simple text editor, you would eventually end up with hand cramps because you have to author all the grungy control configuration logic manually. Thankfully, Visual Studio 2010 provides numerous integrated designers that take care of these details on your behalf. As you use these tools during the remainder of this chapter, always remember that these tools authoring everyday C# code; there is nothing magical about them whatsoever.

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