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change from what we saw in chapter 13 when creating our original toolbar is that the Save, Previous, and Next buttons must operate on the active child form, rather than the parent form. The ActiveMdiChild property in the Form class is used to identify the active child for a form. We will use this to implement our toolbar buttons in the parent form. We will also use the C# internal keyword here to expose some of our MenuItem objects in the MainForm class to other classes in our assembly, and in particular to our ParentForm class. This keyword is an access modifier like public or protected, and permits any other class in the same assembly to have access to the class member. Let s see how these constructs are used by creating the Toolbar control for our parent form. Since toolbars were discussed in chapter 13, we will simply highlight the required changes without too much detailed discussion.

CREATE A TOOLBAR IN THE PARENT FORM Action 3 Add an ImageList called imageListParent to the ParentForm class in the ParentForm.cs [Design] window. 4 Add the following images to the Images property of this list: bitmaps/OffCtlBr/Small/Color/ NEW.BMP bitmaps/OffCtlBr/Small/Color/ OPEN.BMP bitmaps/OffCtlBr/Small/Color/ SAVE.BMP icons/arrows/ARW08LT.ICO icons/arrows/ARW08RT.ICO 5 Add a ToolBar control to the ParentForm class.

It is tempting to focus on the more object-oriented (3D model), rather than the processoriented, aspects of the BIM specifications, even though it is ultimately the process that determines the requirements (characteristics) of the model objects For example, if the exact size and location of concrete slab pours in a construction sequence is being studied, the slab sections will need to be modeled exactly as they are anticipated for the concrete pours, so that they can be properly represented in the construction sequence This may require close collaboration between the modeler and the construction superintendent, and it could take several modeling sessions to optimize the pour sequence for the slab If a cost estimate is desired, a deliberate choice of model components will have to be planned (with the appropriate level of detail) to represent the project in the cost estimate In other words, it is more important to establish the various processes that need to be addressed first, before becoming distracted with the actual modeling itself The planning discussion is divided into three parts: first, the analysis of the purpose of the BIM, next, the development of the specifications required to achieve the desired results, and finally the implementation plan for the steps that are necessary to meet the chosen specifications

Now that the controls are on the form, we can load an image into the PictureBox control using the OpenFileDialog class. Up until this point we really haven t typed any C# code for our MyPhotos application. We simply set values via Visual Studio and let the environment do the work on our behalf. In this section we finally get our hands dirty. The result of our labors will allow a file to be selected as shown in figure 2.2.

It s a fact: video games are not yet respectable We may be a multibillion dollar business that employs hundreds of thousands of people worldwide, and be the fastest-growing (and by some measures, the most enjoyable) entertainment medium in America, but to a lot of people we re still just kid s stuff The game industry is full of young people,

Figure 2.2 The dialog used to select a file in our application. This dialog is created using the OpenFileDialog class.

There are a couple of topics worth discussing here. First we will discuss how to support the dialog shown in figure 2.2. Then we will discuss how to handle the case where the user selects an invalid file. 2.3.1 Event handlers in Visual Studio .NET As discussed in chapter 1, an event is a predefined action that a program can respond to, such as a user clicking a button or resizing a window. In chapter 1 we handled the event that occurs when the user clicks on the Load button. Here we will do the same using Visual Studio rather than a text editor. As before, the Load button handler will allow the user to select a file and then load a Bitmap image of the file into our PictureBox control. If you recall, this involves GETTING STARTED WITH VISUAL STUDIO .NET

setting a Click event handler for the button and using the OpenFileDialog class to prompt the user for an image to load. Let s duplicate our code from chapter 1 in Visual Studio. Our code for the event handler will be identical to that already shown and discussed, so if you skipped ahead and missed this discussion, go back to chapter 1