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The Controls property The final lines in the MyForm constructor add the button and picture box controls to the form using the Controls property. The Controls property returns an instance of the Control.ControlCollection class. The ControlCollection class is defined within the Form class, and defines an Add method that adds a control to a form. Note that the Controls property can be used to retrieve the controls on a form as well.

public MyForm() { . . . // Add our new controls to the Form this.Controls.Add(btnLoad); this.Controls.Add(pboxPhoto); }

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Constructor modeling team Creating an architectural model Revit modeling team Creating an architectural model Tekla modeling team Creating a structural model The construction of a virtual structural system that addresses all possible levels of detail HVAC modeling team Creating a model of the HVAC system, probably in Constructor but perhaps in another software package Simulating the HVAC and possibly plumbing and electrical systems for a structure Various levels of detail are possible

When a control is added to a form, it is placed at the end of the z-order of the stack of controls on the form. The term z-order is used for both the set of forms in the application and the set of controls on a particular form, and indicates the order of windows stacked on the screen or controls stacked on a form, much like stacking dishes on a table. The end of the z-order is bottom of the stack. You can think of this as the view a chandelier has of a table. If the tabletop is the form, and a cup and saucer are controls, in your code you would first add the cup control to the table, then add the saucer control so that it appears underneath the cup. This can be a bit unintuitive, so make sure you understand this point when programmatically adding controls to your forms. The term z-order comes from the fact that the screen is two-dimensional, and is often treated as a two-axis coordinate system in the X and Y directions. The imaginary axis perpendicular to the screen is called the z-axis. This concept of z-order will be important later in the chapter when we have overlapping controls. Now that our controls are placed on the form, we can use them to load and display an image.

The next change to our little program will permit the user to click the Load button and display a selected file in the picture box control. The result appears in figure 1.4, and looks very much like our previous screen, with the addition of the selected image.

Figure 1.4 The image loaded into the PictureBox control here is stretched to exactly fit the control s display area.

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Revise your program in accordance with listing 1.3. Once again the changes are shown in bold type, and the version number has been incremented, this time to 1.3.

[assembly: System.Reflection.AssemblyVersion("1.3")] namespace MyNamespace { using System; using System.Drawing; using System.Windows.Forms; public class MyForm : System.Windows.Forms.Form { Button btnLoad; PictureBox pboxPhoto; public MyForm() { this.Text = "Hello Form 1.3"; // Create and configure the Button btnLoad = new Button(); btnLoad.Text = "&Load"; btnLoad.Left = 10; btnLoad.Top = 10; btnLoad.Click += new System.EventHandler(this.OnLoadClick); // Create and configure the PictureBox pboxPhoto = new PictureBox(); pboxPhoto.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D; pboxPhoto.Width = this.Width / 3; pboxPhoto.Height = this.Height / 3; pboxPhoto.Left = (this.Width - pboxPhoto.Width) / 2; pboxPhoto.Top = (this.Height - pboxPhoto.Height) / 2; pboxPhoto.SizeMode = PictureBoxSizeMode.StretchImage;

Site modeling team Creating a model of the setting of the project, including the underground work and temporary facilities for the construction process, landscaping, etc

// Add our new controls to the Form this.Controls.Add(btnLoad); this.Controls.Add(pboxPhoto); } private void OnLoadClick(object sender, System.EventArgs e) { OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "Open Photo"; dlg.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*" ; if (dlg.ShowDialog() == DialogResult.OK) { pboxPhoto.Image = new Bitmap(dlg.OpenFile()); } dlg.Dispose(); } public static void Main() { Application.Run(new MyForm()); } } }

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Note that there is a new namespace reference:

using System.Drawing;