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The System.Windows.Forms namespace contains a number of types that represent common GUI widgets typically used to allow you to respond to user input in a Windows Forms application. Many of the controls you will work with on a day-to-day basis (such as Button, TextBox, and Label) are quite intuitive to work with. Other, more exotic controls and components (such as TreeView, ErrorProvider, and TabControl) require a bit more explanation. As you learned in 19, the System.Windows.Forms.Control type is the base class for all derived widgets. Recall that Control provides the ability to process mouse and keyboard events, establish the physical dimensions and position of the widget using various properties (Height, Width, Left, Right, Location, etc.), manipulate background and foreground colors, establish the active font/cursor, and so forth. As well, the Control base type defines members that control a widget s anchoring and docking behaviors (explained at the conclusion of this chapter). As you read through this chapter, remember that the widgets you examine here gain a good deal of their functionality from the Control base class. Thus, we ll focus (more or less) on the unique members of a given widget. Do understand that this chapter does not attempt to fully describe each and every member of each and every control (that is a task for the .NET Framework 2.0 SDK documentation). Rest assured, though, that once you complete this chapter, you will have no problem understanding the widgets I have not directly described.

Let s create a form for quick data entry for a call center doing a one-minute customer contact. The user s task is to call the customer and find out if they ve heard of the Widget and whether they re interested in finding out more about the product. If the customer is interested, the user will mark that on the form as well so sales can follow up.

Used to specify the indention of the first line of text. Value: <length> | <percentage> Initial value: 0 Inherited: Yes Applies to: Block-level elements Supported by: Firefox, Safari, Opera, Internet Explorer

Windows Forms provide a number of controls that allow you to display relational data (DataGridView, BindingSource, etc.). Some of these data-centric controls are examined in 22 during our discussion of ADO.NET.

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Regardless of which type of control you choose to place on a Form, you will follow an identical set of steps to do so. First of all, you must define member variables that represent the controls themselves. Next, inside the Form s constructor (or within a helper method called by the constructor), you ll configure the look and feel of each control using the exposed properties, methods, and events. Finally (and most important), once you ve set the control to its initial state, you must add it into the Form s internal controls collection using the inherited Controls property. If you forget this final step, your widgets will not be visible at runtime. To illustrate the process of adding controls to a Form, let s begin by building a Form type wizard-free using your text editor of choice and the C# command-line compiler. Create a new C# file named ControlsByHand.cs and code a new MainWindow class as so: using System; using System.Drawing; using System.Windows.Forms; namespace ControlsByHand { class MainWindow : Form { // Form widget member variables. private TextBox firstNameBox = new TextBox(); private Button btnShowControls = new Button(); public MainWindow() { // Configure Form. this.Text = "Simple Controls"; this.Width = 300; this.Height = 200; CenterToScreen(); // Add a new textbox to the Form. firstNameBox.Text = "Hello"; firstNameBox.Size = new Size(150, 50); firstNameBox.Location = new Point(10, 10); this.Controls.Add(firstNameBox); // Add a new button to the Form. btnShowControls.Text = "Click Me"; btnShowControls.Size = new Size(90, 30); btnShowControls.Location = new Point(10, 70); btnShowControls.BackColor = Color.DodgerBlue; btnShowControls.Click += new EventHandler(btnShowControls_Clicked); this.Controls.Add(btnShowControls); }

// Handle Button's Click event. private void btnShowControls_Clicked(object sender, EventArgs e) { // Call ToString() on each control in the // Form's Controls collection string ctrlInfo= ""; foreach (Control c in this.Controls) { ctrlInfo += string.Format("Control: {0}\n", c.ToString()); } MessageBox.Show(ctrlInfo, "Controls on Form"); } } } Now, add a second class to the ControlsByHand namespace that implements the program s Main() method: class Program { public static void Main(string[] args) { Application.Run(new MainWindow()); } } At this point, compile your C# file at the command line using the following command: csc /target:winexe *.cs When you run your program and click the Form s button, you will find a message box that lists each item on the Form (see Figure 21-1).

Used to specify the distance between baselines of lines of text. Value: <factor> | <length> | <percentage> Initial value: Determined by user agent Inherited: Yes Applies to: All elements Supported by: Firefox, Safari, Opera, Internet Explorer

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