Programming the Button Control

Programming the Button Control

The System.Windows.Forms.Button class is the .NET implementation of a button control. When the user clicks the button with the stylus, a Click event is raised. You can handle this event by implementing a System.EventHandler delegate. The code that follows is an implementation of the EventHandler that displays the current time.

 C# Private void button_Click(object sender, System.EventArgs e) {   MessageBox.Show(DateTime.Now.ToShortTimeString(),                 "The Current Time Is",                 MessageBoxButtons.OK,                 MessageBoxIcon.Exclamation,                 MessageBoxDefaultButton.Button1); } VB Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click   MessageBox.Show(DateTime.Now.ToShortTimeString(),     "The Current Time Is",     MessageBoxButtons.OK,     MessageBoxIcon.Exclamation,     MessageBoxDefaultButton.Button1) End Sub 

Figure 3.6 shows the GiveEmTime.exe running on the Pocket PC emulator. The button labeled What is the Time has been clicked, and the current time is being displayed in the dialog box.

Figure 3.6. The GiveEmTime application running on the Pocket PC 2002 emulator.

Table 3.4. The KeyCodes Generated by the Directional Pad on a Pocket PC Device

KeyCode VALUE	ASSOCIATED HARDWARE BUTTON
Keys.Up	The top of the pad was pressed.
Keys.Down	The bottom of the pad was pressed.
Keys.Left	The left side of the pad was pressed.
Keys.Right	The right side of the pad was pressed.
Keys.Return	The center of the pad was pressed.