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Now let s make this class do some work. First let s add some validation code. We cannot save the record if the State and PhoneNumber properties do not contain data. Add a new function called ValidateData and type in the following code:

The TrackBar control allows users to select from a range of values, using a scroll bar like input mechanism. When working with this type, you need to set the minimum and maximum range, the minimum and maximum change increments, and the starting location of the slider s thumb. Each of these aspects can be set using the properties described in Table 21-6. Table 21-6. TrackBar Properties

Note In Internet Explorer 6 and lower, border-style is not implemented for row groups and the dotted

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The number of ticks by which the TrackBar changes when an event considered a large change occurs (e.g., clicking the mouse button while the cursor is on the sliding range and using the Page Up or Page Down key). Configure the upper and lower bounds of the TrackBar s range. The orientation for this TrackBar. Valid values are from the Orientation enumeration (i.e., horizontally or vertically). The number of ticks by which the TrackBar changes when an event considered a small change occurs (e.g., using the arrow keys). Indicates how many ticks are drawn. For a TrackBar with an upper limit of 200, it is impractical to draw all 200 ticks on a control 2 inches long. If you set the TickFrequency property to 5, the TrackBar draws 20 total ticks (each tick represents 5 units). Indicates how the TrackBar control draws itself. This affects both where the ticks are drawn in relation to the movable thumb and how the thumb itself is drawn (using the TickStyle enumeration). Gets or sets the current location of the TrackBar. Use this property to obtain the numeric value contained by the TrackBar for use in your application.

To illustrate, you ll update the first tab of your TabControl with three TrackBars, each of which has an upper range of 255 and a lower range of 0. As the user slides each thumb, the application intercepts the Scroll event and dynamically builds a new System.Drawing.Color type based on the value of each slider. This Color type will be used to display the color within a PictureBox widget (named colorBox) and the RGB values within a Label type (named lblCurrColor). Figure 21-18 shows the (completed) first page in action.

First, place three TrackBars onto the first tab using the Forms designer and rename your member variables with an appropriate value (redTrackBar, greenTrackBar, and blueTrackBar). Next, handle the Scroll event for each of your TrackBar controls. Here is the relevant code within InitializeComponent() for blueTrackBar (the remaining bars look almost identical, with the exception of the name of the Scroll event handler): private void InitializeComponent() { ... // // blueTrackBar // this.blueTrackBar.Maximum = 255; this.blueTrackBar.Name = "blueTrackBar"; this.blueTrackBar.TickFrequency = 5; this.blueTrackBar.TickStyle = System.Windows.Forms.TickStyle.TopLeft; this.blueTrackBar.Scroll += new System.EventHandler(this.blueTrackBar_Scroll); ... } Note that the default minimum value of the TrackBar is 0 and thus does not need to be explicitly set. In the Scroll event handlers for each TrackBar, you make a call to a yet-to-be-written helper function named UpdateColor(): private void blueTrackBar_Scroll (object sender, EventArgs e) { UpdateColor(); } UpdateColor() is responsible for two major tasks. First, you read the current value of each TrackBar and use this data to build a new Color variable using Color.FromArgb(). Once you have the newly configured color, update the PictureBox member variable (again, named colorBox) with the current background color. Finally, UpdateColor() formats the thumb values in a string placed on the Label (lblCurrColor), as shown here: private void UpdateColor() { // Get the new color based on track bars. Color c = Color.FromArgb(redTrackBar.Value, greenTrackBar.Value, blueTrackBar.Value); // Change the color in the PictureBox. colorBox.BackColor = c; // Set color label. lblCurrColor.Text = string.Format("Current color is: (R:{0}, G:{1}, B:{2})", redTrackBar.Value, greenTrackBar.Value, blueTrackBar.Value); } The final detail is to set the initial values of each slider when the Form comes to life and render the current color, as shown here: public MainWindow() { InitializeComponent(); CenterToScreen(); // Set initial position of each slider. redTrackBar.Value = 100; greenTrackBar.Value = 255;

value is not supported when the border-width is 1px (dashed is displayed instead).

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