TrackBar.ValueChanged Event


Occurs when the Value property of a track bar changes, either by movement of the scroll box or by manipulation in code.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public event EventHandler ValueChanged

You can use this event to update other controls when the value represented in the track bar changes.

For more information about handling events, see Handling and Raising Events.

The following code example demonstrates how to use the TickStyle, Minimum, and Maximum members and how to handle the ValueChanged event. To run the example, paste the following code into a form that contains a TrackBar control name TrackBar1 and a TextBox control named TextBox1. Call the InitializeTrackBar method from the form's constructor or Load event-handling method.

//Declare a new TrackBar object.
internal System.Windows.Forms.TrackBar TrackBar1;

// Initalize the TrackBar and add it to the form.
private void InitializeTrackBar()
	this.TrackBar1 = new System.Windows.Forms.TrackBar();
	TrackBar1.Location = new System.Drawing.Point(75, 30);

	// Set the TickStyle property so there are ticks on both sides
	// of the TrackBar.
	TrackBar1.TickStyle = TickStyle.Both;

	// Set the minimum and maximum number of ticks.
	TrackBar1.Minimum = 10;
	TrackBar1.Maximum = 100;

	// Set the tick frequency to one tick every ten units.
	TrackBar1.TickFrequency = 10;

	// Associate the event-handling method with the 
	// ValueChanged event.
	TrackBar1.ValueChanged += 
		new System.EventHandler(TrackBar1_ValueChanged);

// Handle the TrackBar.ValueChanged event by calculating a value for
// TextBox1 based on the TrackBar value.  
private void TrackBar1_ValueChanged(object sender, System.EventArgs e)
	TextBox1.Text = (System.Math.Round(TrackBar1.Value/10.0)).ToString();

.NET Framework
Available since 1.1
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