TrackBar

This provides a slider control. It allows the user to select a value from the slider by dragging on it. We change many aspects of the TrackBar, including its orientation and appearance.

With the trackbar, we can access the Value property to get a result from the user interaction. We can then use this value elsewhere in the program.

To begin, let's add a TrackBar control. An important event handler on the TrackBar control is the Scroll event handler. To create the Scroll event handler, you can double-click on the TrackBar.

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            // Set the window title text each time a scroll occurs.
            this.Text = "Value: " + trackBar1.Value;
        }
    }
}

Vertical, Horizontal

You may want to use a vertical TrackBar instead of a horizontal TrackBar. You can change the Orientation property to Vertical instead of the default, which is Horizontal.

LargeChange, SmallChange

LargeChange is number of steps taken when the page up or page down keys are pressed, and also when the user clicks where the slider is not located.

The TrackBar can be valuable in some programs. It is a versatile and configurable control and fits well with the concept of Windows Forms as a framework.