Csharp/C Sharp/GUI Windows Form/Track Bar

Use TrackBar to control label color

<source lang="csharp">

 using System;
 using System.Drawing;
 using System.Collections;
 using System.ruponentModel;
 using System.Windows.Forms;
 using System.Data;
 public class TrackForm : System.Windows.Forms.Form
 {
   private System.Windows.Forms.Label label4;
   private System.Windows.Forms.Label label2;
   private System.Windows.Forms.TrackBar blueTrackBar;
   private System.Windows.Forms.Label label3;
   private System.Windows.Forms.TrackBar greenTrackBar;
   private System.Windows.Forms.TrackBar redTrackBar;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.Panel panel1;
   private System.Windows.Forms.Label lblCurrColor;
   private System.Windows.Forms.PictureBox colorBox;
   public TrackForm()
   {
     InitializeComponent();
     CenterToScreen();         
 
     redTrackBar.Value = 0;
     greenTrackBar.Value = 0;
     blueTrackBar.Value = 0;
     UpdateColor();
   }
   private void InitializeComponent()
   {
     this.label4 = new System.Windows.Forms.Label ();
     this.label1 = new System.Windows.Forms.Label ();
     this.label3 = new System.Windows.Forms.Label ();
     this.label2 = new System.Windows.Forms.Label ();
     this.panel1 = new System.Windows.Forms.Panel ();
     this.redTrackBar = new System.Windows.Forms.TrackBar ();
     this.greenTrackBar = new System.Windows.Forms.TrackBar ();
     this.colorBox = new System.Windows.Forms.PictureBox ();
     this.lblCurrColor = new System.Windows.Forms.Label ();
     this.blueTrackBar = new System.Windows.Forms.TrackBar ();
     redTrackBar.BeginInit ();
     greenTrackBar.BeginInit ();
     blueTrackBar.BeginInit ();
     label4.Location = new System.Drawing.Point (16, 88);
     label4.Text = "Pick your slider here:";
     label4.Size = new System.Drawing.Size (240, 32);
     label4.Font = new System.Drawing.Font ("Microsoft Sans Serif", 15);
     label4.TabIndex = 9;
     label1.Location = new System.Drawing.Point (24, 16);
     label1.Text = "Red:";
     label1.Size = new System.Drawing.Size (88, 32);
     label1.Font = new System.Drawing.Font ("Arial", 15);
     label1.TabIndex = 4;
     label3.Location = new System.Drawing.Point (24, 104);
     label3.Text = "Blue:";
     label3.Size = new System.Drawing.Size (88, 32);
     label3.Font = new System.Drawing.Font ("Arial", 15);
     label3.TabIndex = 6;
     label2.Location = new System.Drawing.Point (24, 64);
     label2.Text = "Green:";
     label2.Size = new System.Drawing.Size (88, 32);
     label2.Font = new System.Drawing.Font ("Arial", 15);
     label2.TabIndex = 5;
     panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
     panel1.Location = new System.Drawing.Point (16, 120);
     panel1.Size = new System.Drawing.Size (384, 188);
     panel1.TabIndex = 8;
     panel1.AutoScroll = true;
     redTrackBar.TickFrequency = 5;
     redTrackBar.Location = new System.Drawing.Point (120, 16);
     redTrackBar.TabIndex = 2;
     redTrackBar.TickStyle = System.Windows.Forms.TickStyle.TopLeft;
     redTrackBar.Maximum = 255;
     redTrackBar.Size = new System.Drawing.Size (232, 42);
     redTrackBar.Scroll += new System.EventHandler (this.redTrackBar_Scroll);
     greenTrackBar.TickFrequency = 5;
     greenTrackBar.Location = new System.Drawing.Point (120, 56);
     greenTrackBar.TabIndex = 3;
     greenTrackBar.TickStyle = System.Windows.Forms.TickStyle.TopLeft;
     greenTrackBar.Maximum = 255;
     greenTrackBar.Size = new System.Drawing.Size (240, 42);
     greenTrackBar.Scroll += new System.EventHandler (this.greenTrackBar_Scroll);
     colorBox.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
     colorBox.BackColor = System.Drawing.Color.Blue;
     colorBox.Location = new System.Drawing.Point (16, 16);
     colorBox.Size = new System.Drawing.Size (384, 56);
     colorBox.TabIndex = 0;
     colorBox.TabStop = false;
     lblCurrColor.Location = new System.Drawing.Point (16, 324);
     lblCurrColor.Text = "label4";
     lblCurrColor.Size = new System.Drawing.Size (392, 40);
     lblCurrColor.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
     lblCurrColor.Font = new System.Drawing.Font ("Microsoft Sans Serif", 14);
     lblCurrColor.TabIndex = 7;
     blueTrackBar.TickFrequency = 5;
     blueTrackBar.Location = new System.Drawing.Point (120, 96);
     blueTrackBar.TabIndex = 1;
     blueTrackBar.TickStyle = System.Windows.Forms.TickStyle.TopLeft;
     blueTrackBar.Maximum = 255;
     blueTrackBar.Size = new System.Drawing.Size (240, 42);
     blueTrackBar.Scroll += new System.EventHandler (this.blueTrackBar_Scroll);
     this.Text = "Color Form";
     this.AutoScaleBaseSize = new System.Drawing.Size (5, 13);
     this.ClientSize = new System.Drawing.Size (424, 385);
     panel1.Controls.Add (this.label2);
     panel1.Controls.Add (this.blueTrackBar);
     panel1.Controls.Add (this.label3);
     panel1.Controls.Add (this.greenTrackBar);
     panel1.Controls.Add (this.redTrackBar);
     panel1.Controls.Add (this.label1);
     this.Controls.Add (this.label4);
     this.Controls.Add (this.panel1);
     this.Controls.Add (this.lblCurrColor);
     this.Controls.Add (this.colorBox);
     redTrackBar.EndInit ();
     greenTrackBar.EndInit ();
     blueTrackBar.EndInit ();
   }
   static void Main() 
   {
     Application.Run(new TrackForm());
   }
   protected void greenTrackBar_Scroll (object sender, System.EventArgs e)
   {
     UpdateColor();
   }
   protected void redTrackBar_Scroll (object sender, System.EventArgs e)
   {
     UpdateColor();
   }
   protected void blueTrackBar_Scroll (object sender, System.EventArgs e)
   {
     UpdateColor();
   }
   private void UpdateColor()
   {
     Color c = Color.FromArgb(redTrackBar.Value, greenTrackBar.Value, blueTrackBar.Value);
     colorBox.BackColor = c;
     lblCurrColor.Text = "Current color is: " + "(" + 
       redTrackBar.Value + ", " + 
       greenTrackBar.Value + " ," +  
       blueTrackBar.Value + ")";
   }
 }

      </source>