Csharp/C Sharp/GUI Windows Form/Track Bar

Use TrackBar to control label color

  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 + ")";
    }
  }