List Box click event : ListBox : GUI Windows Form C# Source Code

    

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
{
  private System.Windows.Forms.Label lblSaturation;
  private System.Windows.Forms.Label lblHue;
  private System.Windows.Forms.Label lblBrightness;
  private System.Windows.Forms.Label Label1;
  private System.Windows.Forms.ListBox lstColors;

  public Form1()
  {
    InitializeComponent();
    string[] colorNames  = System.Enum.GetNames(typeof(KnownColor));
    lstColors.Items.AddRange(colorNames);
  }

  private void lstColors_SelectedIndexChanged(object sender, EventArgs e)
  {
    KnownColor selectedColor = (KnownColor)System.Enum.Parse(typeof(KnownColor), lstColors.Text);

    this.BackColor = System.Drawing.Color.FromKnownColor(selectedColor);

    lblBrightness.Text = "Brightness = " + this.BackColor.GetBrightness().ToString();
    lblHue.Text = "Hue = " + this.BackColor.GetHue().ToString();
    lblSaturation.Text = "Saturation = " + this.BackColor.GetSaturation().ToString();
  }

  private void InitializeComponent()
  {
    this.lblSaturation = new System.Windows.Forms.Label();
    this.lblHue = new System.Windows.Forms.Label();
    this.lblBrightness = new System.Windows.Forms.Label();
    this.Label1 = new System.Windows.Forms.Label();
    this.lstColors = new System.Windows.Forms.ListBox();
    this.SuspendLayout();
    // 
    // lblSaturation
    // 
    this.lblSaturation.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
    this.lblSaturation.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    this.lblSaturation.FlatStyle = System.Windows.Forms.FlatStyle.System;
    this.lblSaturation.Location = new System.Drawing.Point(268, 57);
    this.lblSaturation.Name = "lblSaturation";
    this.lblSaturation.Size = new System.Drawing.Size(136, 20);
    this.lblSaturation.TabIndex = 4;
    this.lblSaturation.Text = " Saturation";
    // 
    // lblHue
    // 
    this.lblHue.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
    this.lblHue.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    this.lblHue.FlatStyle = System.Windows.Forms.FlatStyle.System;
    this.lblHue.Location = new System.Drawing.Point(268, 33);
    this.lblHue.Name = "lblHue";
    this.lblHue.Size = new System.Drawing.Size(136, 20);
    this.lblHue.TabIndex = 3;
    this.lblHue.Text = " Hue";
    // 
    // lblBrightness
    // 
    this.lblBrightness.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
    this.lblBrightness.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    this.lblBrightness.FlatStyle = System.Windows.Forms.FlatStyle.System;
    this.lblBrightness.Location = new System.Drawing.Point(268, 9);
    this.lblBrightness.Name = "lblBrightness";
    this.lblBrightness.Size = new System.Drawing.Size(136, 20);
    this.lblBrightness.TabIndex = 2;
    this.lblBrightness.Text = " Brightness";
    // 
    // Label1
    // 
    this.Label1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
    this.Label1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    this.Label1.FlatStyle = System.Windows.Forms.FlatStyle.System;
    this.Label1.Location = new System.Drawing.Point(12, 9);
    this.Label1.Name = "Label1";
    this.Label1.Size = new System.Drawing.Size(200, 20);
    this.Label1.TabIndex = 0;
    this.Label1.Text = " Choose a Background Color:";
    // 
    // lstColors
    // 
    this.lstColors.FormattingEnabled = true;
    this.lstColors.Location = new System.Drawing.Point(12, 37);
    this.lstColors.Name = "lstColors";
    this.lstColors.Size = new System.Drawing.Size(200, 238);
    this.lstColors.TabIndex = 1;
    this.lstColors.SelectedIndexChanged += new System.EventHandler(this.lstColors_SelectedIndexChanged);
    // 
    // Form1
    // 
    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
    this.ClientSize = new System.Drawing.Size(430, 284);
    this.Controls.Add(this.lblSaturation);
    this.Controls.Add(this.lblHue);
    this.Controls.Add(this.lblBrightness);
    this.Controls.Add(this.Label1);
    this.Controls.Add(this.lstColors);
    this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.Name = "Form1";
    this.Text = "Color Changer";
    this.ResumeLayout(false);

  }

  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }

}