Implement Observer Pattern in an Absolutely Easy Example

namespace EventAndDelegate
{
    partial class Form2
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.rdRed = new System.Windows.Forms.RadioButton();
            this.rdGreen = new System.Windows.Forms.RadioButton();
            this.rdBlue = new System.Windows.Forms.RadioButton();
            this.lblText = new System.Windows.Forms.Label();
            this.btnOpen = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // rdRed
            // 
            this.rdRed.AutoSize = true;
            this.rdRed.Location = new System.Drawing.Point(13, 37);
            this.rdRed.Name = "rdRed";
            this.rdRed.Size = new System.Drawing.Size(45, 17);
            this.rdRed.TabIndex = 0;
            this.rdRed.TabStop = true;
            this.rdRed.Text = "Red";
            this.rdRed.UseVisualStyleBackColor = true;
            this.rdRed.CheckedChanged += new System.EventHandler(this.rdRed_CheckedChanged);
            // 
            // rdGreen
            // 
            this.rdGreen.AutoSize = true;
            this.rdGreen.Location = new System.Drawing.Point(12, 60);
            this.rdGreen.Name = "rdGreen";
            this.rdGreen.Size = new System.Drawing.Size(54, 17);
            this.rdGreen.TabIndex = 1;
            this.rdGreen.TabStop = true;
            this.rdGreen.Text = "Green";
            this.rdGreen.UseVisualStyleBackColor = true;
            this.rdGreen.CheckedChanged += new System.EventHandler(this.rdGreen_CheckedChanged);
            // 
            // rdBlue
            // 
            this.rdBlue.AutoSize = true;
            this.rdBlue.Location = new System.Drawing.Point(12, 83);
            this.rdBlue.Name = "rdBlue";
            this.rdBlue.Size = new System.Drawing.Size(46, 17);
            this.rdBlue.TabIndex = 2;
            this.rdBlue.TabStop = true;
            this.rdBlue.Text = "Blue";
            this.rdBlue.UseVisualStyleBackColor = true;
            this.rdBlue.CheckedChanged += new System.EventHandler(this.rdBlue_CheckedChanged);
            // 
            // lblText
            // 
            this.lblText.AutoSize = true;
            this.lblText.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.lblText.Location = new System.Drawing.Point(109, 50);
            this.lblText.Name = "lblText";
            this.lblText.Size = new System.Drawing.Size(149, 29);
            this.lblText.TabIndex = 3;
            this.lblText.Text = "Sample Text";
            // 
            // btnOpen
            // 
            this.btnOpen.Location = new System.Drawing.Point(210, 102);
            this.btnOpen.Name = "btnOpen";
            this.btnOpen.Size = new System.Drawing.Size(97, 23);
            this.btnOpen.TabIndex = 4;
            this.btnOpen.Text = "Open Child Form";
            this.btnOpen.UseVisualStyleBackColor = true;
            this.btnOpen.Click += new System.EventHandler(this.btnOpen_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(9, 9);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(298, 13);
            this.label1.TabIndex = 5;
            this.label1.Text = "Open child form then check the radio buttons to see the result";
            // 
            // Form2
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(308, 125);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.btnOpen);
            this.Controls.Add(this.lblText);
            this.Controls.Add(this.rdBlue);
            this.Controls.Add(this.rdGreen);
            this.Controls.Add(this.rdRed);
            this.Name = "Form2";
            this.Text = "Form2";
            this.Load += new System.EventHandler(this.Form2_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.RadioButton rdRed;
        private System.Windows.Forms.RadioButton rdGreen;
        private System.Windows.Forms.RadioButton rdBlue;
        private System.Windows.Forms.Label lblText;
        private System.Windows.Forms.Button btnOpen;
        private System.Windows.Forms.Label label1;
    }
}