using System;
using System.Windows.Forms;
using System.Drawing;
 
public class MyWindow : Form    //derive a class MyWindow from a Form class
{
    Button MyButton = new Button();     //make a new button
    TextBox MyTextBox = new TextBox();  //make a new textbox
 
    public MyWindow() //constructor
    {
        //===================================================================
        //set some properties of this MyWindow form
        this.Text = "Just testing";
        this.BackColor = Color.DeepSkyBlue;
 
        //===================================================================
        //set location,size and text of the newly created button on the form
        MyButton.Location = new Point(100, 100);
        MyButton.Size = new Size(50, 50);
        MyButton.Text = "Do it";
        //hook in a routine to handle click events for MyButton
        MyButton.Click += new EventHandler(MyButton_Click);
        //add the control to the MyWindows forms control collection
        this.Controls.Add(MyButton);
 
        //===================================================================
        //set location,size and text of the newly created textbox on the form
        MyTextBox.Location = new Point(10, 10);
        MyTextBox.Size = new Size(150, 20);
        MyTextBox.Text = "";
        //add the control to the MyWindows forms control collection
        this.Controls.Add(MyTextBox);
 
        //===================================================================
    }
 
    private void MyButton_Click(object Obj, EventArgs EvA)
    {
        //aarghh the ultimate
        //by clicking on our button, set a text in a textbox
        this.MyTextBox.Text = "Hello world!";
    }
 
    private static void Main()
    {
        Application.Run(new MyWindow());    //start the application
    }
}