>I have a form with a single button on it. In the click event i have the following code: MessageBox.Show("Hello, World!");
>
>The code does not work. How do I get my application to say hello?

How did you create the event handler? To code it yourself its:just

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.button1.Click += new System.EventHandler(this.button1_Click);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Hello World");
        }
    }

If you created the handler by doubleclicking on the button (or from the Properties window) then the

this.button1.Click += new System.EventHandler(this.button1_Click);

line would be automatically added to the InitializeComponent() method - you can check this by looking in the Form1.Designer.cs file (all this assuming your form IS called Form1 of course)