.NET (Core and Framework)

If there are three people walking with me, one of them can be my teacher.

[Andy]

• every event handler;
• every AsyncCallback method;
• every ThreadStart and WaitCallback method;
• every utility class used to pass state to a thread;
• etc...

public class SimpleForm : Form
{
    private TextBox _textbox;
    ...
    
    private void textbox_TextChanged(object sender, EventArgs e)
    {
        // Do something here
    }
    
    public string TheText
    {
        get { return _textbox.Text; }
    }
}

public class SimpleForm : Form
{
    private TextBox _textbox;
    ...
    
    public void textbox_TextChanged(object sender, EventArgs e)
    {
        // Check to make sure this method is being called
        // from the event on the textbox, and not a user
        // trying to find out what this method does.
        if ( ... )
        {
            // Do something here
        }
    }
    
    public string TheText
    {
        get { return _textbox.Text; }
    }
}