Form Window event : Form Event : GUI Windows Form C# Source Code

    
 

using System;
using System.Windows.Forms;
using System.ComponentModel;

public class MainWindow : Form {
    private string lifeTimeInfo;
    public MainWindow() {
        this.Closing += new CancelEventHandler(MainForm_Closing);
        this.Load += new EventHandler(MainForm_Load);
        this.Closed += new EventHandler(MainForm_Closed);
        this.Activated += new EventHandler(MainForm_Activated);
        this.Deactivate += new EventHandler(MainForm_Deactivate);
    }

    protected void MainForm_Closing(object sender, CancelEventArgs e) {
        DialogResult dr = MessageBox.Show("Do you REALLY want to close this app?",
             "Closing event!", MessageBoxButtons.YesNo);
        if (dr == DialogResult.No)
            e.Cancel = true;
        else
            e.Cancel = false;
    }

    protected void MainForm_Load(object sender, System.EventArgs e) { 
        lifeTimeInfo += "Load event\n"; 
    }
    protected void MainForm_Activated(object sender, System.EventArgs e) { 
        lifeTimeInfo += "Activate event\n"; 
    }
    protected void MainForm_Deactivate(object sender, System.EventArgs e) { 
        lifeTimeInfo += "Deactivate event\n"; 
    }
    protected void MainForm_Closed(object sender, System.EventArgs e) {
        lifeTimeInfo += "Closed event\n";
        MessageBox.Show(lifeTimeInfo);
    }
    public static void Main(string[] args) {
        Application.Run(new MainWindow());
    }
}