Form.Dispose
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; public class FormDispose : System.Windows.Forms.Form { private System.ComponentModel.Container components = null; public FormDispose() { InitializeComponent(); } protected override void Dispose( bool disposing ) { MessageBox.Show("Disposing this Form"); if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.Size = new System.Drawing.Size(300,300); this.Text = "Form1"; } [STAThread] static void Main() { Application.Run(new FormDispose()); } }