Form.MouseUp
using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; public class FormMouseUpEvent : System.Windows.Forms.Form { private System.ComponentModel.Container components = null; public FormMouseUpEvent() { this.MouseUp += new MouseEventHandler(OnMouseUp); InitializeComponent(); } protected override void Dispose( bool disposing ) { 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 FormMouseUpEvent()); } protected void OnMouseUp(object sender, MouseEventArgs e) { // Which mouse button was clicked? if(e.Button == MouseButtons.Left) MessageBox.Show("Left click!"); if(e.Button == MouseButtons.Right) MessageBox.Show("Right click!"); if(e.Button == MouseButtons.Middle) MessageBox.Show("Middle click!"); } }