label.MouseDown += new MouseEventHandler(lab_MouseDown);
 
label.MouseDoubleClick += new MouseEventHandler(lab_MouseDoubleClick);
 
private void lab_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.Text += "  double click";
        }
 
        private void lab_MouseDown(object s , MouseEventArgs e)
        {
            this.Text  += " mouse doen";
        }

this.label1.MouseDown += new MouseEventHandler(this.label1_MouseDown);
this.label1.MouseDown += new MouseEventHandler(this.label1_DoubleClick);

private void label1_DoubleClick(object sender, MouseEventArgs e)
{
    this.label1.Text += " double_click";
}

private void label1_MouseDown(object sender, MouseEventArgs e)
{
    this.label1.Text += " mouse_Down";
}

String str=String.Empty;
 private void label1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            str += "label1_MouseDoubleClick";
            label1.Text = str;
        }
 
        private void label1_MouseDown(object sender, MouseEventArgs e)
        {   str +="label1_MouseDown";
            label1.Text = str;
        }