private void btnFill1_Click(object sender, System.EventArgs e) 
{
   AddItems();
}

private void AddItems()
{        
        try 
		{
            // Remove existing items from the control.
            lstProcessesAddItem.Items.Clear();
            // Fill the control. Indicate which member of 
            // the items added to the list box should be
            // displayed.
            lstProcessesAddItem.DisplayMember = "ProcessName";
            foreach(Process prc in Process.GetProcesses() )
				{
                lstProcessesAddItem.Items.Add(prc);
            }
            lstProcessesAddItem.Sorted = true;			
       } 
	    catch(Exception exp)
	    {
            MessageBox.Show(exp.Message, this.Text);
            }

}