System.Windows.Forms.ListBox.OnKeyUpLB C# (CSharp) Method

		private void OnKeyUpLB (object sender, KeyEventArgs e)
		{
			switch (e.KeyCode) {
				case Keys.ControlKey:
					ctrl_pressed = false;
					break;
				case Keys.ShiftKey:
					shift_pressed = false;
					break;
				default: 
					break;
			}
		}