.net C# listbox的全选，反选和全不选

//全选方法一
        private void SelectAll(ListBox ListBox)
        ...{
            for (int i = 0; i < ListBox.Items.Count; i++)
            ...{

                ListBox.SelectedIndex = i;
            }   
        }
        //全选方法一和全不选
        private void SelectAll(ListBox ListBox,bool b)
        ...{
            for (int i = 0; i < ListBox.Items.Count; i++)
            ...{

                ListBox.SetSelected(i, b);
            }
        }
        //反选
        private void unSelectAll(ListBox ListBox)
        ...{
            bool b;
            for (int i = 0; i < ListBox.Items.Count; i++)
            ...{

                b = !ListBox.GetSelected(i);
                ListBox.SetSelected(i, b);
            }
        }
 //by 闫磊 Email:[e-mail],[e-mail] 2007.10.10