private void DownLoadOrder_Click(object sender, EventArgs e)
        {
            if (LoadOrderList.SelectedIndex <= 0 || LoadOrderList.SelectedIndex == LoadOrderList.Items.Count - 1)
            {
                return;
            }

            int Index      = LoadOrderList.SelectedIndex;
            int IndexBelow = Index + 1;

            var item = LoadOrderList.Items[Index]; bool isChecked = LoadOrderList.GetItemChecked(Index);
            var itemBelow = LoadOrderList.Items[IndexBelow]; bool isCheckedBelow = LoadOrderList.GetItemChecked(IndexBelow);

            LoadOrderList.Items[IndexBelow] = item; LoadOrderList.SetItemChecked(IndexBelow, isChecked);
            LoadOrderList.Items[Index]      = itemBelow; LoadOrderList.SetItemChecked(Index, isCheckedBelow);

            LoadOrderList.SelectedIndex++;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (LoadOrderList.SelectedIndex <= 0)
            {
                return;
            }

            int Index = LoadOrderList.SelectedIndex;

            if (LoadOrderList.GetItemChecked(Index) == false)
            {
                LoadOrderList.SetItemChecked(Index, true);
            }
            else
            {
                LoadOrderList.SetItemChecked(Index, false);
            }
        }
        private void UpLoadOrder_Click(object sender, EventArgs e)
        {
            if (LoadOrderList.SelectedIndex <= 1)
            {
                return;
            }

            int Index      = LoadOrderList.SelectedIndex;
            int IndexAbove = Index - 1;

            var item = LoadOrderList.Items[Index]; bool isChecked = LoadOrderList.GetItemChecked(Index);
            var itemAbove = LoadOrderList.Items[IndexAbove]; bool isCheckedAbove = LoadOrderList.GetItemChecked(IndexAbove);

            LoadOrderList.Items[IndexAbove] = item; LoadOrderList.SetItemChecked(IndexAbove, isChecked);
            LoadOrderList.Items[Index]      = itemAbove; LoadOrderList.SetItemChecked(Index, isCheckedAbove);

            LoadOrderList.SelectedIndex--;
        }