两个ComboBox之间Item的移动

        /// <summary>
        /// 绑定权限列表的数据
        /// </summary>
        /// <param name="roleID">-1则,不获取权限列表的数据</param>
        private void DataBindCB(int roleID)
        {
            DataTable dtbPermission = PermissionDAL.GetList();
            DataTable dtbPermissionList = PermissionListDAL.GetList(roleID);
            if (dealTypeCur == DealType.Edit) permissionListOld = new List<int>();

            foreach (DataRow dr in dtbPermissionList.Rows)
            {
                if (dealTypeCur == DealType.Edit) permissionListOld.Add(Convert.ToInt32(dr["PermissionID"]));

                DataRow[] drCur = dtbPermission.Select("PermissionID=" + dr["PermissionID"].ToString());
                if (drCur.Length > 0)
                {
                    dtbPermission.Rows.Remove(drCur[0]);
                }
            }

            cbPermissionUnHas.ValueMember = "PermissionID";
            cbPermissionUnHas.DisplayMember = "Description";
            cbPermissionUnHas.DataSource = dtbPermission;

            cbPermissionHas.ValueMember = "PermissionID";
            cbPermissionHas.DisplayMember = "Description";
            cbPermissionHas.DataSource = dtbPermissionList;
        }

private void btnAddPermission_Click(object sender, EventArgs e)
        {
            //直接操作数据源,防止出现,设置 DataSource 属性后 无法修改项集合
            if (cbPermissionUnHas.SelectedItem == null) return;
            DataTable dtbcbPermissionHasSource = (DataTable)cbPermissionHas.DataSource;
            DataTable dtbcbPermissionUnHasSource = (DataTable)cbPermissionUnHas.DataSource;
            DataRow[] dr = dtbcbPermissionUnHasSource.Select("PermissionID=" + cbPermissionUnHas.SelectedValue.ToString());
            if (dr.Length > 0)
            {
                if (dtbcbPermissionHasSource.Rows.Count == 0)//防止因为没有数据源,而出现无法新建合适的行
                {
                    dtbcbPermissionHasSource.Columns.Add("PermissionID", typeof(int));
                    dtbcbPermissionHasSource.Columns.Add("Description", typeof(string));
                    cbPermissionHas.ValueMember = "PermissionID";//重新绑定数据,避免显示出问题
                    cbPermissionHas.DisplayMember = "Description";
                }
                DataRow drNew = dtbcbPermissionHasSource.NewRow();
                drNew["PermissionID"] = dr[0]["PermissionID"];
                drNew["Description"] = dr[0]["Description"];
                dtbcbPermissionUnHasSource.Rows.Remove(dr[0]);
                dtbcbPermissionHasSource.Rows.Add(drNew);
            }
        }

        private void btnRemovePermission_Click(object sender, EventArgs e)
        {
            if (cbPermissionHas.SelectedItem == null) return;
            DataTable dtbcbPermissionHasSource = (DataTable)cbPermissionHas.DataSource;
            DataTable dtbcbPermissionUnHasSource = (DataTable)cbPermissionUnHas.DataSource;
            DataRow[] dr = dtbcbPermissionHasSource.Select("PermissionID=" + cbPermissionHas.SelectedValue.ToString());
            if (dr.Length > 0)
            {
                if (dtbcbPermissionUnHasSource.Rows.Count == 0)
                {
                    dtbcbPermissionHasSource.Columns.Add("PermissionID", typeof(int));
                    dtbcbPermissionUnHasSource.Columns.Add("Description", typeof(string));
                    cbPermissionUnHas.ValueMember = "PermissionID";
                    cbPermissionHas.DisplayMember = "Description";
                }
                DataRow drNew = dtbcbPermissionUnHasSource.NewRow();
                drNew["PermissionID"] = dr[0]["PermissionID"];
                drNew["Description"] = dr[0]["Description"];
                dtbcbPermissionHasSource.Rows.Remove(dr[0]);
                dtbcbPermissionUnHasSource.Rows.Add(drNew);
            }
        }