MessageBox.Show("用户删除失败 !" + el.Message, "系统提示",

 MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

                return;

            }

        }

   角色授权需要定义几个私有变量：

        private operation oper = new operation();

        //从角色数据文件取出cdbm分解存入的数组

        private string[] ln_cdbm1;

        //此数组存入复选框已选中并赋值cdbm,生成字串存入角色数据文件                                  

        private string[] ln_cdbm2 = new string[1000];

        //ln_cdbm1数组元素总数(也是菜单总数) 

        private int ln_cds;

   角色授权及下拉列表框事件代码中需要调用几个方法：                            

        //用于检索选中复选框节点方法

        private void cr_tree(TreeNode treeNode)     

        {

            foreach (TreeNode tn in treeNode.Nodes)

            {

                cr_check(tn);             //调用cr_check()方法

                cr_tree(tn);              //调用本身,递归

            }

        }

        private void cr_check(TreeNode treeNode)                   

        {

            if (treeNode.Checked == true)

            {

                if (treeNode.Text == "用户建立与授权")

                {

                    ln_gly = 1;                                  

                }

                if (treeNode.Text == "用户建立与授权" || treeNode.Text == "菜单创建与调整")