定义几个私有变量：

        private operation oper = new operation();

        private string lc_yhmm;  //用户密码

        private string lc_cdbms;  //菜单项与分隔符组成的字符串

        private string lc_yhxms;  //用户姓名

        private string lc_jsbms;   //角色编码

        private string lc_jsmcs;   //角色名称

        private string lc_dwmcs;  //单位名称

    单击按钮事件中有关用户登陆代码：

        private void button1_Click(object sender, EventArgs e)

        {

            string lc_srmm = textBox2.Text;

            string lc_scmm = oper.mmjmsc(lc_srmm);  //调用密码加密输出方法

            if (lc_yhmm == lc_scmm)

            {

                FormZct.lc_cdbms = lc_cdbms;       //为主窗体全局变量赋值

                FormZct.lc_yhbms = textBox1.Text;

                FormZct.lc_yhxms = lc_yhxms;

                FormZct.lc_jsmcs = lc_jsmcs;

                FormZct.lc_dwmcs = lc_dwmcs;

                FormZct.lc_yhmms = lc_yhmm;

            }

            else

            {

                MessageBox.Show("用户密码输入错误 !", "系统提示",

 MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

                FormZct.lc_cdbms = string.Empty;

                FormZct.lc_yhbms = string.Empty;

                textBox2.Text = string.Empty;

                textBox2.Focus();

                return;

            }