定义几个全局静态变量：

        public static Formyhdl yhdl;

        public static string lc_cdbms = string.Empty;    //菜单项索引号字符串

        public static string lc_yhbms = string.Empty;    //用户编码

        public static string lc_yhxms = string.Empty;    //用户姓名

        public static string lc_jsmcs = string.Empty;     //角色名称

        public static string lc_dwmcs = string.Empty;    //单位名称

        public static string lc_yhmms = string.Empty;    //用户密码

        private System.Windows.Forms.MainMenu mainMenu1 = new MainMenu();

        private System.Windows.Forms.MenuItem menuItem1 = new MenuItem(); 

        private int x1 = 0;

    窗体加载事件中，有关调用用户登陆窗体以及如何进入动态菜单系统代码：

        private void FormZct_Load(object sender, EventArgs e)

        {

            this.Location = new System.Drawing.Point(0, 20);

            this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;

            this.TopMost = false;                                               

            this.WindowState = System.Windows.Forms.FormWindowState.Maximized; 

            this.ControlBox = true;          

            this.MaximizeBox = false;        

            this.MinimizeBox = true;         

            yhdl = new Formyhdl();           

            yhdl.ShowDialog();                       //调用登陆子窗体

            if (lc_cdbms == "")

            {