CreateForm(

       /// <summary>  
        /// 打开新的子窗体  
        /// </summary>  
        /// <param name="strName">窗体的类名</param>  
        /// <param name="AssemblyName">窗体所在类库的名称</param>  
        /// <param name="MdiParentForm">父窗体</param>  
        public static void CreateForm(string strName, string AssemblyName, Form MdiParentForm)  
        {  
            int Index = strName.LastIndexOf(".");  
            string FormName = strName.Substring(23);  
            if (!ShowChildForm(FormName, MdiParentForm))  
            {  
                string path = AssemblyName;//项目的Assembly选项名称  
                string name = strName; //类的名字  
                Form doc = (Form)Assembly.Load(path).CreateInstance(name);  
                doc.WindowState = FormWindowState.Maximized;  
                doc.MdiParent = MdiParentForm;  
                doc.Show();  
            }  
        }  
   
        /// <summary>  
        /// 防止子窗体再度打开  
        /// </summary>  
        /// <param name="p_ChildrenFormText"></param>  
        /// <param name="MdiParentForm"></param>  
        /// <returns></returns>  
        public static bool ShowChildForm(string p_ChildrenFormText, Form MdiParentForm)  
        {  
            int i;  
            //依次检测当前窗体的子窗体  
            for (i = 0; i < MdiParentForm.MdiChildren.Length; i++)  
            {  
                //判断当前子窗体的Text属性值是否与传入的字符串值相同  
                if (MdiParentForm.MdiChildren.Name == p_ChildrenFormText)  
                {  
                    //如果值相同则表示此子窗体为想要调用的子窗体，激活此子窗体并返回true值  
                    MdiParentForm.MdiChildren.Activate();  
                    return true;  
                }  
            }  
            //如果没有相同的值则表示要调用的子窗体还没有被打开，返回false值  
            return false;  
        }