such as Peng Network. NET three-tier architecture chapter II Login and Membership management

Explain the login function and member management function in the dining item

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Three-tier project: Relational data C # class data table name Class name field encapsulated into attribute three layer each function separate login window point login-"Call the BLL Method-" Call DAL Method-"Database Database-" dal-"bll-" ui- --------------------------------------------------------------------------------------------Singleton mode:

//private static readonly memberform Mf =new memberform ();        public static Memberform Getmemberform ()//{//return Mf;        } private static  memberform _instance; public static  Memberform Instance {get  {if (_instance = = NULL | |  _instance.                isdisposed) {_instance = new  memberform (); } return  _instance;}} Private  Memberform () {InitializeComponent ();}        

  Show only once, Singleton mode        private static membereditform _instance;  Show only once, Singleton mode        private static membereditform _instance;        <summary>//  /ture to modify false for new//        </summary>        private static bool _isedit;  Ture Modify false new//<summary>/////</summary>//        <param name= "Isedit" > Whether to modify </param>//        <param name= "Member" > Modified objects </param>///        <returns></ returns> public        static Membereditform single (bool isedit, Member Member)        {            if (_instance = = NULL || _instance. isdisposed)            {                _instance = new membereditform (member);            }            _isedit = isedit; return _instance;}      

Random number

               1. Generate random number                r=new random ();                int num = R.next (+ +);                String strdate = DateTime.Now.ToString ("Yyyymmddhhmmss");                Txtnum.text = strdate + num;  

Load list:

            MEMBERTYPEBLL BLL = new membertypebll ();            list<membertype> list = BLL. Getmembertypes (false);            List. Insert (0,new membertype () {Name = "Please select", Id =-1});            Cmbtype.datasource = list;            Cmbtype.displaymember = "Name"; Displayed value            cmbtype.valuemember = "Id";//Saved value   

Pop-up or close the window after the prompt window is finished

        Msgmd.msgdivshow ("Login succeeded. ", 1, Bind);                   .....        private void Bind ()        {            dialogresult=DialogResult.OK;            This. Cclose ();        }              

relational data is converted to object data, and special values are processed (null,<=0, etc.)

Write generic SQL statements as much as possible (do not have special functions in the statement, because the functions of each version function differently)

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such as Peng Network. NET three-tier architecture chapter II Login and Membership management