asp.net string to heavy __.net

String strplanreceiver = String.
            Empty; String strplanreceiverole = String.
            Empty;
            Taskmodel model = new Taskmodel ();
            Systemmanager Syman = new Systemmanager ();  Model = Syman.gettaskreceiverinfobyid (TaskID);
                According to TaskID get the task recipient configuration information if (model!= null) {#region construct the receiver, receiver role string, and go to heavy Constructs the receiver, recipient role string, which is used to send messages strplanreceiver + = model.
                Planreceiver + ","; Strplanreceiver + = model.
                PlanReceiver0 + ","; Strplanreceiver + = model.
                PlanReceiver1 + ","; Strplanreceiver + = model.
                PlanReceiver2 + ","; Strplanreceiver + = model.
                PlanReceiver3 + ",";

                Strplanreceiver = Strplanreceiver.trim (', '); Strplanreceiverole + = model.
                Planreceiverole + ","; Strplanreceiverole + = model.
                PlanReceiveRole0 + ","; Strplanreceiverole + = model.
                PlanReceiveRole1 + ","; StrpLanreceiverole + = model.
                PlanReceiveRole2 + ","; Strplanreceiverole + = model.
                PlanReceiveRole3 + ",";

                Strplanreceiverole = Strplanreceiverole.trim (', ');    The string goes heavy Strplanreceiver = Stringunique (strplanreceiver);    Receiver string to go heavy Strplanreceiverole = Stringunique (strplanreceiverole); Receive role string to #endregion}

#region string to///<summary>///string///</summary>///<param name= "Strli
        St "></param>///<returns></returns> private String Stringunique (String strlist) {//1. Converts strings to array string result = String.
            Empty;

            string[] Str_num = Strlist.split (', ');
            2. Define ArrayList to determine that the repeating field in the array is not added to the ArrayList object ArrayList al = new ArrayList (); for (int i = 0; i < Str_num. Length; i++) {//To determine whether an if (AL) already exists. Contains (str_num[i]) = = False) {al.
                ADD (Str_num[i]); }//3. Converts ArrayList to an array of str_num = new String[al.
            Count]; Str_num = (string[]) al.

            ToArray (typeof (String)); 3. Array to string, and a comma interval result = string.

            Join (",", str_num);
        return result;; } #endregion