WinForm Right-click Import phone number

Private voidImport Phone number Toolstripmenuitem_click (Objectsender, EventArgs e) {            using(OpenFileDialog Openfile =NewOpenFileDialog ()) {Openfile.filter="text Files |*.txt"; Openfile.multiselect=false; if(Openfile.showdialog () = =DialogResult.OK) {Thread threadfile=NewThread (() =ReadFile (openfile.filename)); Threadfile. IsBackground=true; Threadfile.                Start (); }            }        }        Private voidReadFile (stringfilename) {Txtlog. Invoke (NewAction (() ={Txtlog. AppendText ("start reading mobile phone number".            Setlog ());            })); varFile =file.open (filename, filemode.open); intnum =0; intGoods =0; intrepeat =0; using(varstream =NewStreamReader (file)) {                 while(!Stream. Endofstream) {Lock(lock_send) {if(Sendlist. Count > About)                        {                             Break; }} num++; stringLinetemp =Stream. ReadLine ().                    Trim (); if(Istel (linetemp)) {Lock(lock_send) {vardata = Sendlist. Where (m = M.tel = =linetemp).                            FirstOrDefault (); if(Data! =NULL) {Repeat++; Continue; }} Goods++; Sendtel _send=NewSendtel (); _send. Tel=linetemp; _send.sms_status=status. Pending delivery; _send.send_time=NULL; ListViewItem Item=NewListViewItem (_send.                        Tel); Item. SubItems.Add (_send.sms_status.                        ToString ()); Item.                        SubItems.Add (_send.send_time); Item. SubItems.Add (""); Listsend.invoke (NewAction (() ={ListViewItem Backitem=LISTSEND.ITEMS.ADD (item); Dic. ADD (_send.                        Tel, Backitem);                        })); Lock(lock_send) {sendlist.                        ADD (_send); }}}} txtlog. Invoke (NewAction (() =            {                stringLog =string. Format ("Add complete! Valid data is: {0}, filter duplicate data: {1}, total data: {2}", goods. ToString (), repeat. ToString (), Num.                ToString ()); Txtlog. AppendText (log.            Setlog ());        })); }        /// <summary>        ///Verify that the phone number is legal/// </summary>        /// <param name= "Tel" ></param>        /// <returns></returns>         Public Static BOOLIstel (stringTel) {            Try            {                if(string. IsNullOrEmpty (tel) | | Tel. Length! = One)                {                    return false; }                returnSystem.Text.RegularExpressions.Regex.IsMatch (tel,@"^[1]+[3,4,5,6,7,8]+\d{9}"); }            Catch(Exception ex) {return false; }        }

A long time ago wrote the code, read the TXT file, a line of a mobile phone number,

It seems to require TXT text file must be UTF8 format, otherwise read out will be garbled.

WinForm Right-click Import phone number