. NET creating and writing a CSV file

  /// <summary>        ///Create and write a log/// </summary>        /// <param name= "SuccessA100" ></param>        /// <param name= "Result" ></param>         Public voidWritelog (list<string> SuccessA100,stringResult,stringA102) {            if(SuccessA100 = =NULL)            {                return; }            stringTxtpath = AppDomain.CurrentDomain.BaseDirectory +"log\\"+a102 +"\\"+ Result +a102. Replace ("-","") +datetime.now.tostring ("YYYYYMMDD")  +". csv"; if(!file.exists (Txtpath)) {                if(! Directory.Exists (AppDomain.CurrentDomain.BaseDirectory +"log\\"+A102)) {Directory.CreateDirectory (AppDomain.CurrentDomain.BaseDirectory+"log\\"+A102); } FileStream FS1=NewFileStream (Txtpath, FileMode.Create, FileAccess.Write);//Create write File                using(StreamWriter SW =NewStreamWriter (FS1)) {SW. WriteLine ("A001,"); foreach(stringA100inchSuccessA100) {SW. WriteLine (A100+",");//Start Write Value} SW.                    Close (); FS1.                Close (); }            }            Else{FileStream fs=NewFileStream (Txtpath, Filemode.append, FileAccess.Write); using(StreamWriter SW =NewStreamWriter (FS)) {                    foreach(stringA100inchSuccessA100) {SW. WriteLine (A100+",");//Start Write Value} SW.                    Close (); Fs.                Close (); }} thread.sleep ( +); }

. NET creating and writing a CSV file