asp.net mvc - Cell formating in csv -

i exporting generated serial code in 3 formats (with c# asp.net mvc): .txt, .csv , .xls. thing in .txt , .xls code in right format. in .csv loses leading 0 if starts 0 , example:

183531982165

is shown like

1,83532e+11

this code snipped use fill file:

public static byte[] createfile(sericalcodemodel scobj, mydb db)     {         using (system.io.filestream fs = new system.io.file.create(filepath))         {             using (system.io.textwriter wr = new system.io.streamwriter(fs))             {                 list<list<string>> filelines = db.get<serialcode>().getserialcodeoutdatatofile(scobj); // db records                 foreach (list<string> fileline in filelines)                 {                     wr.writeline(string.join(";", fileline));                 }             }         }     } 

this error occurs when open file excel, otherwise, other editor notepad shown how is!

why , how can fix error?