c# - How to Create Simple but powerful Trial check -


i'm making own type of trial mode , wondering if there way check if time information text file same date.today?

private void trial() {     datetime savenow = datetime.today;     datetime expirydate = datetime.today.adddays(30);     string filename = system.io.path.combine(         environment.getfolderpath(environment.specialfolder.userprofile), "trailexample.txt");      if (!file.exists(filename))     {         // write string file.         system.io.streamwriter file = new system.io.streamwriter(filename);         file.writeline(savenow);         file.writeline(expiredate);         file.close();     }     else if (file.exists(filename))     {         var lastline = file.readlines(filename).last();          if (savenow == lastline) // doesn't work of course kinda idea. need with.         {             messagebox.show("your trial over");         }     } }

why not this? don't need text file can modify. have program create hidden file somewhere. doesn't have have in it. checking creation date on hidden file. 

           else if (file.exists(filename));               {             datetime creationdate  = file.getcreationtime(file);             datecomparisonresult comparedate = creationdate.compareto(savenow);              if ((int) comparedate < 0)               {                   messagebox.show("your trial over");                 }        }

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