c# - Write to Custom Binary File from DataGridView -

first of all, i'm loading large file data grid view (~100mb). file contains dozens of "profiles". user able select profile want view after gets loaded data grid view. want enable user select specific profile , have them save individual file don't have open large file every time. here how file loaded (note it's databound data grid view):

    private void boardlistview_selectionchanged(object sender, eventargs e)     {         if (boardlistview.selectedrows.count > 0)         {             var s = (boardcandidateoffset)boardlistview.selectedrows[0].databounditem;             loadfromfile(s);             plotmodel.resetallaxes();             plotview.invalidateplot(true);         }     } 

and here read file:

    private void loadfromfile(boardcandidateoffset b)     {         profiles.clear();         using (var stream = file.openread(currentfilename))         using (var reader = new binaryreader(stream))         {             stream.seek(b.fileoffset, seekorigin.begin);             (int = 0; < b.count; i++)             {                 profiles.add(custprofilelist.readfrombinaryreader(reader));             }         }     } 

and here attempt write selected profile new file:

    private void saveastoolstripmenuitem_click(object sender, eventargs e)     {         if (boardlistview.rows.count > 0)         {             savefiledialog saveboard = new savefiledialog();             saveboard.defaultext = ".prof";              if (saveboard.showdialog() == dialogresult.ok)             {                 using (stream stream = file.create(saveboard.filename))                 {                     using (var writer = new binarywriter(stream))                     {                         foreach(var p in profiles)                         {                             p.writetobinarywriter(writer);                         }                     }                 }             }         }         else return;     } 

unfortunately though, i'm getting nothing in file create. suggestions?