StreamWriter (DataSet) export Excel

 public void writeexcel (Dataset ds, string path)          {            try             {                 SaveFileDialog saveFileDialog = new  SaveFileDialog ();                 saveFileDialog.Filter =  "execl files  (*.xls) |*.xls";                  savefiledialog.filterindex =  0;                 savefiledialog.restoredirectory = true;                 savefiledialog.createprompt = false;                 saveFileDialog.Title =  "Export Excel file to";                 saveFileDialog.FileName = path;                  if  (Savefiledialog.showdialog ()  == dialogresult.ok)                  {                      Stream myStream;                     mystream  = savefiledialog.openfile ();                 &nbsP;    streamwriter sw = new streamwriter (myStream,  Encoding.GetEncoding ("gb2312"));                     stringbuilder sb = new stringbuilder ();                      for  (Int k = 0; k < ds. Tables[0]. columns.count; k++)                      {             &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SB. Append (ds. Tables[0]. COLUMNS[K]. Columnname.tostring ()  +  "\ T");                     }   &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SB. Append (Environment.NewLine);                      for  (Int i = 0; i < ds. Tables[0]. rows.count; i++)                      {                         for  (int j = 0;  j < ds. Tables[0]. columns.count; j++)                          {                         &NBSP;&NBSP;&NBSP;&NBSP;SB. Append (ds. Tables[0]. ROWS[I][J]. ToString ()  +  "\ T");                         }        &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SB. Append (Environment.NewLine);//Line wrapping after each line of data                      }          &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SW. Write (sb.) ToString ());                 &NBSP;&NBSP;&NBSP;&NBSP;SW. Flush ();                  &NBSP;&NBSP;&NBSP;SW. Close ();//Release Resources         &Nbsp;           killspecialexcel ();                      MessageBox.Show ("The specified Excel file has been generated!");                 }             }             catch  (Exception ex)              {                 messagebox.show (ex. Message);            }         }

StreamWriter (DataSet) export Excel