مشکل وارد کردن اطلاعات gridview در فایل متنی

[tooraj_azizi_1035]

 public void WriteTextFile(DataTable dtData, string FilePath)



        {



            using (StreamWriter sw = new StreamWriter(FilePath, false))



            {



                for (int x = 0; x < dtData.Columns.Count; x++)



                {



                    sw.Write(dtData.Columns[x].ColumnName + ",");



                }



                sw.WriteLine();







                foreach (DataRow row in dtData.Rows)



                {



                    for (int n = 0; n < dtData.Columns.Count; n++)



                    {



                        sw.Write(row[n].ToString() + ",");



                    }



                    sw.WriteLine();



                }



                sw.Close();



            }



        }