c# – 如何在csv中的值中用逗号导出字符串？

using (StreamWriter myFile = new StreamWriter(filename,false,Encoding.Default))
{
        string sHeaders = "";
        for (int j = 0; j < dGV.Columns.Count; j++)
        {
             if (dGV.Columns[j].Visible)
             {
                 sHeaders = sHeaders.ToString() + dGV.Columns[j].HeaderText + ","; 
             }
        }
        myFile.WriteLine(sHeaders);
        // Export data.  
        for (int i = 0; i < dGV.RowCount; i++)
        {
             string stLine = "";
             for (int j = 0; j < dGV.Rows[i].Cells.Count; j++)
             {
                 if (dGV.Columns[j].Visible)
                 {
                     stLine = stLine.ToString() + dGV.Rows[i].Cells[j].Value.ToString() + ",";
                 }
             }
                        myFile.WriteLine(stLine);
        }
     }
  }

但问题是如果datagridviewcell中的值是Harikrishna,Daxini然后它将无法正确导出,因为单元格值中有逗号,但我需要在值中包含逗号.它应该正确导出.我怎么能去做 ？我尝试用双引号和单引号括起该值,但它不起作用.