Asp.net把数据写入Excel表格函数

if (excel.Checked)
   {
    ToExcel(dt,"id/t山东/t济南");
   }

public void ToExcel(DataTable dt, string colName)
  {
   
   StringWriter sw=new StringWriter();
   sw.Write(colName);//
   foreach(DataRow dr in dt.Rows)
   {
    sw.WriteLine("");
    for(int i = 0; i<dt.Columns.Count; i++)
    {
     sw.Write(dr[i].ToString().Replace("/n","") + "/t");
    }
   }
   sw.Close();
   Response.AddHeader("Content-Disposition", "attachment; filename=test.xls");
   Response.ContentType = "application/ms-excel";
   Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
   Response.Write(sw);
   Response.End();
  }