/ Read temporary file
   GYYW.DA.Common.Base_SqlDataBase daBZDM = new GYYW.DA.Common.Base_SqlDataBase();
   DataSet dsBZDM = daBZDM.GetDataSetBySql("select QCDM,MC,GG from WG_BZDM where QCDM like '02%'");

   // At the same time will virtual directory under Data As a temporary file directory.
   string urlPath = HttpContext.Current.Request.ApplicationPath + "/Data/";
   string physicPath = HttpContext.Current.Server.MapPath(urlPath);
   //string fileName = Guid.NewGuid() + ".Xls";
   string fileName ="DownLoad.Xls";
   string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + physicPath + fileName +";Extended Properties=Excel 8.0;";
 
   OleDbConnection objConn = new OleDbConnection(connString);
   OleDbCommand objCmd = new OleDbCommand();
   objCmd.Connection = objConn;
   objCmd.Connection.Open();
  
   // Building a table structure
   objCmd.CommandText = @"CREATE TABLE Sheet1( Equipment code  varchar, The name of the  varchar,  specifications  varchar)";
   objCmd.ExecuteNonQuery();
   // Create the insertion action Command
 
   objCmd.CommandText = "INSERT INTO Sheet1( Equipment code ,  The name of the , specifications ) VALUES (@QCDM, @MC, @GG)";  
   objCmd.Parameters.Clear();
  
   objCmd.Parameters.Add(new OleDbParameter("@QCDM", OleDbType.VarChar));
   objCmd.Parameters.Add(new OleDbParameter("@MC", OleDbType.VarChar));
   objCmd.Parameters.Add(new OleDbParameter("@GG",OleDbType.VarChar));
   
   // traverse DataSet Insert the data into the newly created Excel In the file
   foreach (DataRow row in dsBZDM.Tables[0].Rows)
   {  
    for (int i=0; i<objCmd.Parameters.Count; i++)
    {
     objCmd.Parameters[i].Value = row[i];
    }
    objCmd.ExecuteNonQuery();
   }
   objCmd.Connection.Close();
  
   // Available to download
   // Clear temporary files
   HttpResponse response = HttpContext.Current.Response;
   response.Clear();
   // Prepare for output
   response.WriteFile(urlPath + fileName);
   string httpHeader="attachment;filename=KCMX.Xls";
   response.AppendHeader("Content-Disposition", httpHeader);
   response.Flush();
   // Clear temporary files after output
   string strSaveDir = "../Data/";
   string strFile = Server.MapPath(strSaveDir + fileName).ToString();
   //string sss = urlPath + fileName;
   System.IO.File.Delete(strFile);// Delete temporary file
   response.End();