作者：佚名 来源：月光软件站 加入时间：2005-3-1　月光软件站

     br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
     int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;

     for (int i = 0; i < maxCount; i++)
     {
      if (_Response.IsClientConnected)
      {
       _Response.BinaryWrite(br.ReadBytes(pack));
       Thread.Sleep(sleep);
      }
      else
      {
       i=maxCount;
      }
     }
    }
    catch
    {
     return false;
    }
    finally
    {
     br.Close();
     myFile.Close();
    }
   }
   catch
   {
    return false;
   }
   return true;
  }

调用例

   Page.Response.Clear();
      
   bool success = ResponseFile(Page.Request, Page.Response, "filename", @"C:\download.date", 1024000);
   
   if(!success)
    Response.Write("下载文件出错！");

   Page.Response.End();