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if (File.Exists(txtBrow.Text) != false)   // Îı¾¿òtxtBrowÖÐÄÚÈÝΪÎļþ·¾¶¼°ÎļþÃû
{
     //»ñÈ¡Îļþºó׺
     FileInfo p = new FileInfo(txtBrow.Text.Trim());
     F_str_Type = p.Extension.ToLower();
     if (F_str_Type.Length > 5)
     {
         MessageBox.Show("²»¿Éʶ±ðµÄÎļþ¸ñʽ£¬ÇëÖØÐÂÈ·ÈÏ£¡","¾¯¸æ");
         return;
     }
     //ÅжÏÎļþ´óС
     if (p.Length == 0)
     {
         MessageBox.Show("ÎļþµÄ´óСΪ“0”£¬²»Äܱ£´æ£¡", "¾¯¸æ");
         return;
     }
      //´´½¨Îļþ¶ÔÏóÒÔ´ò¿ªµÄÐÎʽ¶ÁÈ¡Îļþ
      FileStream sFileStream = new FileStream(txtBrow.Text, FileMode.Open);
      //·ÖÅäÊý×é´óС
      byte[] bFile = new byte[sFileStream.Length];
      //½«ÎļþÄÚÈݶÁ½øÊý×é
      sFileStream.Read(bFile, 0, (int)sFileStream.Length);
      //¹Ø±ÕÎļþ¶ÔÏó
       sFileStream.Close();
       //²éÕÒÎĵµÀà±ðºÅ
       OleDbDataReader topicread = SaveConn.GetReader("select File_ID from FileTopic where File_Topic='" + cbbTopic.Text.Trim() + "'");
         //Read()·½·¨ÓÃÀ´¶ÁÈ¡OleDbDataReader¶ÔÏóÖеļǼ
         topicread.Read();
         T_int_Topic=(int)topicread["File_ID"];
         OleDbConnectio


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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using MySql ......

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MSSQL:
declare @begin datetime
declare @End datetime
set @begin=getdate()
   --Ö´ÐеÄÓï¾äдÔÚÕâÀï
set @End=getdate()
select datediff(millisecond,@begin,@End) as Ö´ÐеÄʱ¼ä
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