随机得到Access数据库记录

　　由于Access数据库记录集缓存的原因，从代码里得到Access数据库随机记录是得不到，需要用随机SQL语句的办法来消除缓存。
  
  下面就是例子：
  
  查看例子http://dotnet.aspx.cc/Exam/GetRandom.aspx
  
  <%@ Page Language="C#" Debug="true" %>
  <%@ import Namespace="System.Data" %>
  <%@ import Namespace="System.Data.OleDb" %>
  <title>随机得到Access数据库记录</title>
  <script runat="server">
  void Page_Load(Object src,EventArgs e)
  {
  if(!IsPostBack)
   {
   string MyConnString = "Provider=Microsoft.Jet.OleDB.4.0;Data Source="
   + Server.MapPath("aspxWeb.mdb.ascx");
   Random R = new Random();
   int intRandomNumber = R.Next(1,1000);
  
   string sql = "select top 10 id As 序号,Title As 标题 from Document Order By Rnd("
   + (-1 * intRandomNumber).ToString() + "*id)";
   OleDbConnection MyConnection = new OleDbConnection(MyConnString);
   MyConnection.Open();
   OleDbCommand cmd = new OleDbCommand(sql,MyConnection);
   OleDbDataReader dr = cmd.ExecuteReader();
  
   DataGrid1.DataSource = dr;
   DataGrid1.DataBind();
   cmd.Dispose();
   MyConnection.Close();
   MyConnection.Dispose();
   MyConnection = null;
   }
  }
  
  </script>
  <form runat=server>
  <asp:DataGrid id="DataGrid1" HorizontalAlign="Center"
   Width="600px" runat="server" Font-Size="9pt">
   <AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle>
   <HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center" />
  </asp:DataGrid>
  </form>

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