隨機取得Access資料庫記錄

由於Access資料庫記錄集快取的原因，從程式碼得到Access資料庫隨機記錄是無法使用，需要用隨機SQL語句的方法來消除快取。

以下是範例：

看範例http://dotnet.aspx.cc/Exam/GetRandom.aspx

<%@ Page Language="C#" Debug="true" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.OleDb" %>
<title>隨機得到Access資料庫記錄</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 序號,Title As 標題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" Horizo​​ntalAlign="Center"
Width="600px" runat="server" Font-Size="9pt">
<AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle>
<HeaderStyle BackColor="#AAAADD" Font-Bold="True" Horizo​​​​ntalAlign="Center" />
</asp:DataGrid>
</form>