📄 listing1205.aspx
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<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<script runat="server">
sub Page_Load(obj as Object, e as EventArgs)
if not Page.IsPostBack then
CreateData()
end if
end sub
sub CreateData
dim source as DataView
source = Cache("DataSet")
if source is nothing then
dim strConnString as string = "Provider=" & _
"Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=C:\ASPNET\data\banking.mdb"
dim objCmd as OleDbDataAdapter = new _
OleDbDataAdapter("select * from tblUsers", _
strConnString)
dim ds as DataSet = new DataSet()
objCmd.Fill(ds, "tblUsers")
source = new DataView(ds.Tables("tblUsers"))
Cache.Add("DataSet", source, nothing, DateTime.Now. _
AddMinutes(1), TimeSpan.Zero, _
CacheItemPriority.High, CacheItemPriorityDecay.Slow, _
nothing)
'Cache("DataSet") = source
lblMessage.Text = "Data set created explicitly"
else
lblMessage.Text = "Data set retrieved from cache"
end if
dgData.DataSource = source
dgData.DataBind()
end sub
sub ExpireCache(obj as object, e as eventargs)
dim dv as dataview = Cache.Remove("DataSet")
CreateData()
end sub
</script>
<html><body>
<form runat="server">
<asp:Label id="lblMessage" runat="server"
maintainState=false/><p>
<asp:Button id="btSubmit" runat="server"
text="Expire Cache"
OnClick="ExpireCache"/><p>
<asp:DataGrid id="dgData" runat="server"
BorderColor="black"
GridLines="Vertical"
cellpadding="4"
cellspacing="0"
width="450"
Font-Name="Arial"
Font-Size="8pt"
HeaderStyle-BackColor="#cccc99"
ItemStyle-BackColor="#ffffff"
AlternatingItemStyle-Backcolor="#cccccc" />
</form>
</body></html>
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