<%@ Control Language="VB" ClassName="FragCtrlwithAPI" %>
<%@ OutputCache Duration="60" VaryByControl="pickstate" %>
<script runat="server">
Private duration As TimeSpan
Sub Page_Load(ByVal sender As Object, ByVal E As EventArgs)
If (pickstate.SelectedValue = "CA") Then
duration = New TimeSpan(0, 0, 10)
CachePolicy.Duration = duration
End If
End Sub
Sub Page_PreRender(ByVal sender As Object, ByVal e As EventArgs)
Label1.Text = Now.ToString("G")
Label2.Text = Now.Add(CachePolicy.Duration).ToString("G")
End Sub
</script>
<div style="border: dotted 1px blue; padding: 5px; background-color: #eeeeee;">
<asp:DropDownList ID="pickstate" runat="server" AutoPostBack=true>
<asp:ListItem Text="CA" Value="CA" />
<asp:ListItem Text="UT" Value="UT" />
<asp:ListItem Text="MD" Value="MD" />
<asp:ListItem Text="OR" Value="OR" />
<asp:ListItem Text="MI" Value="MI" />
<asp:ListItem Text="TN" Value="TN" />
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:pubsConnectionString %>"
SelectCommand="SELECT [au_id], [au_lname], [au_fname], [phone], [address], [city], [state], [zip], [contract] FROM [authors] where state=@state"
ProviderName="System.Data.SqlClient">
<SelectParameters>
<asp:ControlParameter ControlID="pickstate" DefaultValue="CA" Name="state" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" DataSourceID="sqldatasource1" />
<p>
Control cache starts at <asp:Label ID="Label1" runat="server" Text="Label"/><br />
Control cache expires at <asp:Label ID="Label2" runat="server" Text="Label"/><br />
</p>
</div>
<%@ Page Language="VB" %>
<%@ Register Src="datactrlnew.ascx" TagName="FragCtrl" TagPrefix="acme" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<acme:FragCtrl ID="FragCtrl1" runat="server" />
Current Time:
<%=Now.ToString("G") %>
<asp:Button ID="Button2" runat="server" Text="Refresh" />
</div>
</form>
</body>
</html>
In this code, only the user control is cached, so only the user control will not reflect the changes when you click refresh.
