Mega Code Archive
Using the Cache object with the SqlDependency object (VB)
<![CDATA[
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data"%>
<%@ Import Namespace="System.Data.SqlClient"%>
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Dim myCustomers As DataSet
myCustomers = CType(Cache("firmCustomers"), DataSet)
If myCustomers Is Nothing Then
Dim conn As SqlConnection = New SqlConnection( ConfigurationManager.ConnectionStrings("AppConnectionString1").ConnectionString)
Dim da As SqlDataAdapter = New SqlDataAdapter("Select * From Customers", conn)
myCustomers = New DataSet
da.Fill(myCustomers)
Dim myDependency As SqlCacheDependency = New SqlCacheDependency("Northwind", "Customers")
Cache.Insert("firmCustomers", myCustomers, myDependency)
Label1.Text = "Produced from database."
Else
Label1.Text = "Produced from Cache object."
End If
GridView1.DataSource = myCustomers
GridView1.DataBind()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Sql Cache Invalidation</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Label ID="Label1" Runat="server"></asp:Label><br />
<br />
<asp:GridView ID="GridView1" Runat="server"></asp:GridView>
</form>
</body>
</html>
File: Web.config
<?xml version="1.0"?>
<configuration>
<appSettings/>
<connectionStrings>
<add name="AppConnectionString1" connectionString="Data Source=.\SQLEXPRESS;User ID=wrox;Password=wrox1*c;Database=Northwind;Persist Security Info=False" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<caching>
<sqlCacheDependency enabled="true">
<databases>
<add name="Northwind" connectionStringName="AppConnectionString1" pollTime="500"/>
</databases>
</sqlCacheDependency>
</caching>
<compilation debug="true" strict="false" explicit="true"/>
<pages>
<namespaces>
<clear/>
<add namespace="System"/>
<add namespace="System.Collections"/>
<add namespace="System.Collections.Specialized"/>
<add namespace="System.Configuration"/>
<add namespace="System.Text"/>
<add namespace="System.Text.RegularExpressions"/>
<add namespace="System.Web"/>
<add namespace="System.Web.Caching"/>
<add namespace="System.Web.SessionState"/>
<add namespace="System.Web.Security"/>
<add namespace="System.Web.Profile"/>
<add namespace="System.Web.UI"/>
<add namespace="System.Web.UI.WebControls"/>
<add namespace="System.Web.UI.WebControls.WebParts"/>
<add namespace="System.Web.UI.HtmlControls"/>
</namespaces>
</pages>
<authentication mode="Windows"/>
</system.web>
</configuration>
]]>