Gets or sets a value indicating whether the SqlDataSource control has data caching enabled.
Assembly: System.Web (in System.Web.dll)
The SqlDataSource control supports data caching. While data is cached, the Select method retrieves data from the cache rather than from the underlying database. When the cache expires, the Select method retrieves data from the underlying database, and then caches the data again.
The SqlDataSource control automatically caches data when the property is set to true and the CacheDuration property is set to a value greater than 0, which indicates the number of seconds that the cache stores data before retrieving a fresh set.
When you are using client impersonation under Microsoft Windows authentication, the data is cached when the first user accesses the data. If another user requests the same data, the data is retrieved from the cache. The data is not retrieved by making another call to the database to verify the user's access to the data. If you expect more than one user to access the data, and you want each retrieval to the data to be verified by the security configurations for the database, do not use caching.
The following code example demonstrates how to retrieve data from the Northwind database in Microsoft SQL Server and display it in a GridView control, with data caching enabled. The property is set to true and the CacheDuration is set to 20 seconds. Because the CacheExpirationPolicy property is set to the Absolute field by default, users of this page will see fresh data every 20 seconds.
<%@ Page language="VB" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>ASP.NET Example</title> </head> <body> <form id="form1" runat="server"> <asp:SqlDataSource id="SqlDataSource1" runat="server" DataSourceMode="DataSet" ConnectionString="<%$ ConnectionStrings:MyNorthwind%>" EnableCaching="True" CacheDuration="20" SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"> </asp:SqlDataSource> <asp:GridView id="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1"> <columns> <asp:BoundField HeaderText="First Name" DataField="FirstName" /> <asp:BoundField HeaderText="Last Name" DataField="LastName" /> <asp:BoundField HeaderText="Title" DataField="Title" /> </columns> </asp:GridView> </form> </body> </html>
Available since 2.0