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Adding Items with Dependencies

<%@ Page Language="C#" Trace="true" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.SqlClient" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     void Page_Load()     {         DataSet products = (DataSet)Cache["Products"];         if (products == null)         {             Trace.Warn("Retrieving products from file system");             products = new DataSet();             products.ReadXml(MapPath("~/Data.xml"));             CacheDependency fileDepend = new CacheDependency(MapPath("~/Data.xml"));             Cache.Insert("Products", products, fileDepend);         }         grdProducts.DataSource = products;         grdProducts.DataBind();     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">     <title>Show File Dependency</title> </head> <body>     <form id="form1" runat="server">     <div>     <asp:GridView         id="grdProducts"         Runat="server" />     </div>     </form> </body> </html>