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' Create an array that will hold the name of each customer. Dim names() As String ReDim names(dt.Rows.Count - 1) ' Fill the array. Dim i As Integer = 0 For Each row As DataRow in dt.Rows names(i) = row("au_fname") & " " & row("au_lname") i += 1 Next Return names End Function Private Function GetAuthorDataSet() As DataSet Dim cache As System.Web.Caching.Cache cache = HttpContext.Current.Cache ' Check for cached item. Dim ds As DataSet If cache("DataSet") Is Nothing Then ' Re-create the item. ds = New DataSet("DataSet") Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("SELECT * FROM Authors", con) Dim adapter As New SqlDataAdapter(cmd) Try con.Open() adapter.Fill(ds, "Authors") Finally con.Close() End Try ' Store the item in the cache (for 60 seconds). cache.Insert("DataSet", ds, Nothing, _ DateTime.Now.AddSeconds(60), TimeSpan.Zero) Else ' Retrieve it from the cache. ds = CType(cache("DataSet"), DataSet) End If

The GetAuthorDataSet() method includes all the caching logic. If the DataSet is in the cache, it returns it immediately. Otherwise, it queries the database, creates the DataSet, and inserts it in the cache. The end result is that both web methods can use the same cached data.

a.UserInfoLink:hover { padding-left: 5px; color: #dc143c; } .Button { color: Black; font-family: Verdana, Helvetica, font-size: 12px; } .AdminTitle { color: Black; font-family: Verdana, Helvetica, text-decoration: none; font-size: 21px; font-weight: bold; line-height: 25px; } .AdminPageText { color: Navy; font-family: Verdana, Helvetica, text-decoration: none; font-size: 12px; } a.AdminPageText { color: Navy; font-family: Verdana, Helvetica, text-decoration: none; font-size: 12px; } a.AdminPageText:hover { color:Red; }

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As well as the SelectedIndexChanged event, Web list controls have another very helpful event. Introduced in ASP.NET 2.0, the DataBound event is fired immediately after the Web control has been data-bound whether this is automatic or caused by an explicit call to DataBind() for the Web control or its parent.

The SqlDataSource ( 15), ObjectDataSource ( 24), and XmlDataSource ( 17) all support built-in data caching. Using caching with these controls is highly recommended, because unlike your own custom data code, the data source controls always requery the data source in every postback. They also query the data source once for every bound control, so if you have three controls bound to the same data source, three separate queries are executed against the database just before the page is rendered. Even a little caching can reduce this overhead dramatically.

Note Although many data source controls support caching, it s not a required data source control feature,

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In this example, you ll modify the previous DataReader example to use the SelectedIndexChanged and DataBound events, rather than relying on the fact that the page has been posted back to assume that the user has made a selection. 1. Open List_DataReader.aspx and save it as List_Binding_Events.aspx. 2. Change the <title> of the page to List Binding with Events to a DataReader. 3. In the Source view, change the Page_Load event handler to the following: protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { // create SqlConnection object string ConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(ConnectionString); // create SqlCommand object SqlCommand myCommand = new SqlCommand(); myCommand.Connection = myConnection; try { // open the database connection myConnection.Open(); // set up SQL query for Manufacturer table myCommand.CommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer"; // run query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the list lstManufacturers.DataSource = myReader; lstManufacturers.DataBind();

and you ll run into data source controls that don t support it or for which it may not make sense (such as the SiteMapDataSource).

To support caching, the SqlDataSource, ObjectDataSource, and XmlDataSource controls all use the same properties, which are listed in Table 26-4.

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If True, switches caching on. It s False by default. Uses a value from the DataSourceCacheExpiry enumeration Absolute for absolute expiration (which times out after a fixed interval of time), or Sliding for sliding expiration (which resets the time window every time the data object is retrieved from the cache). Determines the number of seconds to cache the data object. If you are using sliding expiration, the time limit is reset every time the object is retrieved from the cache. The default value, 0, keeps cached items perpetually. Allows you to make a cached item dependent on another item in the data cache (CacheKeyDependency) or on a table in your database (SqlCacheDependency). Dependencies are discussed in the Cache Dependencies section.

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