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Another option for loading on demand is the use of the ShowMoreResultsBox and EnableVirtualScrolling properties. These properties allow you to poll results in batches, so if the user s filter results in too many records, the data will be returned piecemeal. To use these properties, you need to handle the ItemsRequested server-side event and calculate the next set of items to load. The RadComboBoxItemsRequestedEventArgs object passed to the event handler has two important properties, NumberOfItems and Message; these indicate the number of items already loaded to the control and the message displayed in the ShowMoreResults box, respectively. The following example shows how to enable this functionality. Items added in the ItemsRequested event handler are cleared when the next ItemsRequested event fires. However, if you use the ShowMoreResultsBox or EnableVirtualScrolling properties, the items will not be cleared upon clicking the ShowMoreResultsBox arrow or scrolling down. The EnableLoadOnDemand property allows the user to enter text in the input area, regardless of the value of the AllowCustomText property, because the load on demand mechanism requires the user to be able to enter text. Listing 6-9 implements this load-on-demand mechanism, and Figure 6-6 illustrates the main differences in the behavior of RadComboBox. Listing 6-9. Loading on Demand Using the ShowMoreResultsBox and EnableVirtualScrolling Properties ASPX Page <telerik:RadComboBox ID="RadComboBox7" Runat="server" EnableLoadOnDemand="True" MaxHeight="300px" OnItemsRequested="RadComboBox7_ItemsRequested" DropDownWidth="250px" ShowMoreResultsBox="true" EnableVirtualScrolling="true" > </telerik:RadComboBox> Code Behind protected void RadComboBox7_ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e) { var combo = (RadComboBox)o; var sql = "SELECT * from Products WHERE ProductName LIKE '" + e.Text + "%'"; var data = new DataTable(); using (SqlConnection cnn = new SqlConnection(ConfigurationManager .ConnectionStrings["NorthwindConnectionString"] .ConnectionString)) { using (SqlDataAdapter adapter = new SqlDataAdapter(sql, cnn)) { try { cnn.Open(); adapter.Fill(data); }

By defining the base URL and folder name in a BIDS report project, you can deploy the RDL files that are created directly to the report server while in design mode. The base URL is of the form http://Servername/ReportServer. We ll cover the entire BIDS design environment in 3, including most available report objects. We ll also describe the RDL schema that defines every aspect of an SSRS report. Figure 1-3 shows the BIDS design environment, also called an integrated development environment (IDE), with a report loaded in design mode.

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catch (Exception ex) { // write error handling logic here } } } try { const int itemsPerRequest = 20; int itemOffset = e.NumberOfItems; int endOffset = itemOffset + itemsPerRequest; if (endOffset > data.Rows.Count) { endOffset = data.Rows.Count; } for (int i = itemOffset; i < endOffset; i++) { string productName = data.Rows[i]["ProductName"].ToString(); RadComboBoxItem comboItem = new RadComboBoxItem(productName); combo.Items.Add(comboItem); } e.Message = data.Rows.Count > 0 String.Format("Items <b>1</b>-<b>{0}</b> out of <b>{1}</b>", endOffset, data.Rows.Count) : "No matches"; } catch { e.Message = "No matches"; } }

With Visual Studio 2005/2008, you are also given the option to use the Report Viewer control in an ASP.NET application. This can give you the flexibility to develop custom reporting applications that do not have to be distributed to users or updated on an end user s machine each time a patch is deployed. Users can access your custom application through any standard Web browser, and any modifications can be transparent to your end users. You will use many of the same concepts and methods in this project that were used in the forms version of the application. Start by creating a new ASP.NET Web Application project. Name this project SSRS_WebViewer and choose a location for your source files.

RadComboBox also includes the feature of automatic load-on-demand (or codeless load-on-demand). This feature enables you to add load on demand to RadComboBox by just configuring the property EnableAutomaticLoadOnDemand instead of EnableLoadOnDemand, and it will configure the server-side loadon-demand functionality for you. You can also use the ItemsPerRequest property to specify how many items to load on each request. Listing 6-10 illustrates how to configure automatic load-on-demand functionality with a declarative datasource. Listing 6-10. Automatically Loading on Demand ASPX Page <telerik:RadComboBox ID="RadComboBox9" Runat="server" MaxHeight="300px" DropDownWidth="250px" DataSourceID="SqlDataSource3" DataTextField="ProductName" DataValueField="ProductID" EnableAutomaticLoadOnDemand="true" ItemsPerRequest="10" ShowMoreResultsBox="true" EnableVirtualScrolling="true" > </telerik:RadComboBox> <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" SelectCommand="SELECT [ProductID], [ProductName] FROM [Products]"> </asp:SqlDataSource> This example works very well, but how about the scenario when you define the datasource using code Well, it works exactly the same, but you need to define the DataSource property of RadComboBox on every request to ensure it knows where to load the data every time. The example in Listing 6-11 creates a list of products (or FakeProducts to differentiate from the Products table in the database). Then, on every request it configures the DataSource property of RadComboBox. Listing 6-11. Automatically Loading on Demand with DataSource Configured in the Code Behind ASPX Page <telerik:RadComboBox ID="RadComboBox9" Runat="server" MaxHeight="300px" DropDownWidth="250px" DataTextField="ProductName" DataValueField="ProductID" EnableAutomaticLoadOnDemand="true" ItemsPerRequest="10" ShowMoreResultsBox="true" EnableVirtualScrolling="true" > </telerik:RadComboBox>

Figure 3-10. Evaluate Policies dialog box ready to apply changes After you click the Apply button, the changes are applied immediately, and the policies are reevaluated. The results are updated and shown on the Evaluation Results page of the Evaluate Policies dialog box.

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