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Note that data source controls are like ordinary server controls and can be programmatically configured and invoked. In the code just shown, you first check the selection the user made and, if it matches the first option (All Countries), configure the data source control to make a parameterless call to the LoadAll method.

You must clean up the content of the SelectParameters collection upon page loading. The data source control (more precisely, the underlying view control) caches most of its properties to the view state. As a result, SelectParameters is not empty when you refresh the page after changing the drop-down list selection. The preceding code clears only the SelectParameters collection; performancewise, it could be preferable to disable the view state altogether on the data source control. However, if you disable the view state, all collections will be empty on the data source control upon loading. Important ObjectDataSource allows data to be retrieved and updated while keeping data

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2. In the Cube Designer, click the Dimension Usage tab . The Dimension Usage tab shows the cube dimensions on rows and measure groups on columns . The rows in this grid show the name of the database dimension followed by the name of the cube dimension enclosed in parentheses .

access and business logic separate from the user interface. The use of the ObjectDataSource class doesn t automatically transform your system into a well-designed, effective n-tiered system. Data source controls are mostly a counterpart to data-bound controls so that the latter can work more intelligently. To take full advantage of ObjectDataSource, you need to have your DAL already in place. It doesn t work the other way around. ObjectDataSource doesn t necessarily have to be bound to the root of the DAL, which could be on a remote location and perhaps behind a firewall. In this case, you write a local intermediate object and connect it to ObjectDataSource on one end and to the DAL on the other end. The intermediate object acts as an application-specific proxy and works according to the application s specific rules. ObjectDataSource doesn t break n-tiered systems, nor does it transform existing systems into truly n-tier systems. It greatly benefits, instead, from existing business and data layers.

Tip If you save the Excel report directly to disk at this point, you must use Excel XP or later to open the file. By using the Open button, you can use the Save As Workbook feature to share the file with users who have an earlier version of Excel.

The ObjectDataSource component supports caching only when the specified select method returns a DataSet or DataTable object. If the wrapped object returns a custom collection (as in the example we re considering), an exception is thrown. Custom object caching is something you must do on your own. ObjectDataSource is designed to work with classes in the business layer of the application. An instance of the business class is created for each operation performed and is destroyed shortly after the operation is completed. This model is the natural offspring of the stateless programming model that ASP.NET promotes. In the case of business objects that are particularly expensive to initialize, you can resort to static classes or static methods in instance classes. (If you do so, bear in mind what I said earlier regarding unit testing classes with static methods.) Instances of the business object are not automatically cached or pooled. Both options, though, can be manually implemented by properly handling the ObjectCreating and ObjectDisposing events on an ObjectDataSource control. The ObjectCreating event fires when

the data source control needs to get an instance of the business class. You can write the handler to retrieve an existing instance of the class and return that to the data source control:

The intersection of a dimension and measure group contains the information about how the dimension and measure group are related . 3. Select the cell in the grid at the intersection of the Date (Order Date) dimension and the Fact Reseller Sales measure group . An ellipsis button appears in the cell .

// Handle the ObjectCreating event on the data source control public void BusinessObjectBeingCreated(object sender, ObjectDataSourceEventArgs e) { BusinessObject bo = RetrieveBusinessObjectFromPool(); if (bo == null) bo = new BusinessObject(); e.ObjectInstance = bo; }

Likewise, in ObjectDisposing you store the instance again and cancel the disposing operation being executed:

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