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The DataView allows for some surprisingly complex filter expressions. One of its little-known features is the ability to filter rows based on relationships. For example, you could display categories that contain more than 20 products, or you could display customers who have made a certain number of total purchases. In both of these examples, you need to filter one table based on the information in a related table. To create this sort of filter string, you need to combine two ingredients: A table relationship that links two tables. An aggregate function such as AVG(), MAX(), MIN(), or COUNT(). This function acts on the data in the related records. For example, suppose you ve filled a DataSet with the Categories and Products tables and defined this relationship: // Define the relationship between Categories and Products. DataRelation relat = new DataRelation("CatProds", ds.Tables["Categories"].Columns["CategoryID"], ds.Tables["Products"].Columns["CategoryID"]); // Add the relationship to the DataSet. ds.Relations.Add(relat); You can now filter the display of the Categories table using a filter expression based on the Products table. For example, imagine you want to show only category records that have at least one product worth more than $50. To accomplish this, you use the COUNT() function, along with the name of the table relationships (CatProds). Here s the filter string you need: MAX(Child(CatProds).UnitPrice) > 50 And here s the code that applies this filter string to the DataView: DataView view1 = new DataView(ds.Tables["Categories"]); view1.RowFilter = "MAX(Child(CatProds).UnitPrice) > 50"; GridView1.DataSource = view1; The end result is that the GridView shows only the categories that have a product worth more than $50.

Asynchronous calls work a little differently in ASP.NET 2.0. The proxy class no longer has built-in BeginXxx() and EndXxx() methods. However, you can use an alternate approach for event-based notification of asynchronous operations that is built into the proxy class and makes sense for long-running clients such as Windows applications.

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function receives an active database cursor; all arguments and return values of each of these functions are documented in the following list, as well as another mapping for picking the right field types based on the underlying column types database Given the name of a specific table, found using , this returns a list of tuples, each describing a column in the table Each tuple follows PEP-249 s standard for the cursor s attribute: The here is an internal type used by the database to identify the column type, which will be used by the reverse mapping described at the end of this section Given a table s name, this returns a dictionary detailing the relationships the table has with other tables.

You can use asynchronous threads in .NET in several ways. All delegates provide BeginInvoke() and EndInvoke() methods that allow you to trigger them on one of the threads in the CLR thread pool. This technique, which is convenient and scales well, is the one you ll consider in this section. Alternatively, you could use the System.Threading.Thread class to explicitly create a new thread, with complete control over its priority and lifetime. As you already know, delegates are typesafe function pointers that form the basis for .NET events. You create a delegate that references a specific method, and then you can call that method through the delegate. The first step is to define the delegate at the namespace level (if it s not already present in the .NET class library). For example, here s a delegate that can point to any method that accepts a single integer parameter and returns an integer: public delegate int DoSomethingDelegate(int input); Now consider a class that has a method that matches this delegate: public class MyClass { public int DoubleNumber(int input) { return input * 2; } }

You can create a delegate variable that points to a method with the same signature Here s the code: MyOClass myObj = new MyClass(); // Create a delegate that points to the myObjDoubleNumber() method DoSomethingDelegate doSomething = new DoSomethingDelegate(myObjDoubleNumber); // Call the myObjDoubleNumber() method through the delegate int doubleValue = doSomething(12); What you may not realize is that delegates also have built-in threading smarts Every time you define a delegate (such as DoSomethingDelegate in the previous example), a custom delegate class is generated and added to your assembly (A custom delegate class is needed because the code for each delegate is different, depending on the signature of the method you ve defined) When you call a method through the delegate, you are actually relying on the Invoke() method of the delegate class The Invoke() method executes the linked method synchronously.

However, the delegate class also includes methods for asynchronous invocation BeginInvoke() and EndInvoke() When you use BeginInvoke(), the call returns immediately, but it doesn t provide the return value Instead, the method is simply queued to start on another thread When calling BeginInvoke(), you supply all the parameters of the original method, plus two additional parameters for an optional callback and state object If you don t need these details (described later in this section), simply pass a null reference IAsyncResult async = doSomethingBeginInvoke(12, null, null); BeginInvoke() doesn t provide the return value of the underlying method Instead, it returns an IAsyncResult object, which you can examine to determine when the asynchronous operation is complete To pick up the results later, you submit the IAsyncResult object to the matching EndInvoke() method of the delegate.

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