ASP.NET PDF Viewer using C#, VB/NET

The procedure do_rel_delete deletes all rows in components_rel and implicitly in parts_rel: 169 170 171 172 173 procedure do_rel_delete as begin delete components_rel; end do_rel_delete; The procedure do_nt_delete deletes all rows in components_nt and implicitly in parts_nt: 175 176 177 178 179 procedure do_nt_delete as begin delete components_nt; end do_nt_delete;

Note Forcibly aborting computations uncooperatively is not recommended in .NET programming. You can attempt to do this using System.Threading.Thread.Abort(), but the use of this method may have many unintended consequences, discussed later in this chapter.

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The procedure do_rel_bulk_insert inserts a given number of parent records and a given number of children for each parent record into the tables components_rel and parts_rel using PL/SQL bulk binding technique. When using bulk binding, you first store all rows to be inserted in a collection, and then insert it in one shot using the special forall syntax, thus avoiding the overhead of switching contexts between the SQL engine and the PL/SQL engine. Bulk binding is discussed in detail in the section Using Bulk Binding of 17.

Enables you to declaratively bind to an Access database file (MDB). Enables you to bind to an object model. Specialized XML format that describes the structure and hierarchy of your site. Used for binding to the site navigation controls. Allows for binding to relational data sources. Used to bind to an XML document.

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The two background worker samples we ve shown so far run at full throttle. In other words, the computations run on the background threads as active loops, and their reactive behavior is limited to flags that check for cancellation. In reality, background threads often have to do different kinds of work, either by responding to completing asynchronous I/O requests, by processing messages, by sleeping, or by waiting to acquire shared resources. Fortunately, F# comes with a powerful set of techniques for structuring asynchronous programs in a natural way. These are called asynchronous workflows. In the next three sections, we cover how to use asynchronous workflows to structure asynchronous and message-processing tasks in ways that preserve the essential logical structure of your code.

None of these controls has visible rendering behaviors of its own. They can more logically be thought of as components rather than controls, but in order to avoid having to write code (as is common with components), they re implemented as controls. When you re using a data source control, the creation of the interface is done by one of the new Web Controls that inherits from the DataBoundControl base class (or HierarchicalDataBoundControl) listed in Table 11-2. Table 11-2. DataBoundControls in ASP .NET 2.0

procedure do_rel_bulk_insert( p_num_of_parents in int := 50, p_num_of_children in int := 500 ) as l_tmp_comp number; type array is table of parts_rel%rowtype index by binary_integer; l_childdata array; l_part_rel_id number := 1; begin for i in 1..p_num_of_parents loop insert into components_rel values ( i, 'component'||i ); for j in 1..p_num_of_children loop l_childdata(j).component_id := i; l_childdata(j).part_id := l_part_rel_id; l_childdata(j).part_name := 'part'||i||j; l_childdata(j).part_desc := 'part desc' || i||j; l_part_rel_id := l_part_rel_id + 1; end loop; forall X in 1 .. p_num_of_children insert into parts_rel values l_childdata(X); end loop; commit; end do_rel_bulk_insert; end ; /

One of the most intuitive asynchronous tasks is fetching a web page; we all use web browsers that can fetch multiple pages simultaneously. In the samples in 2 we showed how to