ASP.NET Web PDF Document Viewer/Editor Control Library

The code template for the code behind the globalasax has stubs of traps for a few events in the request pipeline Also present are Application_Start and Application_End, as well as Session_Start and Session_End These are holdovers from classic ASP The application start event is fired when the first instance of HttpApplication is created within an application domain Requests are processed within an IIS application from a pool of HttpApplication objects Session start and end are fired as sessions are created and torn down You can do your own user-specific allocation and disposal of resources in traps of these events The events of the HttpApplication pipeline can be trapped by using a method naming convention: Public void Application_OnEventName(Object sender, EventArgs e) The ASP NET runtime gives globalasax special treatment.

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For example: let rec even n = (n = 0u) || odd(n-1u) and odd n = (n <> 0u) && even(n-1u) This gives the following types: val even : uint32 -> bool val odd : uint32 -> bool Of course, a more efficient, nonrecursive implementation of these is available! let even (n:uint32) = (n % 2u) = 0u let odd (n:uint32) = (n % 2u) = 1u.

BFILE columns, where the row stores a locator to the external operating system file that holds the value of the BFILE. Each BFILE instance in a given row has its own distinct locator; however, two different rows can contain a BFILE locator that points to the same operating system file.

Figure 15-4. Adding a one-to-many relationship between Employees and Addresses In the previous example, you had made the AddressID field nullable, meaning that it is possible that not every employee will have an address. You can also control what happens if employees or addresses are removed or updated. (However, as a design decision you need to carefully consider one-to-many relationships such as those shown earlier: should the change in the address of one employee cause the same change in the addresses of all other employees with the same address Probably, if indeed it is the same address; otherwise, a particular employee should be updated with a different address record.) Placing a cascade on deletes will remove all records that are linked to a record that is deleted; naturally you should treat this option with care.

Even though there s no code creating the delegate and passing it to this event definition, code is generated behind the scenes that sinks the event This is a very VB-like strategy, telling the developer to pay no attention to the code generator behind the curtain You also cannot override the default constructor and provide your own code to sink these events, as the code generation that occurs at runtime also generates a default constructor for the same class, resulting in a compile error when you provide your own default constructor There s also no way to reference any public field defined at the class level with the inline script model Adding a public static field to this class definition is the recommended alternative to using the Application object Accessing a static field is much quicker than doing a lookup from the Application state bag.

Internal LOBs (CLOBs, NCLOBs, and BLOBs)

In the following sections, we show how to perform relational database queries using F# LinqToSql. F# LinqToSql uses F# quotation meta-programming to represent SQL queries. These are then translated across to SQL and executed using the Microsoft LINQ libraries that are part of the .NET Framework 3.5. At the time of writing, you can work with F# LinqToSql as part of the Beta 2 release of this framework, but check the latest samples in the F# distribution for full details and updates. In the following sections, we will assume we are working with the Northwnd.mdf database, a common database used in many LINQ samples. You can find instructions on downloading this sample database at http://www.expert-fsharp.com/Topics/Linq.