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

Getting response for Prado... Reading response for Prado... Read 188 characters for Prado... Read 41635 characters for MOMA... Getting response for British Museum... Reading response for British Museum... Read 24341 characters for British Museum... The heart of the code in Listing 13-5 is the construct introduced by async { ... }. This is an application of the workflow syntax introduced in 9. Now let s take a closer look at Listing 13-5. The key operations are the two let! operations within the workflow expression: async { do ... let! resp = req.GetResponseAsync() do ... ... let! html = reader.ReadToEndAsync() do ... } Within asynchronous workflow expressions, the language construct let! var = expr in body simply means perform the asynchronous operation expr and bind the result to var when the operation completes. Then continue by executing the rest of the computation body. With this in mind, you can now see what fetchAsync does: It synchronously requests a web page. It asynchronously awaits a response to the request. It gets the response Stream and StreamReader synchronously after the asynchronous request completes. It reads to the end of the stream asynchronously. After the read completes, it prints the total number of characters read synchronously. Finally, the method Async.Spawn is used to initiate the execution of a number of asynchronous computations. This works by queuing the computations in the .NET thread pool. The .NET thread pool is explained in more detail in the following section.

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19,592 (1.00) 221,839 (1.00) 460,808 (1.00) 87,075 (1.00)

These controls have all been created specifically for binding to the data source controls. Each of them exposes a DataSourceID property, which points to a data source control also declared on the page. Using a combination of a DataSourceControl and a DataBoundControl enables you to do data binding declaratively, in place of setting the DataSource and calling DataBind from code. You see this strategy in use here with a GridView and a SqlDataSource. Here s our mantra: design goal = no code. <asp:SqlDataSource Runat=server ID=sdsAuthors ConnectionString="server=.;database=pubs;uid=sa;pwd=123123" SelectCommand="select * from authors" /> <asp:GridView Runat=server ID=dvAuthors DataSourceID=sdsAuthors /> This dumps an HTML table with a border of one to the browser, which is the GridView s default rendering behavior. You can find this code in Simple.aspx of the Web11 project.

Asynchronous computations are different from normal, synchronous computations: an asynchronous computation tends to hop between different underlying .NET threads. To see this, let s augment the asynchronous computation with diagnostics that show the ID of the underlying .NET thread at each point of active execution. You can do this by replacing uses of printfn in the function fetchAsync with uses of the following function: let tprintfn fmt = printf "[.NET Thread %d]" System.Threading.Thread.CurrentThread.ManagedThreadId; printfn fmt After doing this, the output changes to the following:

317,433 (16.20) 224,739 (1.01) 475,312 (1.03) 6,469,635 (74.30)

6,267,036 (319.00) 620,001 (2.80) 1,700,907 (3.69) 95,190 (1.10)

12]Creating request for MOMA... 13]Creating request for British Museum... 12]Creating request for Prado... 8]Getting response for MOMA... 8]Reading response for MOMA... 9]Getting response for Prado... 9]Reading response for Prado... 9]Read 188 characters for Prado... 8]Read 41635 characters for MOMA... 8]Getting response for British Museum... 8]Reading response for British Museum... 8]Read 24341 characters for British Museum...

Note This book does not provide blow-by-blow coverage of each new control provided in ASP.NET 2.0,