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return a parameter of any type. The parameter returned from this function is the return type of the using function. The following example illustrates this by opening a file to append to it: #light open System.IO using (File.AppendText("test.txt")) (fun streamWriter -> streamWriter.WriteLine("A safe way to write to a file")) The call to the BCL s method File.AppendText will return a System.IO.StreamWriter, which is a way of writing to a file. A file is managed by the operating system, so it has an unmanaged aspect. This is why System.IO.StreamWriter implements IDisposable. A System.IO.StreamWriter is passed to the function, which itself makes up the second parameter passed to the using function. This is a neat way of ensuring that the streamWriter is available only inside a limited scope of the function and that it is disposed of straightaway when the function ends. If you did not write your file access using the using function, you would have to explicitly call the Dispose method, or your text would not be flushed from memory into the file. Similarly, there would be a risk that an exception could occur. Although the risk is limited, there is a real risk that a file would not be closed properly and the text not written to it. It s worth noting that using returns unit because the call to StreamWriter.WriteLine returns unit. If you were performing an operation that didn t return unit, say reading from a file or database, you could return a value from the using function. The following example illustrates this by reading from a file and then binding the contents of the first line of that file to the identifier text: #light open System.IO let text = using (File.OpenText("test.txt")) (fun streamReader -> streamReader.ReadLine() )

Microsoft SQL Server is a core component for BizTalk. Many of the data processes will store and retrieve operational data there. You can use SQL Server 2000 with the product, but I recommend using SQL Server 2005 if at all possible.

Livingston: They put you down to other VCs Bhatia: They did. Of course, that was very early on and now everything is all

fine and dandy, but at that point in time . . . we had a term sheet for a much higher valuation. But when we would talk to any other VC, the other VC would call the guys at DFJ and they d say, No, don t invest in them.

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The lock function operates in a fashion similar to using. The purpose of the function is to lock a section of code so that only one thread can pass through it at a time. This issue arises in multithreaded programming because a thread can context switch at any time, leaving operations that should have been atomic half done. This is controlled by locking on an object; the idea is that as soon as the lock is taken, any thread attempting to enter the section of code will be blocked until the lock is released by the thread that holds it. Code protected in this way is sometimes called a critical section. This is achieved by calling System.Threading.Monitor.Enter at the start of the code that is to be protected and System.Threading.Monitor.Exit at the end; it is important to guarantee that Monitor.Exit is called, or this could lead to threads being locked forever. The lock function is a nice way to ensure that Monitor.Exit is always called if Monitor.Enter has been called. It takes two parameters; the first is the object to be locked on,

Livingston: Were they helpful at all Bhatia: Yes. Steve Jurvetson was very helpful; he introduced us to a lot of peo-

ple and, on the whole, they re a good VC firm in the sense that they try to put deals together. But sometimes they don t play by the rules.

Follow these steps to install SQL Server 2005: 1. Insert the SQL Server 2005 disc. 2. Accept the agreement in the End User License Agreement dialog box, and then click Next.

Livingston: Did you ever suggest to Kim that she stop talking to the press van Hoff: Yes, we did, but she ignored it. Kim was a good CEO in the startup

and the second is a function that contains the code to be protected. This function should take unit as its parameter, and it can return any value. The following example demonstrates the subtle issues involved in locking. It needs to be quite long and has been deliberately written to exaggerate the problem of context switching. The idea is that two threads will run at the same time, both trying to write the console. The aim of the sample is to write the string "One ... Two ... Three ... " to the console atomically; that is, one thread should be able to finish writing its message before the next one starts. The example has a function, called makeUnsafeThread, that creates a thread that will not be able to write to the console atomically and a second one, makeSafeThread, that writes to the console atomically by using a lock. #light open System open System.Threading // function to print to the console character by character // this increases the chance of there being a context switch // between threads. let printSlowly (s : string) = s.ToCharArray() |> Array.iter print_char

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