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Flushes any cached data. If the parameter value is true, any intermediate buffers (such as those maintained by the operating system) will also be flushed so that the data is written to disk. Locks a region of the file so that other processes cannot read or write to that part of the file. The first parameter defines the start of the region to lock. The second parameter defines the length of the region. Unlocks a previously locked region of the file.

Lock(long, long)

Unlock(long, long)

c. Treating all customers alike d. Email e. Direct mail In the case given in this chapter, it was suggested that the increased retention was due to a. Customer communications b. Advanced software c. CRM d. More loyal customers e. Cookies on the Web What is considered to be a good average response rate for email communications a. 30 percent b. 20 percent c. 2 percent d. 1 percent e. 0.4 percent What is the most important factor in database marketing success a. Software b. A data warehouse c. The Web d. Marketing strategy e. CRM In risk/revenue analysis, the marketer concentrates most on a. Those customers in priority A and priority B b. The lifetime value of priority B customers c. The churn model d. The lifetime value model e. The data warehouse What s wrong with treating all customers alike a. It s undemocratic. b. The resources available to devote to the best customers will be too small. c. Even worthless customers deserve a break. d. It is impossible to segment customers by behavior. e. Customers would not like it.

Listing 20-18 provides a demonstration of using the FileStream class. Listing 20-18. Using the FileStream Class using System; using System.IO; class Listing 18 { static void Main(string[] args) { // create a file stream to an existing file FileStream myStream = new FileStream("tempfile.txt", FileMode.Create, FileAccess.ReadWrite); // write some data to the file for (int i = 0; i < 5; i++) { Console.WriteLine("Writing value: {0}", i); myStream.WriteByte((byte)i);

Yet another new piece of the Java Collections Framework is the new NavigableMap and NavigableSet interfaces. They extend the SortedMap and SortedSet interfaces, respectively, to essentially add search options to the interfaces.

} // flush the data, including any intermediate buffers myStream.Flush(true); // close the file myStream.Close(); // create a new Stream to the same file FileStream myOtherStream = new FileStream("tempfile.txt", FileMode.Open, FileAccess.Read); // read the data from the stream for (int value; (value = myOtherStream.ReadByte()) > -1; ) { Console.WriteLine("Read Value: {0}", value); } // close the file myOtherStream.Close(); // delete the file File.Delete("tempfile.txt"); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 20-18 opens a FileStream that creates a new file and writes a series of byte values to it. The data is flushed to the disk, and the FileStream is closed. A second FileStream opens the file in a readonly mode and reads the data back in again. The file is deleted so that the example can be run repeatedly. Compiling and running Listing 20-18 produces the following results: Writing value: Writing value: Writing value: Writing value: Writing value: Read Value: 0 Read Value: 1 Read Value: 2 Read Value: 3 Read Value: 4 Press enter to 0 1 2 3 4

Some streams are backed by other streams; these are called pass-through streams. When you write data to a pass-through stream, it is processed in some way and then passed to the backing stream, which in turn passes it to the actual data store. When you read data from a pass-through stream, data is obtained from the backing stream, which gets it from the actual data store, processed in some way and then returned to you. This is illustrated by Figure 20-6.

Figure 20-6. Using a pass-through stream A pass-through stream can be used to perform any kind of operation on a backing stream. The most commonly used pass-through streams in the .NET Framework Library are used to compress data before writing it to the stream and to buffer data.

Customer segments Gold Control Silver Control Bronze Control Lead Control Total Number promoted 100,000 20,000 100,000 20,000 100,000 20,000 100,000 20,000 480,000 Sales rate 8.10% 7.94% 6.60% 6.41% 5.01% 4.60% 2.34% 2.40% Lift 0.16% 0.19% 0.41% 0.06% Lift in sales 160 190 410 (60) 700

The BufferedStream class allows you to add a layer of buffering to your stream. The buffer is used to reduce the number of read and write operations that are passed through to the backing stream; this is typically done to improve performance. You create BufferedStream objects by using the following constructor: