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Upper- and lowercase rules vary considerably among cultures, and you should be cautious when using ToUpper and ToLower for this purpose. For culture-insensitive scenarios, there are also methods called ToUpper Invariant and ToLowerInvariant whose results are not affected by the current culture. MSDN provides a considerable amount of resources devoted to culture-sensitive string operations. A good starting point can be found here: http://msdn.microsoft.com/en-us/library/5bz7d2f8

The result of the preceding section was nice and neat; but what if our array of strings had come from a user Users have a tendency to whack the Return key a few times before they write anything at all, and add spurious spaces and tabs to the beginning and end of lines, particularly when copying and pasting between applications. They might also add commas or periods or something like that, again in the interest of tidiness. They might spell things incorrectly. There s no accounting for what users might do. Let s simulate that with a new function shown in Example 10-62.

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private static string[] SoliloquizeLikeAUser() { return new string[] { "", null, " ", String.Empty, " To be, or not to be--that is the question: ", "Whether 'tis nobelr in the mind to suffer,", "\tThe slings and arrows of outrageous fortune ,", "", "\tOr to take arms against a sea of troubles, ", "And by opposing end them.", "", "", "", "", ""}; }

The site simply logs the credentials, and either reports an error to the user or redirects the user to the legitimate site (or both) The attacker later uses the logged credentials to log into the user s account and transfer money from the user s account to their own Why do users fall for clicking such links in e-mails sent by phishers Phishers use various techniques to hide the fact that the link is to their illegitimate, spoofed site Following is an example First, in HTML documents, a link is constructed as follows: <A HREF='http://wwwdestination-sitecom/'> Click here </A> When the e-mail is rendered by a browser, the link will look like this: Click here, and the destination address will not be apparent to an unsuspecting user An attacker can use code such as the following in an HTML e-mail sent to the victim: <A HREF=http://wwwevil-sitecom/> http://www.

Notice their extensive use of the Return key, the tendency to put the odd comma at the end of the line, and the occasional whack of the Tab key at the beginning of lines. Sadly, if we use this function and then print the output using String.Concat like we did in Example 10-57, we end up with output like this:

To be, or not to be--that is the question: Whether 'tis nobelr in the mind to suffer, The slings and arrows of outrageous fortune , Or to take arms against a sea of troubles, And by opposing end them.

We can write some code to tidy this up. We can build up our output string, concatenating the various strings, and cleaning it up as we go. This is going to involve iterating through our array of strings, inspecting them, perhaps transforming them, and then appending them to our resultant string. Example 10-63 shows how we could structure this, although it does not yet include any of the actual cleanup code.

string[] strings = SoliloquizeLikeAUser(); string output = String.Empty; // This is equivalent to "" foreach (string line in strings) { // Do something to look at the line... // then... output = output + line + Environment.NewLine; } Console.WriteLine(output);

legitimate-sitecom/ </A> The browser displays http://wwwlegitimate-sitecom/, but when the user clicks the link, the browser loads the front page of wwwevil-sitecom since that is what is specified by the hyperlink reference (HREF) in the anchor (A) tag in the HTML e-mail In real phishing attacks, the phisher might have the browser display wwwpaypalcom or wwwgooglecom, and have the hyperlink reference point to wwwpaypa1com (with a 1 instead of a l ) or wwwgogolecom ( google misspelled), respectively Slightly more sophisticated users may position their mouse over the link prior to clicking it Many browsers will display the address of the destination site at the bottom of the browser window or in a pop-up tool tip Such users may decide not to click the link if the actual destination site does not match their expectation..

This would work just fine; but look at what happens every time we go round the loop. We create a new string and store a reference to it in output, throwing away whatever was in output before. That s potentially very wasteful of resources, if we do this a lot. Fortunately, the .NET Framework provides us with another type we can use for precisely these circumstances: StringBuilder.

Click the Run button. VWD will automatically come to the foreground once the breakpoint is hit. This time, code on the line of the breakpoint is highlighted in yellow (see Figure 9-19): all of the code above the highlight in the getSearchResults operation has been executed; all of the code below it has yet to be executed.

Earlier we saw that the Array class offers a variety of helper methods for finding elements in arrays. If you try to use these directly on a List<T>, it won t work. The following code from Example 7-14 will not compile if events is a List<CalendarEvents>, for example:

DateTime dateOfInterest = new DateTime (2009, 7, 12); CalendarEvent[] itemsOnDateOfInterest = Array.FindAll(events, e => e.StartTime.Date == dateOfInterest);

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