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What exactly does that code do First, it initializes a variable called myString which we will use to hold the reference to our string object (because String is a reference type). We then enumerate the string, yielding every Char in turn, and we output each Char to the console on its own separate line. Char is a value type, so we re actually getting a copy of the character from the string itself. The string object is created using a literal string a sequence of characters enclosed in double quotes:

"I've gone all vertical."

We re already quite familiar with initializing a string with a literal we probably do it without a second thought; but let s have a look at these literals in a little more detail.

Listing 6-1. Generated IFRAME Code for Your Mashup <iframe style='width:100%; height:100%;' src='http://www.popfly.ms/users/EricGr/My %20Photo%20Mashup.small' frameborder='no'></iframe>

The simplest literal string is a set of characters enclosed in double quotes, shown in the first line of Example 10-2.

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The prevention strategies for SQL injection introduced in this chapter focus on validating or escaping data before it is used in an SQL query. In addition to this SQL-specific validation or escaping, you should not ignore validation of data at the time it actually enters your system. Following the best practice of constraining all input variables (e.g., query parameters in an HTTP request) as early as possible in your code may well save you from being vulnerable in case a programmer forgot to escape a particular variable that is used in an SQL query. Also, rejecting unreasonably long inputs may prevent an attacker from exploiting a buffer overflow in the SQL parser that you weren t aware of and have not applied patches for. Applying validation both at the entry points to your code and before a query means that you may have to do the work twice. However, this small inefficiency is usually well worth the additional safety margin.

string myString = "Literal string"; Console.WriteLine(myString);

This produces the output:

You can also initialize a string from a char[], using the appropriate constructor. One way to obtain a char array is by using char literals. A char literal is a single character, wrapped in single quotes. Example 10-3 constructs a string this way.

string myString = new string(new [] { 'H', 'e', 'l', 'l', 'o', ' ', '"', 'w', 'o', 'r', 'l', 'd', '"' }); Console.WriteLine(myString);

If you compile and run this, you ll see the following output:

In an attempt to remedy the situation, you could decide not to store passwords in the clear Instead, you could store an encrypted version of the passwords, and decrypt the passwords in the file whenever you need to check them To do so, you could use a symmetric encryption algorithm, such as AES (Advanced Encryption Standard) (We will discuss symmetric encryption algorithms in 12) You would need to keep track of a key used to encrypt the passwords, and then you would need to determine where to store the key Storing the key in the password file itself would be a bad idea, since then an attacker that gets hold of the password file could also decrypt all of the passwords in the file If the key is stored anywhere on the same system as the password file, in fact, that system still becomes an extremely valuable attack target.

Hello "world"

Notice that we ve got double-quote marks in our output. That was easy to achieve with this char[], because the delimiter for an individual character is the single quote; but how could we include double quotes in the string, without resorting to a literal char array Equally, how could we specify the single-quote character as a literal char

The way to deal with troublesome characters in string and char literals is to escape them with the backslash character. That means that you precede the quote with a \, and it interprets the quote as part of the string, rather than the end of it. Like this:

"Literal \"string\""

Open your favorite HTML editor, which may be Notepad or a full-featured WYSIWIG (What You See Is What You Get) HTML editor like Microsoft s Expression Web (http:// www.microsoft.com/expression/products/overview.aspx key=web). I use Expression Web, so I will show it in this example. Most editors have similar functionality, so you could easily apply these instructions to another editor. Launch Expression Web, and create a new blank web page, which will have the default name Untitled_1; see Figure 6-9. Save the page now, and name it what you like. Select the Code viewing option at the bottom-left corner of the page editing pane to show the HTML behind the blank page. Copy the HTML from the Popfly mashup s Embed It text box, and paste it between the <body> </body> tags in the HTML code.

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