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A for loop evaluates the condition before anything else happens. If the condition doesn t evaluate to true, the code statements are not executed, and the for loop finishes. If the condition does evaluate to true, then the code statements are performed. In the example, the condition is i < 3, so the loop checks the condition, and if the variable i has a value less than 3, the code statement is executed. After the code statement has been executed, the for loop evaluates the condition again, and the cycle continues check, execute, check, execute until the condition evaluates to false, at which point the for loop finishes. After each time the code statement is executed, the for loop executes the iterator statement. This is how you can stop the condition check/code statement cycle from repeating forever. In the example, I increment the variable i. Before any of this happens, the initializer is executed once, which gives you an opportunity to define and initialize the variables you are going to use in the condition and iterator. In the example, I define the variable i and assign it a value of zero. The result of this loop is that the code statement will be executed three times, with the variable i having a value of 0, 1, and then 2. These are the index values for a three-item array, so we can use variable value with the array index notation ([]) to access the elements in the array in turn. Compiling the code in Listing 13-8 produces the following output: Item: Item: Item: Press oranges apples guava enter to finish

Native pointers should not refer into the managed heap, because a managed object that a native pointer would refer to could be relocated So far, I have discussed two concepts for referring into the managed heap These are tracking handles (and tracking references) that refer to a managed object s header, as well as interior pointers that refer to a part of the managed object s state The runtime is able to automatically update all tracking handles and interior pointers However, the runtime is not aware of native pointers referring into the managed heap Therefore, it cannot update native pointers Nevertheless, there can be scenarios in which reading or updating the state of a managed object directly from native code is desired.

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Attaches the class specified in className to the image. It must be a valid, defined CSS class available to the host page. Passes focus to the image. If the image is off the page, scrolls the page until it is in view. Unattaches the CSS class specified in className. If the CSS className is currently attached, unattaches it; otherwise, attaches it.

The custom token manager verifies the digital signature on the original request from a client to the security token service provider. Recall that this request must be signed by the client, or it will be rejected by the STS provider. The custom token manager verifies UsernameToken signing tokens. It should be implemented as a separate class in the Web service, although you should provide it with the same namespace as the Web service .asmx file. Listing 8-2 shows the code listing for the custom token manager. Listing 8-2. The Custom Token Manager

For example, instead of copying a managed byte array into a native memory block so that native code can access the copied state, it would be more efficient if native code could directly read the managed array s state For write operations, the situation is similar: instead of modifying a native memory block and copying it byte by byte into a managed array, it would likely be faster to update the managed array directly from native code Reading or modifying the copied state could also require special attention with respect to concurrent updates from other threads NET has a concept that allows native pointers to temporarily refer to a managed object To understand this concept, it is useful to take a step back and review interior pointers.

An interior pointer allows managed code to iterate through a managed array via pointer arithmetic, as this sample from 2 shows: void WeakEncrypt(array<unsigned char>^ bytes, unsigned char key) { cli::interior_ptr<unsigned char> pb = &(bytes[0]); interior_ptr<unsigned char> pbEnd = pb + bytes->Length; while (pb < pbEnd) { *pb ^= key; pb++; } }.

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