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This change allows the user to move forward and backward within the selected album. The controls automatically update whenever the Position property is altered. If you compile and run the current code, you will find that the controls still do not update properly when the selected album changes. For this we will need some additional code. If you look back at .NET Table 17.7 on the BindingManagerBase class, you will see that there is no method to update, or refresh, the controls bound to the associated data source. This is because some binding managers, notably the PropertyManager, have no need for this functionality. The refresh behavior is only required when a data source contains multiple instances. In this case, the binding manager is a CurrencyManager class instance. A summary of this class appears in .NET Table 17.8.

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Searches for adjacent matching elements within a sequence and returns an iterator to the first match Performs a binary search on an ordered sequence Copies a sequence Same as copy except that it moves the elements from the end of the sequence first Returns the number of elements in the sequence Returns the number of elements in the sequence that satisfy some predicate Determines if two ranges are the same Returns a range in which an element can be inserted into a sequence without disrupting the ordering of the sequence Fills a range with the specified value Searches a range for a value and returns an iterator to the first occurrence of the element Searches a range for a subsequence It returns an iterator to the end of the subsequence within the range Finds the first element within a sequence that matches an element within a range Searches a range for an element for which a user-defined unary predicate returns true Applies a function to a range of elements Assign elements in a range the values returned by a generator function Determines if one sequence includes all of the elements in another sequence Merges a range with another range Both ranges must be sorted in increasing order The resulting sequence is sorted Exchanges the values pointed to by its two iterator arguments Alphabetically compares one sequence with another Finds the first point in the sequence that is not less than a specified value Constructs a heap from a sequence Returns the maximum of two values Returns an iterator to the maximum element within a range Merges two ordered sequences, placing the result into a third sequence

// Wrong way #1 to support error handling int err = 0; Bitmap bm = Bitmap.CreateObject(dlg.OpenFile(), err); if (err != 0) { // An error occurred if (err == bad_file_error) { // Indicate to the user that the file could not be loaded. } else if (err == memory_error) { // Indicate that memory is running low. } return; } // Assign the newly created Bitmap to our PictureBox pbxPhoto.Image = bm; // on error abort the event handler

Table 27-5

27:

This code would certainly work, but it requires extra variables and the programmer must check for errors every time a bitmap is created. This might be problematic if the programmer forgets or a new error is added which is not handled by the code. Then our design is for naught and bad things will happen. In critical production code, the mishandling of errors can lead to serious problems such as corrupted database information, unexpected stock trades, or other actions that a user or a program would not normally allow to happen. So this solution does not provide the best guarantees for program and data stability. A second way to handle errors is to provide a global GetLastError function. This solution was used by Microsoft prior to the MFC environment, and is still used in some cases within MFC. It looks something like this: