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The BindingManagerBase class represents a data source bound to one or more controls within a Windows Forms control. This class enables synchronization of all controls with a property bound to the associated data source. This class is part of the System.Windows.Forms namespace. This class is abstract and cannot be instantiated. The CurrencyManager class is used for all data sources that support the IList interface, while the PropertyManager class is used for all single-value data sources. Also note that most of the members listed here are abstract as well, and must be overridden by a derived class. Bindings Count Public Properties Current Position AddNew CancelCurrentEdit EndCurrentEdit Public Methods GetItemProperties RemoveAt ResumeBinding SuspendBinding CurrentChanged Public Events PositionChanged Occurs when the the Position property changes. Gets the collection of bindings managed by this object. Gets the number of rows managed by this object. Gets the current, or active, list item in the associated data source. Gets or sets the position, or index, of the item to consider active in the associated data source. Adds a new item of the appropriate type to the associated data source. Cancels the current edit, if any, of the associated data source. Completes the current edit, if any, of the associated data source. Retrieves the collection of PropertyDescriptor objects from the associated data source. Deletes the item at the specified index from the associated data source. Resumes data binding for the data source. Suspends data binding for the data source. Occurs when the the Current property changes.

Notice that Show( ) is declared in one part of XY and implemented by another part The implementation displays the values of X and Y This means that when Show( ) is called by ShowXY( ), the call has effect, and it will, indeed, display X and Y However, if you comment-out the implementation of Show( ), then the call to Show( ) within ShowXY( ) does nothing Partial methods have several restrictions, including these: They must return void They cannot have access modifiers They cannot be virtual They cannot use out parameters

We can make immediate use of the Position property to implement the Next and Prev buttons for our application.

It is possible to make one assembly the friend of another A friend has access to the private members of the assembly of which it is a friend This feature makes it possible to share members between selected assemblies without making those members public To declare a friend assembly, you must specify the friend assembly s name and its public key token in an InternalsVisibleTo attribute

To conclude Part I, the few remaining keywords defined by C# that have not been described elsewhere are briefly discussed

HANDLE THE CLICK EVENTS FOR THE NEXT AND PREV BUTTONS Action 1 Create a new EnablePhotoButtons method to enable or disable the Next and Prev buttons as required based on a given BindingManagerBase object. Add a Click event handler for the Next button in the Photo tab page control of the MainForm window. Retrieve the BindingManagerBase object associated with the _album data source. If the object was retrieved and the

The lock keyword is used when creating multithreaded programs It is examined in detail in 23, where multithreaded programming is discussed A brief description is given here for the sake of completeness

private void EnablePhotoButtons (BindingManagerBase bm) { btnNext.Enabled = (bm.Position < _album.Count - 1); btnPrev.Enabled = (bm.Position > 0); } private void btnNext_Click (object sender, System.EventArgs e) { BindingManagerBase bm = BindingContext[_album];

Part I:

In C#, a program can contain more than one thread of execution When this is the case, the program is said to be multithreaded, and pieces of the program are executed concurrently Thus, pieces of the program execute independently and simultaneously This raises the prospect of a special type of problem: What if two threads try to use a resource that can be used by only one thread at a time To solve this problem, you can create a critical code section that will be executed by one and only one thread at a time This is accomplished by lock Its general form is shown here: lock(obj) { // critical section } Here, obj is the object on which the lock is synchronized If one thread has already entered the critical section, then a second thread will wait until the first thread exits the critical section When the first thread leaves the critical section, the lock is released and the second thread can be granted the lock, at which point the second thread can execute the critical section

value, increment the current position. 5 6 Call the EnablePhotoButtons method at the end of this handler. Handle the Click event for the Prev button in a similar fashion.

You can create a read-only field in a class by declaring it as readonly A readonly field can be given a value only by using an initializer when it is declared or by assigning it a value within a constructor Once the value has been set, it can t be changed outside the constructor Thus, a readonly field is a good way to create a fixed value that has its value set by a constructor For example, you might use a readonly field to represent an array dimension that is used frequently throughout a program Both static and non-static readonly fields are allowed