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Here, obj is an expression that must evaluate to an object that implements the SystemIDisposable interface It specifies a variable that will be used inside the using block In the first form, the object is declared outside the using statement In the second form, the object is declared within the using statement When the block concludes, the Dispose( ) method (defined by the SystemIDisposable interface) will be called on obj Dispose( ) is called even if the using block ends because of an exception Thus, a using statement provides a means by which objects are automatically disposed when they are no longer needed Remember, the using statement applies only to objects that implement the SystemIDisposable interface Here is an example of each form of the using statement:

CATCH EXCEPTIONS IN THE BTNLOAD_CLICK METHOD Action 1 Edit the MainForm.cs source file and locate the btnLoad_Click method. Insert a try block around the Bitmap creation code. Result Note: You can search this file by hand, or use the dropdown box in the top portion of the source code window to select this method explicitly. The changes to the existing code are shown in bold.

// Demonstrate using statement using System; using SystemIO; class UsingDemo { static void Main() { try { StreamReader sr = new StreamReader("testtxt"); // Use object inside using statement using(sr) { // } } catch(IOException exc) { // } try { // Create a StreamReader inside the using statement using(StreamReader sr2 = new StreamReader("testtxt")) { // } } catch(IOException exc) { // } } }

if (dlg.ShowDialog() == DialogResult.OK) { try { imgPhoto.Image = new Bitmap(dlg.OpenFile()); } } if (dlg.ShowDialog() == DialogResult.OK) { try { imgPhoto.Image = new Bitmap(dlg.OpenFile()); } catch (Exception ex) { // Handle exception } }

The class StreamReader implements the IDisposable interface (through its base class TextReader) Thus, it can be used in a using statement When the using statement ends, Dispose( ) is automatically called on the stream variable, thus closing the stream As the preceding example illustrates, using is particularly useful when working with files because the file is automatically closed at the end of the using block, even if the block ends because of an exception As a result, closing a file via using often simplifies filehandling code

20:

The CurrencyManager class represents a binding manager that is associated with a data source supporting the IList interface. This class is part of the System.Windows.Forms namespace, and inherits from the BindingManagerBase class. See .NET Table 17 for the .7 members inherited from the base class. Refresh Public Methods ItemChanged Public Events Forces a repopulation of all bound controls for a data source that does not support notification when the underlying data changes. Occurs when an item in the associated data source is altered. This event will only occur if the associated data source supports two-way notification, such as the support provided by the IBindingList interface.

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , a n d M i s c e l l a n e o u s To p i c s

From the table, it appears that the Refresh method is the solution we need. This method updates the bound controls with the underlying data. For classes that support the IBindingList interface, most notably the database-related objects, this method is not generally needed since the ItemChanged event will occur whenever the database object itself is modified. Do not confuse the ItemChanged event with the PositionChanged event, which occurs when a new item, or row, in the associated list is selected; or with the CurrentChanged event, which occurs when the control s bound property is altered. For our purposes, the default behavior that occurs when the Position or Current properties change will suffice. Since we do not support the IBindingList interface, we need to call the Refresh method directly when our PhotoAlbum is altered internally. In our current interface, this occurs each time a new album file is selected in the Album combo box control. The following table continues our prior steps to alter our SelectedIndexChanged event handler to invoke the Refresh method.