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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.

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

of the analysis and development of the detailing model, however, can be used to further refine the BIM, and thus can be beneficial for the whole project It may be useful to make a model of a specific area that requires greater development or further analysis to resolve some specific issues In this case, rather than modeling the entire project to that level of detail, only the area in question needs to be modeled to Figure 228 Ductwork and cable tray fabrication model being coordinated with architectural model (Image courtesy of RQ Construction)

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

their careers Write about censorship, ratings systems, and violence in the media If you have access to some web space (and most big Internet service providers now offer a little web space free along with their other account services), create a fan web site about some of your favorite games, or a review web site Although the computer game industry is nowhere near as big as, say, the film industry, there s still plenty to say about it If your work is really good, see if your local newspaper has anybody who routinely reviews video games If they don t, they might be interested in publishing what you ve written It can t hurt to ask Although none of this is going to immediately get you a job in the industry, doing it shows that you re serious Look at it this way: suppose you re a hiring manager, and you ve got two nearly identical r sum s from entry-level people One person has been playing, thinking, and writing about games in his spare time, while the other has been hanging out at the mall Which one are you going to ask in for an interview

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];

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.

if ((bm != null) && (bm.Position < bm.Count - 1)) { bm.Position ++; } EnablePhotoButtons(bm); } private void btnPrev_Click (object sender, System.EventArgs e) { BindingManagerBase bm = BindingContext[_album]; if ((bm != null) && (bm.Position > 0)) bm.Position --; EnablePhotoButtons(bm); }

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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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// 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