Building Along in .NET framework

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Building Along
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This Building Along has two different sets of steps: one to use if you implemented printing and want to add exception handling to the printing code, and one to use if you did not implement printing but still want to try some exception handling If you do want to implement exception handling in your printing, for the Purchase Tracker sample application: Open the MDI parent form (PTMDIParentWin) in the Code Editor Add a Try/Catch block to the PrintPage event handler, as shown in this section Run the application It displays your splash screen and then shows the MDI parent form Without opening any child forms, select Purchase Tracker | Print to see your message
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4
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Building the User Interface Layer
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If you want to try exception handling without implementing printing, for the Purchase Tracker sample application: Open the MDI parent form (PTMDIParentWin) in the Code Editor Add a Try/Catch block to the Click event for the Delete toolbar button as follows:
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Private Sub DeleteToolStripButton_Click(_ ByVal sender As Object, _ ByVal e As SystemEventArgs) _ Handles DeleteToolStripButtonClick Try Dim frmMDIChild As IMDIChild frmMDIChild = TryCast(MeActiveMdiChild, _ IMDIChild) frmMDIChildProcessDelete() Catch ex As InvalidOperationException MessageBoxShow(exMessage) End Try End Sub
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Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form Click the Delete button on the MDI parent form toolbar to see your error message
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Inserting strategically placed Try/Catch blocks within your application can help ensure that your application is robust and does not display unhandled exception errors to your users
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Conclusion
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What Did This Cover
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This chapter described how to build the user interface layer for your application It demonstrated techniques for implementing event handlers, building a base form class, using form instances, creating an MDI application, implementing a standard programmatic interface, and handling exceptions It also provided information on using smart tags, using XML
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Conclusion
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comments and regions, saving user and application settings, drawing graphics, printing, and adding strings to the resource le This chapter covered several real productivity enhancers:
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4 BUILDING THE USER INTERFACE LAYER
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Using smart tags provides a quick way to access the most common properties of controls in the Forms Designer Using the Tab Order view of the Forms Designer can make it a breeze to check or set the tab order for your form Writing generalized event handlers allows you to use the same event handler for multiple controls on a form Building a base form class provides standardized processing for all the forms of your application and signi cantly reduces the amount of code required in each form Using the MDI Parent Form template automatically generates much of the standardized MDI parent code for you Saving user and application settings using the Settings feature of Visual Studio minimizes the amount of code that you need to write to manage these settings Using a resource le provides quick programmatic access to the strings in your application while making it easy to modify those strings Making use of the Using keyword ensures that unmanaged resources are correctly disposed without the need to write any extra code
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The next chapter provides information on building your application s business logic layer, including how to create high-quality methods and build a base business object class
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Building Along
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If you are building along with the Purchase Tracker application, this chapter added a base form class that you can inherit from as you create every other form in the application It also added an MDI parent form to the application and implemented some of its functionality, such as form printing, print preview, and print setup Exception throwing and handling were also put into place to enhance the application s robustness You can run the Purchase Tracker application and view the Product form You can also use the Save, New, and Delete buttons, but they only display a message at this point
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