Building the User Interface Layer in VS .NET

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This approach is also good Some would say it is better than the preceding option, because the check is in the method itself Implementing the second option is easy In the print option event handler, add code similar to this:
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If MeActiveMdiChild Is Nothing Then MessageBoxShow("Please open a form to print before " _ & "selecting this option") Else PTPrintDocumentPrint() End If
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Implementing the third option is similar In the PrintPage event (or the method called by the PrintPage event), add the code to check for an active MDI child form Immediately following this line:
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Dim frmToPrint As Form = MeActiveMdiChild
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If frmToPrint Is Nothing Then eCancel = True MessageBoxShow("Please open a form to print before " _ & "selecting this option") Else End If
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Because the PrintPage event was already generated, the runtime continues to attempt to print So if there is no active MDI child form to print, the rst thing the code needs to do is cancel the PrintPage event It then displays an appropriate message to the user The Else clause contains all the other code for the PrintPage event processing shown in the prior section You can also combine the second and third options to perform the check in both the Print menu options and in the PrintPage event By performing the check rst in the Print menu options, you prevent the Print dialog from displaying when there is no active MDI child form By performing the check also in the PrintPage event, you ensure that the
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event code handles the problem in case the Print menu options don t This defensive coding technique protects your code from changes to other code in the application
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4 BUILDING THE USER INTERFACE LAYER
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Message text is another one of those things that seem to change frequently Maybe you have a boss that likes to interject ideas for improving the messages Maybe you have a marketing department that wants the wording just so Maybe you have helpful testers or usability experts that want to provide feedback Or maybe you have to support localization Whatever the situation, you can make your life much easier if you separate message text from your code Visual Basic provides resource les to aid you in managing your text strings external from your code Visual Basic 2005 makes the task of de ning and referencing text strings even easier with its improved Resource File editor and strongly typed resource le entries To add a text string to a resource le: 1 Open the Project Designer for the Windows Application project Right-click the project in Solution Explorer and select Properties from the context menu, or select Project | Properties from the main menu bar, or double-click on the My Project folder under the project to open the Project Designer 2 Select the Resources tab 3 In the Name column of the grid, type the name of the string Use good naming conventions so that you can more easily manage your strings This is important because you may have many strings Since you can sort the strings by name, you may want to de ne a naming convention so that all strings begin with the name of the entity or feature (or an abbreviation thereof), such as Product or Print For example, for the print error message in the prior section, the resource string name is PrintErrActiveForm 4 In the Value column of the grid, type the actual text For example, for the print error message in the prior section the resource string value is Please open a form to print before selecting this option 5 Enter any comments in the Comment column
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You can then use the text string anywhere in the project by referencing its name as follows:
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