barcode scanner c# sample code Viewing the Switchboard Items Table in Microsoft Office

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Viewing the Switchboard Items Table
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When you use the Switchboard Manager to create a switchboard, Access creates a new table named Switchboard Items Each record in the table represents an item in one of the
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Customizing the Navigation Pane and Creating Switchboards
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switchboard pages, and each field in the record describes what command the button carries out and the argument it uses Figure 21-9 shows the table created for the Police database switchboards Table 21-2 describes the contents of the Switchboard Items table You can widen the columns in the table, but don t make any other changes in the table design
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NOTE The first row of each switchboard contains 0 in both the ItemNumber and the Command
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fields, indicating that the ItemText is the switchboard caption and is to be displayed in the title bar The main switchboard has a 0 only in the ItemNumber column The Argument field needs a little explanation The first row contains Default in the Argument field, indicating the Bayview City Police switchboard has been specified as the default switchboard to be displayed at startup if the Display Form/Page option is set to Switchboard A number in the Argument field represents the ID number of the switchboard
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FIGURE 21-9 The Switchboard Items table
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Field SwitchboardID ItemNumber
Contents A sequential number assigned to the switchboard page A sequential number assigned to each item on a page, beginning with 1 Together with the SwitchboardID, it forms the primary key that uniquely identifies the item and switchboard page Switchboards have ItemNumber 0 Text entered in the Text box of the Edit Switchboard Item dialog box Number representing the command selected from the Command list in the Edit Switchboard Item dialog box Commands are numbered sequentially in the order that they appear in the drop-down list For a switchboard page itself, the Command value is 0 Number of the switchboard; the name of form, report, macro, or procedure to be used by the command in the Command list in the Edit Switchboard Item dialog box
Fields in the Switchboard Items Table
ItemText Command
Argument
TABLE 21-2
as the goal of the command Go to Switchboard For example, the fourth row shows 2 in the Argument field, indicating that the command is to display switchboard number 2, Enter/ Edit Other Data
Creating a Switchboard without the Manager
To create a switchboard from scratch, start with a blank form not bound to an underlying table or query; then add command buttons that trigger macros or event procedures to carry out the actions you want The properties of a switchboard form are quite different from the normal data entry form, which shows record navigation buttons, scroll bars, and other datarelated features You are not creating a real switchboard with a corresponding table or one that you can modify with the Switchboard Manager; you are instead creating a form that works like a switchboard but one over which you will have a lot more control Before you place command buttons on the form, change some of the form properties so it will appear more like a switchboard: Enter the text you want to see in the switchboard title bar in the Caption property box Make sure the Default View property is Single Form Leave the Allow Form View property as Yes and change the other four Allow properties to No Change Scroll Bars to Neither to remove both the horizontal and vertical scroll bars Change Record Selectors to No because there will be no data on the form Change Navigation Buttons to No because the user will not be moving among records Change Dividing Lines to No because the form won t display records Set Auto Resize to Yes so the form will always appear the same size in Form view Set Auto Center to Yes to ensure that the form opens in the middle of the window, and thus will be easier to view and use
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