create qr code vb.net Click the Label tool in the toolbox and draw a label control next to the Employee label in Visual Studio .NET

Drawer Code-128 in Visual Studio .NET Click the Label tool in the toolbox and draw a label control next to the Employee label

6 Click the Label tool in the toolbox and draw a label control next to the Employee label
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in the Page Header. Type Charge in the label and press Enter. (If you don t type anything, the label disappears when you select away from it.)
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7 The default label control in the Bold style has a red font and is Arial 9 point, but the
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other labels are black and Arial 10 point. You can click one of the other labels in the page header, click the Format Painter button on the toolbar, and then click your new label to transfer the format.
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8 Make the new label the same height as the other labels in the page header and give it
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the same width as the text box below it (0.75 inches). Align the left edge of the label with the left edge of the text box, and the top of the label with the top of the other labels in the section. Your report in Design view should now look like Figure 16-11. 574
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Part 3: Creating Forms and Reports in a Desktop Application
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Figure 16-11. Adding an expression to calculate daily revenue.
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F16QQ12
Figure 16-12. The calculated detail line values within a group in Print Preview.
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Inside Out
Avoiding #Error in a Calculated Control Instead of starting with an unbound text box to perform a calculation, you might decide to drag and drop one of the fields that you ll use in the calculation from the field list onto your report. When you do that, Access gives the text box the same name as the field. If you modify the control source to an expression that uses the field, you ll see #Error in the text box when you view or print the report.
Part 1: Part Title
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Figure 16-12 shows the result in Print Preview. (The figure shows data from the third page of the report.) You can see that Access has performed the required calculations for each day of each reservation.
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Part 3: Creating Forms and Reports in a Desktop Application
Microsoft Office Access 2003 Inside Out
When you enter a name in an expression, Access first searches for another control that has that name. If it doesn t find the control, then it looks in the field list. So, if the name of the control is TotalCharge and you include an expression that uses [TotalCharge], the expression is referencing itself! Access can t figure out how to display the value of the TotalCharge text box, so it displays #Error instead. If you decide to drag and drop a field that you ll change to an expression, be sure to change the Name property of the control (for example, txtTotalCharge) before you enter the expression. Of course, you ll also see #Error if your expression references a function that doesn t exist or provides invalid parameters to a function. However, using the name of the control itself inside the expression that is the control source is one of the most common sources of #Error.
Part 1: Part Title
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Adding Values Across a Group
Another task commonly performed in reports is adding values across a group. In the previous chapter, you saw a simple example of this in a report that used the built-in Sum function. In the Facility Occupancy By Date report, you have three levels of grouping: one by facility, another by month, and another by date. When you specified sorting and grouping criteria earlier in this chapter, you asked Access to provide group footers. This gives you sections in your report in which you can add unbound controls that use any of the aggregate functions (Sum, Min, Max, Avg, Count, First, Last, StDev, or Var) in expressions to display a calculated value for all the rows in that group. In this example, you can create unbound controls in the Facility and both DateValue footers to hold the totals by facility, by month, and by date, for the daily charge for each room, as shown in Figure 16-13. In the Control Source property of each text box control, enter: =Sum(CCur(Round([TotalCharge]/([CheckOutDate] [CheckInDate]),2))) Notice in this case, you must repeat the original expression inside the aggregate function. (See the tip on this page for an explanation.) Tip How to calculate totals on expressions An important point to remember about using an aggregate expression in a group section is that the expression cannot refer to any calculated controls in the Detail section. As you ll learn later, you can reference an outer control from an inner one (for example, a total calculation in a group from inside the Detail section), but not vice-versa. So, you cannot create a calculated field in the Detail section, for example, that multiplies two numbers and then reference that control in the summary expression. You can, however, repeat the calculation expression in the summary. If a detail control named Total has an expression such as =[Quantity] * [Price], you must use an expression such as =Sum([Quantity] * [Price]) in your grouping section, not =Sum([Total]). You should also add a line control at the top of each footer section to provide a visual clue that the values that follow are totals. In this example, I placed lines approximately 4.5 inches 576
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