Using the ReportItems Collection in VS .NET

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Using the ReportItems Collection
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The ReportItems collection contains the report s textboxes as objects. You can use a report item expression to display the value of a textbox in a separate textbox or to use a textbox s value as part of a separate calculation. Report item expressions are similar to global variables because they are evaluated by Reporting Services after processing completes but before rendering. Field expressions in detail and aggregated rows must be evaluated first from the dataset so a textbox has a value that can be used by the report item expression. Report item expressions, therefore, are useful in situations in which a calculation can be performed only after the dataset is aggregated, and the calculation cannot be derived directly from the dataset. For example, to calculate subtotals in the table, the Sum function is used with a field expression. However, if the field expression evaluates as a percentage, the Sum function is no longer applicable because percentages are not additive. Specifically, a percentage value in the table footer cannot be calculated by summing percentage values in the detail rows. When working with nonadditive values like ratios or percentages, you must perform the division on aggregated values. To accomplish this, you can use a report item expression to summarize percentage values in rows in which you are using subtotals.
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Working with Expressions
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A report item expression used in a textbox that is inside a data region can retrieve the value of a textbox that is either on the same level or a higher level if the data region has grouping defined. This means that you cannot use an expression in a summary row that refers to a textbox in a detail row. Essentially, this is because the report item expression in a data region is acting as a pointer to one other textbox at a time, and therefore can retrieve only one result. Because multiple rows can be on a lower level, there is no way to identify which one of those rows contains the value that the report item expression should retrieve. In this procedure, you ll add report item expressions to calculate the margin percentage in the detail and summary rows of the table. Add report item expressions to the table 1. Click the Layout tab, click the table, right-click the Margin column handle, and then click Insert Column To The Right. 2. In the last cell of the table header, type Margin %. 3. Click the Margin % column handle to select all cells in the column, and then type P1 in the Format property to display the expression as a percentage with one decimal place. 4. Right-click the last cell in the detail row, click Expression, enter the following expression in the Expression pane, and then click OK.
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=ReportItems!Margin.Value/ReportItems!SalesAmount.Value
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You can also type the expression directly into the textbox, but the width of the textbox often makes it difficult to see what you re doing when working with longer expressions. Another way to edit the expression is to click <Expression > in the Value property for the textbox in the Properties window.
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This expression retrieves the value from the Margin textbox, and then divides the value by the value in the SalesAmount textbox. This calculation is performed for each detail row of the report. You could also use the expression =Fields!Margin.Value/Fields! SalesAmount.Value to get the same result, but for now, use the ReportItems collection so you can learn something about its behavior in the upcoming steps. 5. Enter the following expression in the last cell of the table footer:
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=Sum(ReportItems!Margin.Value)/Sum(ReportItems!SalesAmount.Value)
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This expression is not valid, but is introduced here to force an error for you to look at shortly.
Part II:
Authoring Reports
6. Click the Preview tab. Your screen looks like this (although the sequence of errors may differ):
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