Calculated control A control whose source of data is an expression rather than a field is a calculated control. You specify the value that you want in the control by defining an expression as the source of data for the control. An expression is a combination of operators (such as = and + ), control names, field names, functions that return a single value, and constant values. For example, the following expression calculates the price of an item with a 25 percent discount by multiplying the value in the Unit Price field by a constant value ().
The levels of human development have improved all over the world. Every developing region’s HDI value increased considerably between 1990 and 2015 ...
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