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Calculate allows you to add extensive calculation support to your business objects in Windows Forms, ASP.NET, WPF, and Silverlight applications. Easily set up forms that have calculation dependencies among various controls. Calculate comes with a function library of more than 400 entries, and it supports cross-sheet references. When used in conjunction with Essential XlsIO, you can fully load, manipulate, and compute Excel worksheets with no dependence on Excel.

Excel-Like Calculations without Excel

Excel-like calculation without Excel can be achieved easily and efficiently. All the functions carried out in Excel can be used to perform the required calculations. Moreover, calculate plus Essential XlsIO can be used to get, set, and access the values.

Calculate + Essential XlsIO

Calculate lets you add calculation support to objects by implementing an ICalcData interface. CalcQuick and CalcDataGrid both implement ICalcData, which gives them their calculation support. ICalcData is designed around a rectangular array of data, but this rectangular design can be hidden as seen in CalcQuick

ICalcData for Data Objects

ICalcData adds the calculation support to the grid. By implementing the interface, grid is able to perform the calculations and there are methods and events available in ICalcData that are used to get, set, and access the values.

ICalcData Interface

Calculate lets you add calculation support to objects by implementing an interface, ICalcData. CalcQuick and CalcDataGrid both implement ICalcData, which gives them their calculation support. ICalcData is designed around a rectangular array of data. This rectangular design can be hidden, just as in CalcQuick.

Methods and Events

There are four members of the ICalcData interface, three methods, and one event. Two of the methods are used to get and set values, one method gives you access to the object after it has been created, and the event is used to notify listeners when values change.


CalcQuick will allow you to add calculation support. This support can be given to anything, like a collection of text boxes or combo boxes. The use of an indexer will let you to add the formula or values. Moreover, it facilitates both automatic and manual calculations.

Use with Arbitrary Objects

Use CalcQuick to add calculation support to just about anything. You can register values or formulas using an indexer on the CalcQuick object. Following this, the act of retrieving a value through the CalcQuick indexing triggers the calculation.

A single command can add calculation support to a collection of text box and combo box controls. The following form allows you to select a formula and calculate the result based on the user-entered values.

Automatic and Manual Calculations

Properties let you control whether changes to values tracked by a CalcEngine object automatically trigger dependent calculations. Turning off this auto calculation support lets you quickly change many values and then do the calculation only when all updates are completed.


The CalcDataGrid class enables support for calculations on a Windows Forms data grid. It allows you to use Excel-like formulas to calculate values that depend on other cells’ values. Calculate can manage multiple data-bound grid objects. You can also have formulas with reference values from one grid in another grid. Calculate also provides support for sheet ranges. Setting the CalcEngine.SupportsSheetRanges property to True makes the engine support sheet ranges such as “=SUM(Sheet1:Sheet3!A1)” and “=SUM(Sheet1:Sheet3!A1:B4)”.

Functions Library

Function libraries provide both custom functions and predefined functions. Almost all the calculate functions are available and made easier to implement.

Custom Functions

You can add functions by writing a method that defines the calculation and registering a delegate for this method with calculate. The class library has helper methods that can be used to retrieve lists of values and compute formulas, if needed, to manage custom functions. Helper methods can also be directly accessed to parse and compute formulas for use in code.

List of Functions

Calculate contains a library of more than 400 functions ready for your use. The functions used range from standard mathematical functions such as cosine and sine, to statistical functions like averages and standard deviations, and even financial functions (declining balance and future value, for example).

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