Chart for .NET > User's Guide > Data Manipulation > Subset Operations > Evaluating 
The data series of Nevron Chart for .NET have builtin support for evaluating a subset of its data. In general evaluating represents the ability to execute a single argument function on a subset of the data contained in the data series.
The evaluation functionality is exposed by the Evaluate method of the NDataSeries class. The evaluation operations can be performed only on data series of type Double. If you attempt to execute the Evaluate method on a data series of other type the component will raise an exception. The Evaluate command receives two arguments  the single argument function which must be evaluated and the data series subset on which it must be performed. The method will return a double value representing the result of the function.
The following code retrieves the max value contained in the bar series Values data series.
C# 
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// create a subset containing all values NDataSeriesSubset subset; subset.AddRange(0, barseries.Values.Count); double dMaxValue = barseries.Values.Evaluate("MAX", subset); 
Visual Basic 
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' create a subset containing all values Dim subset As NDataSeriesSubset subset.AddRange(0, barseries.Values.Count) Dim dMaxValue As Double = barseries.Values.Evaluate("MAX", subset) 
The first argument of the Evaluate method is a string argument representing the function that must be performed. The following table describes the result which is returned by the supported functions.
Function  Result 

MIN  The minimum value contained in the subset 
MAX  The maximum value contained in the subset 
AVE  The average value contained in the subset 
SUM  The sum of the values contained in subset 
ABSSUM  The absolute sum of the values contained in the subset 
FIRST  The first value contained in the subset 
LAST  The last value contained in the subset 