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    public FunctionValue CustomFunctionCalculate(IList<FunctionValue> args, Cell currentCell)
    {
        StringBuilder result = new StringBuilder("");
 
 
        foreach (FunctionValue arg in args)
            if (arg.Type != FunctionValueType.RANGE)
                result.Append(arg);
 
 
        return new FunctionValue(result.ToString());
    }

    Public Function CustomFunctionCalculate(args As IList(Of FunctionValue), currentCell As Cell) As FunctionValue
        Dim result As New StringBuilder("")
        For Each arg As v In args
            If arg.Type <> FunctionValueType.RANGE Then
                result.Append(arg)
            End If
        Next
        Return New FunctionValue(result.ToString())
    End Function