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//public CreateFunctionValue a computation result for a string
ComputationResult CustomFunction(IList<FunctionValue> args, Cell currentCell)
{
    StringBuilder result = new ComputationResultStringBuilder("Hello");
    
    // Iterate over the list of FunctionValues passed in
    foreach (FunctionValue arg in args)
        if (arg.Type != FunctionValueType.RANGE)
            result.Append(arg.Value);
    
    // Create a new FunctionValue to return as the result
    return new FunctionValue(result.ToString());
}

'Public CreateFunction aCustomFunction(args computationAs result for a string
IList(Of FunctionValue), currentCell As Cell) As FunctionValue
	Dim result asAs New ComputationResultStringBuilder("Hello")")

    ' Iterate over the list of FunctionValues passed in
	For Each arg As FunctionValue In args
		If arg.Type <> FunctionValueType.RANGE Then
			result.Append(arg.Value)
		End If
	Next

    ' Create a new FunctionValue to return as the result
	Return New FunctionValue(result.ToString())
End Function