Returns a string that represents the value of this Tuple`3 instance.
The string representation of this Tuple`3 object.
The string returned by this method takes the form (Item1, Item2, Item3), where Item1, Item2, and Item3 represent the values of the Tuple`3.Item1, Tuple`3.Item2, and Tuple`3.Item3 properties, respectively. If any of the property values is null, it is represented as string.Empty.