Question

For 2 value set data, it is clear I can use Dictionary. Forexample: if I have “Name” and “position” as key value pair I can use Dictionary.

What about 3 value set? What is the proper dataset I should use? I have Name, level, position. and the only thing unique is the position.

ie

Item1, port0, line20; 
Item1, port1, line21; 
Item2, port0, line22; 
Item2, port1, line23;

Answer 1

Why not just create a appropriate class? It’s simple, it’s short, it’s meaningful.

public class FooBar
{
    public string Name {get; set;}
    public string Level {get; set;}
    public string Position {get; set;}
}

And then put it into a List<FooBar> or Dictionary<string, FooBar> (where the key is the Position).

Creating a List or Dictionary allows you to fetch items easily by its properties

var list = new List<FooBar>() {..., ..., ...};
var item = list.Single(f => f.Position == "line21"); // etc.
var other = list.Single(f => f.Name == "Item1");