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With a List<String> you can edit an item simply with this:
var index = List.FindIndex(s => s.Number == box.Text);
List[index] = new String;
But, how to apply it on a List<Tuple<string, string>> for example?
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Once a tuple is created, you cannot change its values. Tuples are unchangeable, or immutable as it also is called. But there is a workaround. You can convert the tuple into a list, change the list, and convert the list back into a tuple.
Use the + operator to add a value to a tuple Add parentheses around the added value with a comma before the right parentheses to make it a tuple with one value. Use concatenation to add the previous tuple to the end of the original tuple to create a new tuple with an added value at the end.
You can't add elements to a tuple because of their immutable property. There's no append() or extend() method for tuples, You can't remove elements from a tuple, also because of their immutability.
You can find the index in a similar way - by applying a condition to each tuple from the list:
var index = listOfTuples.FindIndex(t => t.Item1 == box1.Text || t.Item2 == box2.Text);
You can replace an item by calling Tuple.Create:
listOfTuples[index] = Tuple.Create(box3.Text, box4.Text);
var tuple = List.Find(s => s.Item1 == box.Text);
//assuming you're searching for the first string, but you can change the predicate anyway.
tuple = new Tuple<string, string>(new String, tuple.Item2);
As mentioned in the other answer, you can of course use the index too, but you can also just find the object and update it, that should work as well.
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