Convert List<int> to delimited string list

UPDATED to use List<int> instead of List<string>

Use string.Join:

List<int> data = ..;
var result = string.Join(";", data); // (.NET 4.0+)
var result = string.Join(";", data.Select(x => x.ToString()).ToArray()); // (.NET 3.5)

string.Join(";", myList.ToArray());

Just use the join

string combinedString = String.Join(";", arrayName);