Question

I have a string that can look like this: 12345, this 123456 or this: 1234567.

I’d like to make each string look like this: 123-45, this: 1234-56 or this: 12345-67.

How can I do this in C#?

Answer 1

string myString = "1234567";   
if(myString.Length > 1)
   string dashed = myString.Insert(myString.Length - 2, "-");

EDIT: Added check based on comment, but depends on how such strings should be handled. (e.g. dashed even if length = 2?)