How to mask string?

Question

I have a string with value "1131200001103".

How can I display it as a string in this format "11-312-001103" using Response.Write(value)?

Thanks

Answer 1

This produces the required result

string result = Int64.Parse(s.Remove(5,2)).ToString("00-000-000000");

assuming that you want to drop 2 characters at the position of the 2 first nulls.