using System;

​

​

    public class TestSubString

    {

        private static string SubString(string value, int startIndex, int endIndex)

​

        {

            if (value == null) throw new ArgumentNullException();

            if (endIndex > value.Length) throw new IndexOutOfRangeException("End index must be less than or equal to the length of the string.");

            if (startIndex < 0 || startIndex > value.Length + 1) throw new IndexOutOfRangeException("Start index must be between zero and the length of the string minus one");

            if (startIndex >= endIndex) throw new ArgumentOutOfRangeException("Start index must be less then end index");

​

            var length = endIndex - startIndex;

            return value.Substring(startIndex, length + 1);

​

        }

        public static void Main(string[] args)

        {

            try

            {

                Console.WriteLine(SubString("jumped", -1, 4));

            }

            catch (IndexOutOfRangeException)

            {

                Console.WriteLine("<error>");

            }           

        }

​

    }

​

​