using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

    public class DetailRecord

    {

        private readonly string _originalText;

        static private Dictionary<string, Func<string,string>> _map = new Dictionary<string, Func<string,string>>

        {

            { "ContractNo", s => s.Substring( 1  , 10 )        },

            { "BankNum",    s => s.Substring( 15 ,  8 )        },

            { "ShortName",  s => s.Substring( 35 , 10 ).Trim() }

        };

        public DetailRecord(string originalText)

        {

            _originalText = originalText;

        }

        public string this[string key]

        {

            get

            {

                return _map[key](_originalText);

            }

        }

        public string BankNum

        {

            get { return this["BankNum"]; }

        }

        public string ContractNo

        {

            get { return this["ContractNo"]; }

        }

        public string ShortName

        {

            get { return this["ShortName"]; }

        }

        public bool IsValid

        {

            get

            {

                int dummy;

                if (!int.TryParse(this.ContractNo, out dummy)) return false;

                if (!Regex.IsMatch(this.BankNum, @"[A-Z]\d\d\s\s\d\d\d")) return false;

                return true;

            }

        }

    }

    public class Program

    {

        public static void Main()

        {

            var input = " 0759651386    X08  606 0209784104 BURTON                                             3334.24";

            var line = new DetailRecord(input);

            if (line.IsValid)

            {

                Console.WriteLine("Contract number: '{0}'", line.ContractNo);

                Console.WriteLine("Bank number: '{0}'", line.BankNum);

                Console.WriteLine("Short name: '{0}'", line.ShortName);

            }

        }

    }