using System;

using System.Text;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string newCorrectValue =MaxLength("C/ Clara Campoamor Rodríguezííí 1",30,false);

​

        Console.WriteLine("-----New Value------");

        Console.WriteLine(newCorrectValue);

        Console.WriteLine("New Data Length:{0}", newCorrectValue.Length);

        Console.WriteLine("-----------");

    }

    public static string MaxLength(string data, int maxLength, bool returnAsEmpty)

        {

            if (returnAsEmpty)

            {

                return "";

            }

​

            var newData = "";

​

            Int16 index = 0;

            var listOfIndexes = new List<Int64>();

            Int16 lengthWithMultiByte = 0;

            foreach (char c in data)

            {               

                if (c > 128)

                {

                    listOfIndexes.Add(index);

                    lengthWithMultiByte++;

                }

               index++;

                lengthWithMultiByte++;

            }

​

            Int16 newIndex = 0;

            foreach (char c in data)

            {

                if ((listOfIndexes.Contains(newIndex)) && (lengthWithMultiByte < maxLength))

                {

                    var tempBytes = System.Text.Encoding.GetEncoding("ISO-8859-8").GetBytes(c.ToString());

                    newData = newData + System.Text.Encoding.UTF8.GetString(tempBytes);

                    lengthWithMultiByte--;

                }

                else

                {

                    newData = newData + c;

                }

                newIndex++;

            }

​

            /* Start Insert by Juma */

            Console.WriteLine("Data Length before trim:{0}", data.Length);

            Console.WriteLine("New Data Length before trim:{0}", newData.Length);

            /* End Insert by Juma */

            Console.WriteLine("{0} -----> {1}", data, newData);

            Console.WriteLine("");

            if (newData.Length < maxLength)

            {

                return newData;

            }

            else

            {

                return newData.Substring(0, maxLength);

            }

        }

}