using System;

using System.Text.RegularExpressions;

public class Program

{

        public static void Main(){

            //RENAVAM Válido 72570583222

            //Gerador RENAVAM http://gerador.info/renavam

            Console.WriteLine(isRENAVAM("72570583222"));

        }

​

        public static bool isRENAVAM(string RENAVAM)

        {

            if (string.IsNullOrEmpty(RENAVAM.Trim()))

                return false;

​

            string SoNumero = Regex.Replace(RENAVAM, "[^0-9]", string.Empty);

​

            if (string.IsNullOrEmpty(SoNumero) || new string(SoNumero[0], SoNumero.Length) == SoNumero)

                return false;

​

            int[] d = new int[11];

            string sequencia = "3298765432";

​

            SoNumero = Convert.ToInt64(SoNumero).ToString("00000000000");

​

            int v = 0;

        for (int i = 0; i < 11; i++)

            d[i] = Convert.ToInt32(SoNumero.Substring(i, 1));

​

        for (int i = 0; i < 10; i++)

            v += d[i] * Convert.ToInt32(sequencia.Substring(i, 1));

​

        v = (v * 10) % 11;

        v = (v != 10) ? v : 0;

​

        return (v == d[10]);

    }

}

​