C#(Generate Random Number)

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Security.Cryptography;

using System.Text;

/// <summary>

/// Summary description for clsRandom

/// </summary>

public static class clsRandom

{

    public static string getNumber()

    {

        try

        {

            string strK = string.Empty;

            strK = GenerateRandomNumber().ToString();

            strK = Math.Abs(decimal.Parse(strK)).ToString();

            strK = decimal.Parse(strK).ToString("0000000000");

            strK = RandomString(8) + strK;

            return strK;

        }

        catch (Exception)

        {

            return null;           

        }

    }

    #region Random Number & Characters

    private static int GenerateRandomNumber()

    {

        try

        {

            byte[] byt = new byte[4];

            RNGCryptoServiceProvider rngCrypto =

                new RNGCryptoServiceProvider();

            rngCrypto.GetBytes(byt);

            int randomNumber = BitConverter.ToInt32(byt, 0);

            return randomNumber;

        }

        catch (Exception)

        {

            return 0;

        }

    }

    private static string RandomString(int size)

    {

        try

        {

            StringBuilder builder = new StringBuilder();

            Random random = new Random();

            char ch;

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

            {

                ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));

                builder.Append(ch);

            }

            return builder.ToString();

        }

        catch (Exception)

        {

            return null;

        }

    }

    #endregion Random Number & Characters

}