Create a random number

This will create a 10-digits random number

public static string CreateRandomNumber()
{
return GenerateRandomPhoneNumber(3);
}

private static string GenerateRandomPhoneNumber(int seed)
{
string phoneNumber = String.Empty;

Random random = new Random((int)(DateTime.Now.Ticks % 5000000000 + seed));

phoneNumber += random.Next(1, 10).ToString();

for (int i = 0; i < 9; i++)
{
phoneNumber += random.Next(0, 10).ToString();
}

return phoneNumber;
}