/// 构造随机数 种子
static int GetRandomSeed()
{
      byte[] bytes = new byte[4];
      System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();
      rng.GetBytes(bytes);
      return BitConverter.ToInt32(bytes, 0);
} 
 
/// 生成随机 数
static int rnd() 
{
      
      Random ran = new Random(GetRandomSeed());     
      int cnt = ran.Next(0,59);
      return cnt;
 }