How to generate random string with alphanumeric in asp.net

 public string generaterandomno()
    {
 
        string aa = "1234567890qwertyuiopasdfghjklzxcvbnm";
        string R_code = "";
        Random rnd = new Random();
        for (int i = 0; i < 8; i++)
        {
            int a = rnd.Next() % (aa.ToString().Length - 1);
            R_code += aa[a];
        }

       return R_code;
    }

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