Quick solution to C# verification code problem

The code is as follows:

string ss = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
      Random a = new Random();
      int b;
      string yan = "";
      for (int i = 0; i &lt; 4; i++)
      {
        b = (62);
        yan += (b, 1);
      }
      ("The verification code is:" + yan);
      ("Please enter the verification code:");
      string c = ();
      if (() == ())
      {
        ("The verification code is correct!");
      }
      else
      {
        ("Verification code error!");
      }
      ();

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