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Compare two password values to ensure that at least 4 characters have changed

/ Published in: C#
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  1. public bool ComparePasswords(string OldPassword, string NewPassword)
  2.     {
  3.         bool match4 = true;
  4.         int diffCount = 0;
  5.         ArrayList list = new ArrayList();
  6.         string s = OldPassword;
  7.         string t = NewPassword;
  8.  
  9.         for (int i = 0; i < s.Length; i++)
  10.         {
  11.             if (i >= t.Length)
  12.             {
  13.                 break;
  14.             }
  15.             else if (s[i] != t[i])
  16.             {
  17.                 diffCount++;
  18.             }
  19.             else if (s[i] == t[i])
  20.             {
  21.                 diffCount = 0;
  22.             }
  23.  
  24.             if (diffCount == 4)
  25.             {
  26.                 match4 = false;
  27.                 break;
  28.             }
  29.         }
  30.  
  31.         return match4;
  32.     }

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