1 public static bool PasswordStrength(string password)
 2 {
 3     if (password.Length <8)
 4     {
 5         return false;
 6     }
 7     if (0 - Convert.ToInt32(Regex.IsMatch(password, "[a-z]")) 
 8           - Convert.ToInt32(Regex.IsMatch(password, "[A-Z]")) 
 9           - Convert.ToInt32(Regex.IsMatch(password, "\\d")) 
10           - Convert.ToInt32(Regex.IsMatch(password, ".{10,}")) <= -2)
11     {
12         return true;
13     }
14     else
15     {
16         return false;
17     }
18 }