public static string GenerateRandomPassword(PasswordOptions opts = null)
{
    if (opts == null) opts = new PasswordOptions()
    {
        RequiredLength = 8,
        RequiredUniqueChars = 4,
        RequireDigit = true,
        RequireLowercase = true,
        RequireNonAlphanumeric = true,
        RequireUppercase = true
    };
 
    string[] randomChars = new [] {
        "ABCDEFGHJKLMNOPQRSTUVWXYZ",    // uppercase 
        "abcdefghijkmnopqrstuvwxyz",    // lowercase
        "0123456789",                   // digits
        "!@$?_-"                        // non-alphanumeric
    };
    Random rand = new Random(Environment.TickCount);
    List<char> chars = new List<char>();
 
    if (opts.RequireUppercase)
        chars.Insert(rand.Next(0, chars.Count), 
            randomChars[0][rand.Next(0, randomChars[0].Length)]);
 
    if (opts.RequireLowercase)
        chars.Insert(rand.Next(0, chars.Count),
            randomChars[1][rand.Next(0, randomChars[1].Length)]);
 
    if (opts.RequireDigit)
        chars.Insert(rand.Next(0, chars.Count),
            randomChars[2][rand.Next(0, randomChars[2].Length)]);
 
    if (opts.RequireNonAlphanumeric)
        chars.Insert(rand.Next(0, chars.Count),
            randomChars[3][rand.Next(0, randomChars[3].Length)]);
 
    for (int i = chars.Count; i < opts.RequiredLength 
        || chars.Distinct().Count() < opts.RequiredUniqueChars; i++)
    {
        string rcs = randomChars[rand.Next(0, randomChars.Length)];
        chars.Insert(rand.Next(0, chars.Count), 
            rcs[rand.Next(0, rcs.Length)]);
    }
 
    return new string(chars.ToArray());
}

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