How to create a password based on some rules

Hi there

I have this code

 public static string GetUniqueKey(int maxSize)
        {
            char[] chars = new char[62];
            chars =
            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".ToCharArray();
            byte[] data = new byte[1];
            RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider();
            crypto.GetNonZeroBytes(data);
            data = new byte[maxSize];
            crypto.GetNonZeroBytes(data);
            StringBuilder result = new StringBuilder(maxSize);
            foreach (byte b in data)
            {
                result.Append(chars[b % (chars.Length)]);
            }
            return result.ToString();
        }

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var newPassword = GetUniqueKey(8);  

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I found an error with this, in that, I want to create a unique password, with the following:

AT LEAST

1 Uppercase
1 Lowercase
1 Number
... and MUST have at least 8 char

the problem with the code above is, it could create a password like KKoaoiuw

i.e. no number, or no lowercase etc

Does anyone know how to change it so that I have

AT LEAST

1 Uppercase
1 Lowercase
1 Number
... and MUST have at least 8 char


I found this reg exp

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d]{8,}$

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Dont know how to add that in, matter of fact dont know if it would help?
thanks