how to enter value as password mode in sql 2005 database

public string GetEncryptedPassword(string password)
    {
        string newPass = string.Empty;
        
        int num = new Random().Next(1, 10);
        foreach (char ch in password)
        {
            newPass += (char)(ch + num);
        }
        newPass += (char)num;
        return newPass;
    }

public string GetDecryptedPassword(string password)
    {
        string decryptedPassword = string.Empty;
        int num = (int)password[password.Length - 1];
        password = password.Remove(password.Length - 1, 1);
        foreach (char ch in password)
        {
            decryptedPassword += (char)(ch - num);
        }
        return decryptedPassword;
    }