using System;
using System.Security;
using System.Collections.Specialized;
using System.Runtime.InteropServices;

class Program
{
    [StructLayout(LayoutKind.Explicit)]
    public struct MyBool
    {
        [FieldOffset(0)]
        public byte Value1;

        [FieldOffset(0)]
        public bool Value2;
    }
    
    static void Main()
    {
        var ds = new SecretDataStorage();        
        var mb = new MyBool();            
        mb.Value1 = 128;        
        ds.GetData(null, mb.Value2);        
    }    
        
    public partial class SecretDataStorage
    {
        public string GetData(SecureString password, bool goodUser)
        {
            bool goodPass = CheckPass(password);
            
            if (!goodPass != goodUser && goodUser)
            {
                return ResolveSecretData(); // <= попасть сюды
            }

            return null;
        }
        
        private bool CheckPass(SecureString password)    
        {
            return false;
        }
        
        private string ResolveSecretData()
        {
            Console.WriteLine("We are here!");
            return "";
        }
    }
}