Динамическая загрузка DLL

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Runtime.Serialization.Formatters.Binary;
 
namespace LoadDLL_Delphi_C
{
    class DynDllImport
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        [ResourceExposure(ResourceScope.Process)]
        public static extern IntPtr LoadLibrary(string libFilename);
 
        [DllImport("kernel32.dll", CharSet = CharSet.Ansi, BestFitMapping = false, ThrowOnUnmappableChar = true)]
        static internal extern IntPtr GetProcAddress(IntPtr HModule, [MarshalAs(UnmanagedType.LPStr), In] string funcName/*lpcstr*/);
 
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        [ResourceExposure(ResourceScope.Process)]
        public static extern bool FreeLibrary(IntPtr hModule);
    }
 
    public partial class Form1 : Form
    {
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int DllMessage(
            byte[] text,
            int count);
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            IntPtr pDll = DynDllImport.LoadLibrary("Project1.dll");
            if (pDll == IntPtr.Zero)
                throw new Win32Exception();
 
            IntPtr pProc = DynDllImport.GetProcAddress(pDll, "DllMessage");
            if (pProc == IntPtr.Zero)
                throw new Win32Exception();
 
            var DllMessageDelegate = (DllMessage)Marshal.GetDelegateForFunctionPointer(pProc, typeof(DllMessage));
            byte[] bytes = Encoding.Unicode.GetBytes("Раз два три");
            int count = bytes.Length;
            DllMessageDelegate(bytes, count);
 
            bool isFreed = DynDllImport.FreeLibrary(pDll);
 
            if (!isFreed)
                Console.WriteLine("Library could not be freed.");
 
            Console.ReadLine();
 
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            string path = Directory.GetCurrentDirectory() + @"\Project1.dll";
            if (!File.Exists(path))
                return;
 
            button1.Text = "OK";
        }
    }
}

byte[] text

int count