无法从C#项目中的VB.NET项目获取布尔值

using System;
using System.Runtime.InteropServices;

namespace CSharpProject
{
    class Program
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct MyStruct
        {
            public bool myBool;
        }

        [DllImport("VBProject.dll")]
        public static extern IntPtr GetBoolValue();

        static void Main(string[] args)
        {
            IntPtr ptr = GetBoolValue();
            MyStruct myStruct = (MyStruct)Marshal.PtrToStructure(ptr, typeof(MyStruct));
            bool boolValue = myStruct.myBool;

            Console.WriteLine("Bool value: " + boolValue);
        }
    }
}