如何在C#中调用"CreateFile"？

using System;
using System.Runtime.InteropServices;

public class Win32
{
    public const int FILE_ATTRIBUTE_NORMAL = 0x80;
    public const int FILE_FLAG_OVERLAPPED = 0x40000000;
    public const int GENERIC_READ = unchecked((int)0x80000000);
    public const int GENERIC_WRITE = 0x40000000;
    public const int OPEN_EXISTING = 3;

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern IntPtr CreateFile(
        string lpFileName,
        int dwDesiredAccess,
        int dwShareMode,
        IntPtr lpSecurityAttributes,
        int dwCreationDisposition,
        int dwFlagsAndAttributes,
        IntPtr hTemplateFile);
}

public class Program
{
    static void Main(string[] args)
    {
        string fileName = "example.txt";
        IntPtr handle = Win32.CreateFile(
            fileName,
            Win32.GENERIC_READ | Win32.GENERIC_WRITE,
            0,
            IntPtr.Zero,
            Win32.OPEN_EXISTING,
            Win32.FILE_ATTRIBUTE_NORMAL,
            IntPtr.Zero);

        if (handle == (IntPtr)(-1))
        {
            Console.WriteLine("Error: Unable to create file.");
        }
        else
        {
            Console.WriteLine("File created successfully.");
            // Perform operations on the file using the handle
            // ...
            // Close the file handle
            // ...
        }
    }
}