如何检查DLL文件是否已注册？

using System;
using System.Runtime.InteropServices;

public class DLLChecker
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern IntPtr LoadLibrary(string dllToLoad);

    public static bool IsDLLRegistered(string dllPath)
    {
        IntPtr hModule = LoadLibrary(dllPath);
        if (hModule == IntPtr.Zero)
        {
            return false;
        }
        return true;
    }
}