如何在C#或VB中改变虚拟键盘的语言？

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("user32.dll")]
    public static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll")]
    public static extern IntPtr GetKeyboardLayout(uint idThread);

    [DllImport("user32.dll")]
    public static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr lpdwProcessId);

    [DllImport("user32.dll")]
    public static extern IntPtr ActivateKeyboardLayout(IntPtr hkl, uint flags);

    static void Main(string[] args)
    {
        // 获取当前前台窗口句柄
        IntPtr foregroundWindow = GetForegroundWindow();

        // 获取前台窗口所属进程ID
        uint processId;
        GetWindowThreadProcessId(foregroundWindow, out processId);

        // 获取前台窗口的键盘布局
        IntPtr keyboardLayout = GetKeyboardLayout(processId);

        // 切换键盘布局为英文
        ActivateKeyboardLayout(new IntPtr(0x04090409), 0);

        Console.WriteLine("虚拟键盘语言已切换为英文。");
        Console.ReadLine();
    }
}