以编程方式登录到Windows XP

using System;
using System.Runtime.InteropServices;
using System.Threading;

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern void mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

public static void Login(string username, string password)
{
    // 输入用户名
    foreach (char c in username)
    {
        keybd_event((byte)c, 0, 0, 0);
        Thread.Sleep(100);
    }

    // 输入密码
    foreach (char c in password)
    {
        keybd_event((byte)c, 0, 0, 0);
        Thread.Sleep(100);
    }

    // 模拟回车键
    keybd_event(13, 0, 0, 0);
}

public static void Main(string[] args)
{
    string username = "your_username";
    string password = "your_password";

    Login(username, password);
}