C#控制键盘按键(大小写按键等)的代码

将代码过程较好的代码段做个记录，如下的资料是关于C#控制键盘按键(大小写按键等)的代码。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace sn设置键盘大小写
{
public partial class Form1 : Form
{
const uint KEYEVENTF_EXTENDEDKEY = 0x1;
const uint KEYEVENTF_KEYUP = 0x2;

[DllImport("user32.dll")]
static extern short GetKeyState(int nVirtKey);
[DllImport("user32.dll")]
static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

public enum VirtualKeys : byte
{
VK_A = 62
}

public Form1()
{
InitializeComponent();
}

public static bool GetState(VirtualKeys Key)
{
return (GetKeyState((int)Key)==1);
}
public static void SetState(VirtualKeys Key, bool State)
{
if (State != GetState(Key))
{
keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | 0, 0);
keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
}

private void btnOpenCAPITAL_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_CAPITAL, true);
}

private void btnCloseCAPITAL_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_CAPITAL, false);
}

private void btnOpenScroll_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_SCROLL, true);
}

private void btnCloseScroll_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_SCROLL, false);
}

private void btnOpenNum_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_NUMLOCK, true);
}

private void btnCloseNum_Click(object sender, EventArgs e)
{
SetState(VirtualKeys.VK_NUMLOCK, false);
}

}
}