判断NumLock键和CapsLock键是否被锁定

        [DllImport("user32.dll",EntryPoint="GetKeyState")]
        public extern static int GetKeyState(int intkey);
        private void button1_Click(object sender, EventArgs e)
        {
            string str="判断NumLock键和CapsLock键是否被锁定:\n";
            int intCapsLock=GetKeyState(20);
            if(intCapsLock==0)
            {
                str+="CapsLock键没有被锁定\n";
            }else
            {
                str+="CapsLock键已经被锁定\n";
            }
            int intNumLock=GetKeyState(145);
            if (intNumLock == 0)
            {
                str+="NumLock键没有被锁定\n";
            }else
            {
                str+="NumLock键已经被锁定\n";
            }
            MessageBox.Show(str,"提示",MessageBoxButtons.OK);
        }