[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);

        }