using System.Runtime.InteropServices; [DllImport("user32.dll")] static extern void keybd_event(byte bVK, byte bScan, int dwFlags, int dwExtraInfo); const int KEYEVENTF_KEYUP = 0x02; private void button1_Click(object sender, EventArgs e) { textBox1.Focus(); keybd_event((byte)Keys.D0, 0, 0, 0); keybd_event((byte)Keys.D0, 0, KEYEVENTF_KEYUP, 0); } //위 코드를 테스트 해보..