SendKey.Send() Not working

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You can use WinAPI instead of SendKeys:

[DllImport("user32.dll", SetLastError = true)]
static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);
public static void PressKey(Keys key, bool up) {
    const int KEYEVENTF_EXTENDEDKEY = 0x1;
    const int KEYEVENTF_KEYUP = 0x2;
    if (up) {
        keybd_event((byte) key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr) 0);
    }
    else {
        keybd_event((byte) key, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr) 0);
    }
}

void TestProc() {
    PressKey(Keys.ControlKey, false);
    PressKey(Keys.P, false);
    PressKey(Keys.P, true);
    PressKey(Keys.ControlKey, true);
}

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