Gamepad.events.cs

Gamepad.GamepadAdded += GamepadAdded;
Gamepad.GamepadRemoved += GamepadRemoved;

private void GamepadAdded(object sender, Gamepad gamepad)
{
   Debug.WriteLine("A gamepad was connected");
}

private void GamepadRemoved(object sender, Gamepad gamepad)
{
   Debug.WriteLine("A gamepad was disconnected");
}

// Get all currently connected gamepads
var gamepads = Gamepad.Gamepads;