public void register_hotkeys() { hook = new Hotkeys(); hook.KeyPressed += hook_KeyPressed; try { hook.RegisterHotKey(global::ModifierKeys.Control | global::ModifierKeys.Shift, Keys.D3); hook.RegisterHotKey(global::ModifierKeys.Control | global::ModifierKeys.Shift, Keys.D4); hook.RegisterHotKey(global::ModifierKeys.Control | global::ModifierKeys.Shift, Keys.D5); } catch { MessageBox.Show("Couldn't register hotkeys. Perhaps they are already in use or try running as an Administrator.", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error); } }