c# keyboardhook convert

Question

how it is possible to convert?

 

private void keyUp(KeyboardHook.VKeys key)

{

if (key == KeyboardHook.VKeys.SPACE)

{

textBox1.Text += " ";

}

else if (key == KeyboardHook.VKeys.KEY_0)

{

textBox1.Text += "0";

}

else if (key == KeyboardHook.VKeys.KEY_1)

{

textBox1.Text += "1";

}