Message informing when the stock is egual or minimum

Question

Hi!

 

I need to have a message saying that the stock is minimum. How can I say if the number is egal or minus to 5 into my textbox1 say Stock is minimum.

 

private void button1_Click(object sender, EventArgs e)

{

if (textbox1 >= 5)

MessageBox.Show('Stock is minimum');

}