VB halp

Hey /prog/, i need some help in Visual Basic, I'm just learning and want to have the user input 2 numbers (each in a separate text box), then I want to have the program calculate a simple division of the numbers. How can I do this.

mpg = &txt1&/&txt2&
lst1.Items.Clear()
lst1.Text = mpg

thats what i have so far, but it doesnt like the &txt1&/&txt2& part. And I looked at tutorials, they dont answer my question.