How to make a shape in visual basic go diagonal?

I'm making a game in visual basic called pong :) and I have 2 labels as the paddles and a circle shape as the ball. I have the collision statements for the ball and the labels. I also have the code for making the ball move which is ------> shpBall.Left = shpBall.Left + 60 <----- and the + is changed to - in a separate timer. Now I have no clue how to make something move diagonal is visual basic, Ive tried to look at other peoples code and forums and such but its just not clicking for me. I'm not asking for code at all I just want the HOW to be explained. Thanks in advance!