[RESOLVED] Noob here and I need some simple help

[<-Sythe-<<]

OK im new to this sight and could use some help. I am Makeing a simple program that will work but if you donot put ant thing in the spacesit messes up. its pretty much a a program for easy use of the distance formula.

heres the code i have all i need to program in is some way if the box is left blank then it equals 0

Private Sub cmdAdd_Click()
X1 = txtX1.Text
Y1 = txtY1.Text
X2 = txtX2.Text
Y2 = txtY2.Text
B = (X1 - X2) ^ 2 + (Y1 - Y2) ^ 2
B = Sqr(B)
picAnswer.Print B
End Sub

if you guys can help I would really apprieate it