Adding the value of 4 textboxes

[brucey54]

Hi folks, I need to add 4 textboxes, I was think of adding within the Control Source of another textbox like so

textbox= ([textbox1]) + ([textbox2]) + ([textbox3]) + ([textbox4])

But if any of the textboxes are null, the formula does not work!!

 

[Ranman256]

Nz(txtBox1) + nz(txtBox2)....

 

[brucey54]

Great thanks