Hi Vlad What I meant was the instruction "ThisForm.txtGst.Value = ... && Your values here" that you had taught me works very well. Pior to that, I was trying for the whole morning and could not get it work. From Samuel > >Does it work now? If not, post your code here and me (or somebody else) >will tell you it doesn't work. > >Vlad > >>A thousand thanks Vlad. I have tried to figure out the whole morning and >could >>not get it work. >> >>Samuel >> >> >>> >>>In the Valid method of the txtSales: >>> >>>* Your calculations here >>>... >>>ThisForm.txtGst.Value = ... && Your values here >>> >>>Vlad >>> >>>>I'm very new to VFP 5.0. >>>>Can anyone help me on this: >>>> >>>>I have 2 textbox. txtSales and txtGst >>>> >>>>1. My intention was to key in the sale figures into "txtsales". When >the >>>users press enter after keying the sales figures, I want to do some >>>background caculation and display in "txtgst" textbox without user >keying. >>>Can anybody show me how? >>>> >>>>Many thanks. >>>> >>>> >>>>From Samuel Chan