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