Brilliant thanks meratigoerr. I've amended it slightly as the images will always be held in the same location so now have
as an After Update event on the "Username" field which is now appending the value entered here to the end of the defined network path into the txtImageName field as I wanted. Thanks again....How can I thank you on the post as there doesn't appear to be a star at the bottom of the post frame!?
Me.txtImageName = "\\servername\share\pictures\" & Me.Username & ".jpg"
I didn't mean hide the txtImageName field, I meant hide the network path shown in this field so that only the filename that's getting appended appears!
@June7: I already have an Image Frame with a control source reading from the txtImageName so wanted to auto-populate the field based on the username which is also the same name as the image that will be stored on the network drive.