excel - Error message if no data entered in text box -

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please suggest vb code, if text box left blank,and during tab/enter, error message box appears each text box.

private sub commandbutton1_click()    sheets("attendance").select    range("a1").select          if isempty(activecell) = false          activecell.offset(1, 0).select       end if    loop until isempty(activecell) = true     activecell.value = me.d.value    activecell.offset(0, 1).select    activecell.value = me.n.value    activecell.offset(0, 1).select    activecell.value = me.salary.value    activecell.offset(0, 1).select    activecell.value = me.remarks.value    activecell.offset(0, 1).select    activecell.value = me.it.value    activecell.offset(0, 1).select    activecell.value = me.outtime.value    activecell.offset(0, 1).select    activecell.value = me.lunch.value    activecell.offset(0, 3).select    activecell.value = me.advance.value    activecell.offset(0, 2).select    activecell.value = me.paid.value end sub

please see below sub , try user form.

    private sub textbox1_exit(byval cancel msforms.returnboolean)         if me.textbox1 = ""             msgbox "you must enter value!"             cancel = true             me.textbox1.setfocus         end if     end sub

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