access can't find the field '|' referred to in expression -

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i encountered error 'microsoft office access can't find field '|' referred in expression" when using dcount function count number of orderno occurence in table. datatype orderno number. here's i've done 

if dcount("[orderno]", "tbldisposition", "[orderno]='" & [txtorderno.value] & "'") > 1     msgbox "duplicate data", vbokonly, "error" else     msgbox "succeed" end if

on form's load event set txtorderno control source orderno in tbldisposition. try use dlookup function , seems same errors.

the expression [txtorderno.value] looks wrong. try without square brackets, e.g:

if dcount("[orderno]", "tbldisposition", "[orderno]=" & txtorderno.value) > 1     msgbox "duplicate data", vbokonly, "error" else     msgbox "succeed" end if

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