i was created a form then a button to print preview a report.i have set a criteria in query in s/n field like this [Forms]![EXAM PAPER ENTRY FORM]![EXAM S/N].the problem is when a user click a print preview button,then a parameter dialog box appear for a user put it a serial number again for print preview.how to remove that parameter dialog box ?

i was created a form then a button to print preview a report.i have set a criteria in query in s/n field like this [Forms]![EXAM PAPER ENTRY FORM]![EXAM S/N].the problem is when a user click a print preview button,then a parameter dialog box appear for a user put it a serial number again for print preview.how to remove that parameter dialog box ?
You are missing that field in your query I believe.... or you have reference name wrong. You should not use "/" in a field name, if anything use SN or S_N and change the label for that field to whatever you wish the user to see!

Keep the Form open while the Report is opening