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I am developing a database program.i am using adodb.Suppose user entered records in table with one primary keyfield.Next time when user add new record by Clicking add button recordset.addnew procedure will be executed which appends blank record .user will enter keyfield in textbox and press enter.when he press enter in code some procedure should execute which find whether this keyfield is already there or not.If by mistake user is making duplicate entry, message should pop up as "Record already exists" and cancel addnew procedure and show contents of that record.if it's not duplicate entry then it should follow normal procedure.
I have little idea how to do it but please guide me in details .please help me urgently.