problem - searching record

I'm converting a vb6 project to vb.net 2019.. I have an inventory table that has approx 18,000 rows.. I create a recordset sorted by dept,class,and seqnum. In vb6 I used a dao recordset and set the recordset.index property and then used the recordset.seek to find the row. I could then move forward and back in the table with the recordset.movenext etc..
I want to select a row and then moveback or forward to other items in the table as per the sort order of the index.....