Callum Brooks was left disappointed by the Magpies’ performance as his side’s FA Cup trail ended at Gang Warily.
Dorchester were sunk by a spectacular Charlie Gunson strike 11 minutes from time as Blackfield & Langley send the Magpies crashing out at the second qualifying round stage.
To add to the county town side’s woes loanee Jack Hoey suffered a broken arm in the clash.
Brooks said: “I don’t think there was anything major we could look back on and say we were really unlucky.
“I thought the overall picture was that we weren’t good enough when it mattered.
“We felt a couple of weeks ago in the league when we came up here we had to give a very good account of ourselves and we left something behind and again we leave with a real frustration.”