The AGM saw the unprecedented secret ballot voting for election of office bearers conducted by the national elections department officials.
Dharmadasa succeeded his brother Upali as the latter's nomination and that of two other contenders were rejected on technical grounds.
Nishantha Ranatunga was re-elected unopposed as no one contested against him.
Tilanga Sumathipala, whose bid for chairmanship was rejected, said soon after voting ended that the AGM had failed to answer some of the pressing queries about cricket administration.
Sri Lanka Cricket, once the island's richest sporting bodies, is currently facing a liquidity crisis.
The losses incurred due to developing of two new stadiums to host the 2011 World Cup has left the SLC in red.