Question

how to develop sportsmanship?

Answer 1

stay positive 
play fair
be a team player 
cooperate with others
loose gracefully
respect the rules and officials 
be disciplined 
have self confidence
help others

following all these we can develop good sportsmanship as a player

Answer 2

Play fair.
Sounds simple, but you'd be surprised how many men will cheat or play dirty to win.
Be a team player.
Stay positive.
Keep trash talk to a minimum.
Lose gracefully.
Win with class.
Respect the rulings of officials.
Watch your alcohol intake.