How do you deal with set back or disappointment at workplace?

TAKE A DEEP BREATH ....... GATHER YOURSELF & KEEP ON MOVING ,,,,  IT IS NOT YOUR HOME LAND , ITS WORK PLACE ,,,,,,, SO MOTIVATE YOURSELF FOR THE NEXT ASSIGNMENT AND MOVE ................ BEAT THE DISAPPOINTMENT  AND HARD PEOPLE WITH YOUR ACTIONS...................... NO WORDS ............................. GOOD LUCK SANCHIT

I would immediately get to the root of the problem and find out what went wrong at my end. Pointing fingers at others or simply accepting responsibility without offering solutions is inefficient and in fact, irresponsible. After contemplating the situation I would identify a suitable course of action to rectify the problem.

"If at first you don't succeed, dust yourself off and try again"    --Aliyah. 

The company will never accept your emotions. You need to be strong and use dialogues.

try to think of the positive things and you find yourself getting a solution.

agree With All Colleagues answer