verbs - What is the difference between "doing something" and "on doing something"?


I don't understand the difference between "doing something" and "on doing something". I am going to make up a few examples.


(1) On cleaning up my bedroom, I found my valuable watch.


(2) Cleaning up my bedroom, I found my valuable watch.


Do these sentences have the same meaning? Please explain it. Thank you very much.




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