Mario,a Professional Entertainer,entered into a One-Year Contract with Barnum to Perform

True/False

Mario,a professional entertainer,entered into a one-year contract with Barnum to perform exclusively at Barnum's theatre,and to perform nowhere else during that period of time.A week after the agreement was signed,Mario entered into another agreement with a competitor of Barnum to perform at his opera house.
-Barnum is entitled to treat Mario's actions as a breach of his contract.