Conversation so far:
What happened to Dominik Hašek in 2005?
Dominik Hašek earned his 300th National Hockey League win on October 15, 2005, in a 5–1 home victory with the Ottawa Senators over the Boston Bruins.
What was the 1994–95 NHL lockout?
The 1994–95 NHL lockout was a lockout that came after a year of National Hockey League hockey that was played without a collective bargaining agreement.
What else did Dominik Hašek do?
In 1998 Dominik Hašek won his second consecutive Hart Memorial Trophy, becoming the first goaltender to win the award multiple times.

Question: When did he join the Ottawa senators?
Self-contained rewrite: When did Dominik Hašek join the Ottawa senators?