question about open and close of MySqlConnection (no replies)

hi
i'd like to ask a question.

MySqlConnection connection = newMySqlConnection(stringConnection);
MySqlCommand cmd = connection.CreateCommand();
connection.Open();
and i have a try catch. accoding to your opinion, i should put connection.Close() in the block of try,or outside of block of try?
according to you,if i open the connection and do not close,is it bad?or i open 2 times(using different istancse,like connection1 and connecton2),is it ok?
thank u very much
best regards
martin