Using (sqlconnection conn = new sqlconnection)

So thatUsingThe main purpose here is to ensure thatConnectionVariable inUsingOther statement blocks will not be used. The second is to ensure thatSqlconnectionPut back into the buffer pool, these two are closely related. Using{} The syntax is clean and not easy to make mistakes. You never forget to write a statement to the above purpose. As for executing dispose, it is not the main purpose. It is just a syntax. If there are other ways to achieve these two goals, it is not necessary to postpone the execution of dispose.