c# - Dispose the connection or Close the connection -


Which of the following two ways is better performance? 

  (var db_Connection_s = new DBC connection ()) {// todo: conversation with database connection}   
 or simply:  
  DB_Connection_s.Close ();   
 Finally.  
 What makes the concept of pooling unusable? Because if I settle the connection with each use, then I will have to open a new connection every time (and there will be no connection to the pool).   
 





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