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Vb.net to sql Server connection

Posted on 2012-03-16
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I have a winForms application that is doing tons of reads/writes to a database on hundreds of installed clients.    My question is ->  Is it better to open a connection to the server and keep it open during the session (hours - sometimes days).

(One issue here is that if computer goes to sleep after inactivity SQL will drop the SSID.)

OR

is it beneficial to Open/Close connection on every read/write.   This would be cause some additional overhead.  But, would always ensure that a new connection is established (if server is available).

What is your experience?
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Question by:browe68
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PaulHews earned 500 total points
ID: 37731087
If you keep it open, you are frustrating the server's ability to manage the connection pool.

SQL Server Connection Pooling (ADO.NET)
http://msdn.microsoft.com/en-us/library/8xx3tyca.aspx

Note the following from the above link:
We strongly recommend that you always close the connection when you are finished using it so that the connection will be returned to the pool. You can do this using either the Close or Dispose methods of the Connection object, or by opening all connections inside a using statement in C#, or a Using statement in Visual Basic. Connections that are not explicitly closed might not be added or returned to the pool. For more information, see using Statement (C# Reference) or How to: Dispose of a System Resource (Visual Basic) for Visual Basic.

Generally it is recommended that you do not keep a connection open longer than needed.
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by:browe68
ID: 37731146
Thanks!
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