What is Maximum Pool Size in ADO.NET Connection String?
Maximum pool size decides the maximum number of connection objects to
be pooled. If the maximum pool size is reached and there is no usable
connection available the request is queued until connections are
released back in to pool. So it's always a good habit to either call
the close or dispose method of the connection as soon as you have
finished work with the connection object.

How to enable and disable connection pooling?
For .NET it's enabled by default but if you want to just make sure
set Pooling=true in the connection string. To disable connection
pooling set Pooling=false in connection string if it's a ADO.NET
Connection. If it's an OLEDBConnection object set OLE DB Services=-4
in the connection string.

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