as long as you are strict about disposing your connections, the default (for sql-server at least) is that it will just work automatically. In your example you could well only have 3 underlying connections (one per connection string).
But always ensure your connections are disposed, ideally with using
:
using(var conn = new SqlConnection(connectionString)) {
// use conn
}
then it is released back to the pool (for re-use when the same connection-string is seen next) even when an exception is thrown.
To disable pooling (if you choose), include Pooling=false;
in the connection-string.
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