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Ok.. so here is my situation

1) I have multiple connections open the DB at any time.
2) each connection only uses one datareader - and that datareader is always closed when im done.
3) I use connection pooling - and allow up to 250 connections to be pooled.

whenever i need a new connection - i essentially grab it from the pool.

so this means that there will be many connections at any time - but each connection uses at most 1 reader at any time, and always closes the reader.. There may be several readers open - each on it's own connection at any time.

So - why then - do I get the "commands out of sync" exception?

aren't I following all of the rules?

when i get a connection from the pool - it should give me one that doesn't have any open datareaders on it, right? and one that i already closed as well, right?

am i missing something?

Do you use Unicode in your application? What kind of queries do you use (stored procedures call, select from table)?

Serious wrote:Do you use Unicode in your application? What kind of queries do you use (stored procedures call, select from table)?

No unicode at all.

And no stored procedures - only selects from table.

Jon

If you use prepared commands make sure you call MySqlCommand.Dispose() before connection closing.