遇到这种错误信息, 一般是自己忘记了关闭SqlConnection所致, 也叫SQL Connection Leak.遇到这种错误信息, 一般是自己忘记了关闭SqlConnection所致, 也叫SQL Conn
阅读背景：
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
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