正确处理共享主机上的连接池问题

Question

I know that there is a similar question like this on Stack Overflow, but it doesn't quite fit what I have tried. I believe the reason for this problem is different, although the end-result is the same.

Whenever my site has been running for about two or three days, I get the following error (which is obviously caused by either connections/queries hanging, or not being disposed properly).

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.

At first, I did some investigation and realized that using using , using a finalize call and other solutions weren't enough. The error would still eventually occur.

So I decided to figure out wether or not the Server Explorer (which I use often) in Visual Studio leaks connections. I had already changed the maximum execution and connection timeout to 3 seconds, and had reduced the pool size to 10 connections, so the Server Explorer could be the cause. No luck!

So what do I try now?

Answer 1

Here's the code I solved the problem with. When connecting, catch the exception and clear all pools, and then try again.

_connection =
    new SqlConnection(connectionString);
try
{
    _connection.Open();
}
catch (InvalidOperationException)
{
    SqlConnection.ClearAllPools();
    _connection.Open();
}

Also, when disposing the connection, make sure to clear the pools.

if (_connection != null)
{
    SqlConnection.ClearAllPools();
    _connection.Close();
    _connection.Dispose();
}