Pings the server to test the network and response speed of database.
<co type="warning" inline="true">
	This method may needs some privilege according to the database product and its version.
</co>


<st>Examples</st>

Following section demonstrates ping and calculate average time.
<sample>
	<pre lang="c#">
        using(var exc = cn.Executer()) 
        {
			var ping = exc.PingServer();

			Console.WriteLine("Ping = " + ping.TotalMilliseconds.ToString() + "ms.");
        }
	</pre>
	<output>
		Ping = 0ms.
	</output>
	<fiddle>jJ0DZ7</fiddle>
</sample>