When “0” does not fetch any results.
When not “0” fetches the configured amount of results.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.nextresult(v=vs.100).aspx
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.nextresult(v=vs.100).aspx
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