Gets the date and time that the System.Net.ServicePoint object was last connected to a host.
A DateTime instance containing the date and time at which the System.Net.ServicePoint was last connected.
The ServicePoint.IdleSince property records the last date and time at which a service point was disconnected from a host. When the difference between the current time and ServicePoint.IdleSince exceeds the value of ServicePoint.MaxIdleTime, the System.Net.ServicePoint object is available for recycling to another connection.