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The ISessionStateItemCollection.Dirty property is used by the System.Web.SessionState.SessionStateModule to determine whether the values in an System.Web.SessionState.ISessionStateItemCollection implementation have been modified.
In implementing the System.Web.SessionState.ISessionStateItemCollection interface, you should initialize the ISessionStateItemCollection.Dirty property as false and set the SessionStateItemCollection.Dirty property to true in the implementations of the ISessionStateItemCollection.Remove(string), ISessionStateItemCollection.RemoveAt(int), or ISessionStateItemCollection.Clear methods.