Gets or sets a value indicating whether the collection has been marked as changed.
Assembly: System.Web (in System.Web.dll)
The property is used to indicate whether the contents of the SessionStateItemCollection collection have changed.
The property is set to true when an object value is set or added to the collection using the Item property and when one or more object values are removed from the collection using the Remove, RemoveAt, or Clear methods.
The property is also set to true when a mutable object is retrieved from the collection using the Item property.