public EwsItem(
	string uniqueId
)

Public Sub New ( 
	uniqueId As String
)

You will usually use this constructor to build EwsItem objects and their collections which you can then pass to methods like DownloadItems(IEnumerableEwsItem, EwsItemParts). This is useful if you stored the list of item IDs somewhere (e.g. database) and later you need to restore it into a collection of EwsItem objects which you can pass to DownloadItems(IEnumerableEwsItem, EwsItemParts) method.