This interface implements a method for comparing objects. Compare( ) determines whether an object is greater than (positive return value), less than (negative return value), or equal (zero) to another object. This interface is required for classes that need to sort elements or search collections. public interface IComparer { // Public Instance Methods public int Compare (object x , object y ); } Implemented ByCaseInsensitiveComparer , Comparer Returned ByHashtable.comparer Passed ToSystem.Array.{BinarySearch( ) , Sort( )} , ArrayList.{BinarySearch( ) , Sort( )} , Hashtable.{comparer , Hashtable( )} , SortedList.SortedList( ) , System.Collections.Specialized.ListDictionary.ListDictionary( ) , System.Collections.Specialized.NameObjectCollectionBase.NameObjectCollectionBase( ) , System.Collections.Specialized.NameValueCollection.NameValueCollection( ) , System.Xml.XPath.XPathExpression.AddSort( ) |