Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Runtime.Caching/System/Caching/CacheEntryRemovedReason.cs

@@ -0,0 +1,14 @@
+// <copyright file="CacheEntryRemovedReason.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+
+namespace System.Runtime.Caching {
+    public enum CacheEntryRemovedReason {
+        Removed = 0, //Explicitly removed via API call
+        Expired,     
+        Evicted,     //Evicted to free up space
+        ChangeMonitorChanged,  //An associated programmatic dependency triggered eviction
+        CacheSpecificEviction  //Catch-all for custom providers
+    }
+}