Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data/System/Data/OleDb/OleDbReferenceCollection.cs

@@ -0,0 +1,47 @@
+//------------------------------------------------------------------------------
+// <copyright file="OleDbReferenceCollection.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.OleDb {
+
+    using System;
+    using System.Data;
+    using System.Data.Common;
+    using System.Data.ProviderBase;
+    using System.Diagnostics;
+    using System.Runtime.InteropServices;
+
+    sealed internal class OleDbReferenceCollection : DbReferenceCollection {
+        internal const int Closing = 0;
+        internal const int Canceling = -1;
+
+        internal const int CommandTag = 1;
+        internal const int DataReaderTag = 2;
+
+        override public void Add(object value, int tag) {
+            base.AddItem(value, tag);
+        }
+
+        override protected void NotifyItem(int message, int tag, object value) {
+            bool canceling = (Canceling == message);
+            if (CommandTag == tag) {
+                ((OleDbCommand) value).CloseCommandFromConnection(canceling);
+            }
+            else if (DataReaderTag == tag) {
+                ((OleDbDataReader) value).CloseReaderFromConnection(canceling);
+            }
+            else {
+                Debug.Assert(false, "shouldn't be here");
+            }
+        }
+
+        override public void Remove(object value) {
+            base.RemoveItem(value);
+        }
+
+    }
+}