diff --git a/Portable/UpdateControls.UnitTest/ContactListData/ContactList.cs b/Portable/UpdateControls.UnitTest/ContactListData/ContactList.cs
index 311f7a4..8f490ff 100644
--- a/Portable/UpdateControls.UnitTest/ContactListData/ContactList.cs
+++ b/Portable/UpdateControls.UnitTest/ContactListData/ContactList.cs
@@ -12,6 +12,11 @@ public void AddContact(Contact contact)
             _contacts.Add(contact);
         }
 
+        public void AddContacts(IEnumerable<Contact> contacts)
+        {
+            _contacts.AddRange(contacts);
+        }
+
         public void DeleteContact(Contact contact)
         {
             _contacts.Remove(contact);
diff --git a/Portable/UpdateControls/Collections/IndependentList.cs b/Portable/UpdateControls/Collections/IndependentList.cs
index 5970326..7053c1c 100644
--- a/Portable/UpdateControls/Collections/IndependentList.cs
+++ b/Portable/UpdateControls/Collections/IndependentList.cs
@@ -15,7 +15,7 @@ namespace UpdateControls.Collections
 {
 	public class IndependentList<T> : IList<T>
 	{
-        private IList<T> _list;
+        private List<T> _list;
 		private Independent _indList = new NamedIndependent(MemoizedTypeName<IndependentList<T>>.GenericName());
 
         public IndependentList()
@@ -66,6 +66,12 @@ public void Add(T item)
 			_list.Add(item);
 		}
 
+        public void AddRange(IEnumerable<T> items)
+        {
+            _indList.OnSet();
+            _list.AddRange(items);
+        }
+
 		public void Clear()
 		{
 			_indList.OnSet();
diff --git a/Universal/UpdateControls/Collections/IndependentList.cs b/Universal/UpdateControls/Collections/IndependentList.cs
index 2991f11..e9eee5b 100644
--- a/Universal/UpdateControls/Collections/IndependentList.cs
+++ b/Universal/UpdateControls/Collections/IndependentList.cs
@@ -15,7 +15,7 @@ namespace UpdateControls.Collections
 {
 	public class IndependentList<T> : IList<T>
 	{
-        private IList<T> _list;
+        private List<T> _list;
 		private Independent _indList = new Independent();
 
         public IndependentList()
@@ -60,11 +60,17 @@ public T this[int index]
 			}
 		}
 
-		public void Add(T item)
-		{
-			_indList.OnSet();
-			_list.Add(item);
-		}
+        public void Add(T item)
+        {
+            _indList.OnSet();
+            _list.Add(item);
+        }
+
+        public void AddRange(IEnumerable<T> items)
+        {
+            _indList.OnSet();
+            _list.AddRange(items);
+        }
 
 		public void Clear()
 		{
diff --git a/WindowsForms/UpdateControls/Collections/IndependentList.cs b/WindowsForms/UpdateControls/Collections/IndependentList.cs
index 5970326..89dc3ae 100644
--- a/WindowsForms/UpdateControls/Collections/IndependentList.cs
+++ b/WindowsForms/UpdateControls/Collections/IndependentList.cs
@@ -15,7 +15,7 @@ namespace UpdateControls.Collections
 {
 	public class IndependentList<T> : IList<T>
 	{
-        private IList<T> _list;
+        private List<T> _list;
 		private Independent _indList = new NamedIndependent(MemoizedTypeName<IndependentList<T>>.GenericName());
 
         public IndependentList()
@@ -60,11 +60,17 @@ public T this[int index]
 			}
 		}
 
-		public void Add(T item)
-		{
-			_indList.OnSet();
-			_list.Add(item);
-		}
+        public void Add(T item)
+        {
+            _indList.OnSet();
+            _list.Add(item);
+        }
+
+        public void AddRange(IEnumerable<T> items)
+        {
+            _indList.OnSet();
+            _list.AddRange(items);
+        }
 
 		public void Clear()
 		{