diff --git a/ExamplesAndTests/Swordfish.NET.UnitTestV3/ConcurrentObservableDictionary_Issue35.cs b/ExamplesAndTests/Swordfish.NET.UnitTestV3/ConcurrentObservableDictionary_Issue35.cs
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index 0000000..268e8db
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+++ b/ExamplesAndTests/Swordfish.NET.UnitTestV3/ConcurrentObservableDictionary_Issue35.cs
@@ -0,0 +1,89 @@
+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Swordfish.NET.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+
+namespace Swordfish.NET.UnitTestV3
+{
+    /// <summary>
+    /// This is a group of tests for Issue 35 on github
+    /// https://github.com/stewienj/SwordfishCollections/issues/35
+    /// </summary>
+    [TestClass]
+    public class ConcurrentObservableDictionary_Issue35
+    {
+        [TestMethod]
+        public void AddRangeRemoveRangeTest()
+        {
+            var keyValuePairs = Enumerable.Range(0, 10)
+                .Select(i => new KeyValuePair<object, int>(new object(), i)).ToArray();
+
+            var testCollection = new ConcurrentObservableDictionary<object, int>();
+            testCollection.AddRange(keyValuePairs);
+            testCollection.Should().BeEquivalentTo(keyValuePairs);
+            testCollection.RemoveRange(keyValuePairs.Take(5).Select(pair => pair.Key));
+            testCollection.Count.Should().Be(5);
+            testCollection.Should().BeEquivalentTo(keyValuePairs.Skip(5));
+        }
+
+        [TestMethod]
+        public void AddRangeRemoveTest()
+        {
+            var keyValuePairs = Enumerable.Range(0, 10)
+                .Select(i => new KeyValuePair<object, int>(new object(), i)).ToArray();
+
+            var testCollection = new ConcurrentObservableDictionary<object, int>();
+            testCollection.AddRange(keyValuePairs);
+            testCollection.Should().BeEquivalentTo(keyValuePairs);
+            foreach (var key in keyValuePairs.Take(5).Select(pair => pair.Key))
+            {
+                testCollection.Remove(key);
+            }
+            testCollection.Count.Should().Be(5);
+            testCollection.Should().BeEquivalentTo(keyValuePairs.Skip(5));
+        }
+
+        [TestMethod]
+        public void AddRemoveRangeTest()
+        {
+            var keyValuePairs = Enumerable.Range(0, 10)
+                .Select(i => new KeyValuePair<object, int>(new object(), i)).ToArray();
+
+            var testCollection = new ConcurrentObservableDictionary<object, int>();
+            foreach (var pair in keyValuePairs)
+            {
+                testCollection.Add(pair.Key, pair.Value);
+            }
+            testCollection.Should().BeEquivalentTo(keyValuePairs);
+            testCollection.RemoveRange(keyValuePairs.Take(5).Select(pair => pair.Key));
+            testCollection.Count.Should().Be(5);
+            testCollection.Should().BeEquivalentTo(keyValuePairs.Skip(5));
+        }
+
+        [TestMethod]
+        public void AddRemoveTest()
+        {
+            var keyValuePairs = Enumerable.Range(0, 10)
+                .Select(i => new KeyValuePair<object, int>(new object(), i)).ToArray();
+
+            var testCollection = new ConcurrentObservableDictionary<object, int>();
+            foreach (var pair in keyValuePairs)
+            {
+                testCollection.Add(pair.Key, pair.Value);
+            }
+            testCollection.Should().BeEquivalentTo(keyValuePairs);
+            foreach (var key in keyValuePairs.Take(5).Select(pair => pair.Key))
+            {
+                testCollection.Remove(key);
+            }
+            testCollection.Count.Should().Be(5);
+            testCollection.Should().BeEquivalentTo(keyValuePairs.Skip(5));
+        }
+
+
+
+
+    }
+}