diff --git a/ecs-object-client-dotnet-test/ECSSDK.Test.ObjectTest.cs b/ecs-object-client-dotnet-test/ECSSDK.Test.ObjectTest.cs
index 1d9acf4..abb7336 100644
--- a/ecs-object-client-dotnet-test/ECSSDK.Test.ObjectTest.cs
+++ b/ecs-object-client-dotnet-test/ECSSDK.Test.ObjectTest.cs
@@ -420,5 +420,30 @@ public void TestStandardAwsStuff()
             });
 
         }
+
+        [TestMethod]
+        public void TestObjectWithMetadata()
+        {
+            string key = "meta-1";
+            string content = "sample object data content ...";
+
+            PutObjectRequest por = new PutObjectRequest()
+            {
+                BucketName = temp_bucket,
+                Key = key,
+                ContentBody = content,
+            };
+
+            por.Metadata.Add("555", "55555");
+            por.Metadata.Add("bbb", "bbbbb");
+            por.Metadata.Add("b_b_b", "bubub");
+            por.Metadata.Add("aaa", "aaaaa");
+            por.Metadata.Add("a_a_a", "auaua");
+            por.Metadata.Add("111", "11111");
+
+            PutObjectResponse response = client.PutObject(por);
+            Assert.AreEqual(response.HttpStatusCode, System.Net.HttpStatusCode.OK);
+
+        }
     }
 }
diff --git a/ecs-object-client-dotnet/Internal/S3SignerECS.cs b/ecs-object-client-dotnet/Internal/S3SignerECS.cs
index 1ca5142..139253c 100644
--- a/ecs-object-client-dotnet/Internal/S3SignerECS.cs
+++ b/ecs-object-client-dotnet/Internal/S3SignerECS.cs
@@ -125,7 +125,7 @@ static string BuildStringToSign(IRequest request)
         static string BuildCanonicalizedHeaders(IDictionary<string, string> headers)
         {
             var sb = new StringBuilder(256);
-            foreach (var key in headers.Keys.OrderBy(x => x, StringComparer.OrdinalIgnoreCase))
+            foreach (var key in headers.Keys.OrderBy(x => x, StringComparer.InvariantCultureIgnoreCase))
             {
                 var lowerKey = key.ToLowerInvariant();
                 if (!lowerKey.StartsWith("x-amz-", StringComparison.Ordinal) && 
diff --git a/ecs-object-client-dotnet/Properties/AssemblyInfo.cs b/ecs-object-client-dotnet/Properties/AssemblyInfo.cs
index ceda850..4555cec 100644
--- a/ecs-object-client-dotnet/Properties/AssemblyInfo.cs
+++ b/ecs-object-client-dotnet/Properties/AssemblyInfo.cs
@@ -47,5 +47,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion("1.0.1.0")]
+[assembly: AssemblyFileVersion("1.0.1.0")]