diff --git a/src/GlobalSuppressions.cs b/src/GlobalSuppressions.cs
index e9653745..8a50d39d 100644
--- a/src/GlobalSuppressions.cs
+++ b/src/GlobalSuppressions.cs
@@ -175,7 +175,7 @@
 #endregion
 
 #region CA2000 Dispose objects
-[assembly: SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Scope = "member", Target = "Microsoft.Restier.Publishers.OData.RestierController.#CreateQueryResponse(System.Linq.IQueryable,Microsoft.OData.Edm.IEdmType,System.Boolean,System.Web.OData.Formatter.ETag)")]
+[assembly: SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Scope = "member", Target = "Microsoft.Restier.Publishers.OData.RestierController.#CreateQueryResponse(System.Linq.IQueryable,Microsoft.OData.Edm.IEdmType,System.Web.OData.Formatter.ETag)")]
 [assembly: SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Scope = "member", Target = "Microsoft.Restier.Publishers.OData.RestierExceptionFilterAttribute.#HandleCommonException(System.Web.Http.Filters.HttpActionExecutedContext,System.Boolean,System.Threading.CancellationToken)")]
 #endregion
 
diff --git a/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/DeserializationHelpers.cs b/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/DeserializationHelpers.cs
index 2d912dbc..acb1c2eb 100644
--- a/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/DeserializationHelpers.cs
+++ b/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/DeserializationHelpers.cs
@@ -33,16 +33,6 @@ internal static object ConvertValue(
                 Request = request
             };
 
-            // Enum logic can be removed after RestierEnumDeserializer extends ODataEnumDeserializer
-            var deserializerProvider = serviceProvider.GetService<ODataDeserializerProvider>();
-            var enumValue = odataValue as ODataEnumValue;
-            if (enumValue != null)
-            {
-                ODataEdmTypeDeserializer deserializer
-                    = deserializerProvider.GetEdmTypeDeserializer(propertyType.AsEnum());
-                return deserializer.ReadInline(enumValue, propertyType, readContext);
-            }
-
             var returnValue = ODataModelBinderConverter.Convert(
                 odataValue, propertyType, expectedReturnType, parameterName, readContext, serviceProvider);
 
diff --git a/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/RestierEnumDeserializer.cs b/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/RestierEnumDeserializer.cs
index b5786406..92713960 100644
--- a/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/RestierEnumDeserializer.cs
+++ b/src/Microsoft.Restier.Publishers.OData/Formatter/Deserialization/RestierEnumDeserializer.cs
@@ -12,15 +12,10 @@ namespace Microsoft.Restier.Publishers.OData.Formatter
     /// <summary>
     /// The serializer for enum result.
     /// </summary>
-    internal class RestierEnumDeserializer : ODataEdmTypeDeserializer
+    internal class RestierEnumDeserializer : ODataEnumDeserializer
     {
         private ODataEnumDeserializer enumDeserializer = new ODataEnumDeserializer();
 
-        public RestierEnumDeserializer()
-            : base(ODataPayloadKind.Property)
-        {
-        }
-
         /// <inheritdoc />
         public override object Read(
             ODataMessageReader messageReader,
diff --git a/src/Microsoft.Restier.Publishers.OData/RestierController.cs b/src/Microsoft.Restier.Publishers.OData/RestierController.cs
index 3805de69..0a3c5cb7 100644
--- a/src/Microsoft.Restier.Publishers.OData/RestierController.cs
+++ b/src/Microsoft.Restier.Publishers.OData/RestierController.cs
@@ -86,9 +86,6 @@ public async Task<HttpResponseMessage> Get(
             IQueryable queryable = this.GetQuery(path);
             ETag etag;
 
-            // TODO This flag can be removed when Etag isIfNoneMatch is changed to public.
-            bool isIfNoneMatch;
-
             // TODO #365 Do not support additional path segment after function call now
             if (lastSegment is OperationImportSegment)
             {
@@ -97,7 +94,7 @@ public async Task<HttpResponseMessage> Get(
                 Func<string, object> getParaValueFunc = p => unboundSegment.GetParameterValue(p);
                 result = await ExecuteOperationAsync(
                     getParaValueFunc, operation.Name, true, null, cancellationToken);
-                result = ApplyQueryOptions(result, path, true, out isIfNoneMatch, out etag);
+                result = ApplyQueryOptions(result, path, true, out etag);
             }
             else
             {
@@ -119,16 +116,16 @@ public async Task<HttpResponseMessage> Get(
                     result = await ExecuteOperationAsync(
                         getParaValueFunc, operation.Name, true, result, cancellationToken);
 
-                    result = ApplyQueryOptions(result, path, true, out isIfNoneMatch, out etag);
+                    result = ApplyQueryOptions(result, path, true, out etag);
                 }
                 else
                 {
-                    queryable = ApplyQueryOptions(queryable, path, false, out isIfNoneMatch, out etag);
+                    queryable = ApplyQueryOptions(queryable, path, false, out etag);
                     result = await ExecuteQuery(queryable, cancellationToken);
                 }
             }
 
-            return this.CreateQueryResponse(result, path.EdmType, isIfNoneMatch, etag);
+            return this.CreateQueryResponse(result, path.EdmType, etag);
         }
 
         /// <summary>
@@ -330,7 +327,7 @@ public async Task<HttpResponseMessage> PostAction(
                 return this.Request.CreateResponse(HttpStatusCode.NoContent);
             }
 
-            return this.CreateQueryResponse(result, path.EdmType, false, null);
+            return this.CreateQueryResponse(result, path.EdmType, null);
         }
 
         private static IEdmTypeReference GetTypeReference(IEdmType edmType)
@@ -418,7 +415,7 @@ private async Task<IHttpActionResult> Update(
         }
 
         private HttpResponseMessage CreateQueryResponse(
-            IQueryable query, IEdmType edmType, bool isIfNoneMatch, ETag etag)
+            IQueryable query, IEdmType edmType, ETag etag)
         {
             IEdmTypeReference typeReference = GetTypeReference(edmType);
             BaseSingleResult singleResult = null;
@@ -504,7 +501,7 @@ private HttpResponseMessage CreateQueryResponse(
                 etag.EntityType = query.ElementType;
                 query = etag.ApplyTo(query);
                 entityResult = query.SingleOrDefault();
-                if (entityResult == null && !isIfNoneMatch)
+                if (entityResult == null && !etag.IsIfNoneMatch)
                 {
                     return this.Request.CreateResponse(HttpStatusCode.PreconditionFailed);
                 }
@@ -537,10 +534,8 @@ private IQueryable GetQuery(ODataPath path)
         }
 
         private IQueryable ApplyQueryOptions(
-            IQueryable queryable, ODataPath path, bool applyCount, out bool isIfNoneMatch, out ETag etag)
+            IQueryable queryable, ODataPath path, bool applyCount, out ETag etag)
         {
-            // ETAG IsIfNoneMatch is changed to public access, this flag can be removed.
-            isIfNoneMatch = false;
             etag = null;
 
             if (this.shouldWriteRawValue)
@@ -562,7 +557,6 @@ private IQueryable ApplyQueryOptions(
             }
             else if (queryOptions.IfNoneMatch != null)
             {
-                isIfNoneMatch = true;
                 etag = queryOptions.IfNoneMatch;
             }
 
diff --git a/test/ODataEndToEnd/Microsoft.OData.Service.Sample.Northwind.Tests/OperationTests.cs b/test/ODataEndToEnd/Microsoft.OData.Service.Sample.Northwind.Tests/OperationTests.cs
index d3ae88d8..6c15051e 100644
--- a/test/ODataEndToEnd/Microsoft.OData.Service.Sample.Northwind.Tests/OperationTests.cs
+++ b/test/ODataEndToEnd/Microsoft.OData.Service.Sample.Northwind.Tests/OperationTests.cs
@@ -5,9 +5,7 @@
 using System.Text;
 using System.Threading.Tasks;
 using System.Web.Http;
-using System.Web.OData.Extensions;
 using Microsoft.OData.Service.Sample.Northwind.Models;
-using Microsoft.OData.UriParser;
 using Microsoft.Restier.Tests;
 using Xunit;