diff --git a/src/Microsoft.AspNet.Mvc.Cors/CorsApplicationModelProvider.cs b/src/Microsoft.AspNet.Mvc.Cors/CorsApplicationModelProvider.cs
index f189c34964..fcc01bf89b 100644
--- a/src/Microsoft.AspNet.Mvc.Cors/CorsApplicationModelProvider.cs
+++ b/src/Microsoft.AspNet.Mvc.Cors/CorsApplicationModelProvider.cs
@@ -14,16 +14,6 @@ namespace Microsoft.AspNet.Mvc.Cors
 
         public void OnProvidersExecuted(ApplicationModelProviderContext context)
         {
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
             if (context == null)
             {
                 throw new ArgumentNullException(nameof(context));
@@ -38,16 +28,6 @@ namespace Microsoft.AspNet.Mvc.Cors
                 throw new ArgumentNullException(nameof(context));
             }
 
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
             IEnableCorsAttribute enableCors;
             IDisableCorsAttribute disableCors;
 
diff --git a/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilter.cs b/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilter.cs
index 038769d5ca..4eff4f2d18 100644
--- a/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilter.cs
+++ b/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilter.cs
@@ -56,16 +56,6 @@ namespace Microsoft.AspNet.Mvc.Cors
                 throw new ArgumentNullException(nameof(context));
             }
 
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
             // If this filter is not closest to the action, it is not applicable.
             if (!IsClosestToAction(context.Filters))
             {
diff --git a/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilterFactory.cs b/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilterFactory.cs
index 5ebf36ca81..f0f8c35f07 100644
--- a/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilterFactory.cs
+++ b/src/Microsoft.AspNet.Mvc.Cors/CorsAuthorizationFilterFactory.cs
@@ -41,16 +41,6 @@ namespace Microsoft.AspNet.Mvc.Cors
                 throw new ArgumentNullException(nameof(serviceProvider));
             }
 
-            if (serviceProvider == null)
-            {
-                throw new ArgumentNullException(nameof(serviceProvider));
-            }
-
-            if (serviceProvider == null)
-            {
-                throw new ArgumentNullException(nameof(serviceProvider));
-            }
-
             var filter = serviceProvider.GetRequiredService<CorsAuthorizationFilter>();
             filter.PolicyName = _policyName;
             return filter;
diff --git a/src/Microsoft.AspNet.Mvc.Cors/DisableCorsAuthorizationFilter.cs b/src/Microsoft.AspNet.Mvc.Cors/DisableCorsAuthorizationFilter.cs
index acc48cf837..8b494d5dfe 100644
--- a/src/Microsoft.AspNet.Mvc.Cors/DisableCorsAuthorizationFilter.cs
+++ b/src/Microsoft.AspNet.Mvc.Cors/DisableCorsAuthorizationFilter.cs
@@ -34,16 +34,6 @@ namespace Microsoft.AspNet.Mvc.Cors
                 throw new ArgumentNullException(nameof(context));
             }
 
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
-            if (context == null)
-            {
-                throw new ArgumentNullException(nameof(context));
-            }
-
             var accessControlRequestMethod =
                         context.HttpContext.Request.Headers[CorsConstants.AccessControlRequestMethod];
             if (string.Equals(