diff --git a/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.netcore.cs b/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.netcore.cs
index b1bb4065c8..28b159c5e7 100644
--- a/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.netcore.cs
+++ b/src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.netcore.cs
@@ -262,38 +262,6 @@ internal void StartSession(object cancellationOwner)
             _cancellationOwner.Target = cancellationOwner;
         }
 
-        /// <summary>
-        /// Checks to see if the underlying connection is still valid (used by idle connection resiliency - for active connections)
-        /// NOTE: This is not safe to do on a connection that is currently in use
-        /// NOTE: This will mark the connection as broken if it is found to be dead
-        /// </summary>
-        /// <returns>True if the connection is still alive, otherwise false</returns>
-        internal bool ValidateSNIConnection()
-        {
-            if ((_parser == null) || ((_parser.State == TdsParserState.Broken) || (_parser.State == TdsParserState.Closed)))
-            {
-                return false;
-            }
-
-            if (DateTime.UtcNow.Ticks - _lastSuccessfulIOTimer._value <= CheckConnectionWindow)
-            {
-                return true;
-            }
-
-            uint error = TdsEnums.SNI_SUCCESS;
-            SniContext = SniContext.Snix_Connect;
-            try
-            {
-                Interlocked.Increment(ref _readingCount);
-                error = CheckConnection();
-            }
-            finally
-            {
-                Interlocked.Decrement(ref _readingCount);
-            }
-            return (error == TdsEnums.SNI_SUCCESS) || (error == TdsEnums.SNI_WAIT_TIMEOUT);
-        }
-
         // This method should only be called by ReadSni!  If not - it may have problems with timeouts!
         private void ReadSniError(TdsParserStateObject stateObj, uint error)
         {
diff --git a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParserStateObject.netfx.cs b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParserStateObject.netfx.cs
index 5d4a332665..e7e1ac9453 100644
--- a/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParserStateObject.netfx.cs
+++ b/src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParserStateObject.netfx.cs
@@ -293,7 +293,12 @@ internal PacketHandle ReadAsync(SessionHandle handle, out uint error)
             return readPacket;
         }
 
-        internal uint CheckConnection() => SNINativeMethodWrapper.SNICheckConnection(Handle);
+        /// <remarks>
+        /// Note <see cref="Handle"/> is not supposed to be null when this method is called and the native implementation doesn't expect null values here.
+        /// The handle will not be null unless this <see cref="TdsParserStateObject"/> instance has been disposed.
+        /// We could probably throw an exception instead of returning success (like managed netcore version does).
+        /// </remarks>
+        internal uint CheckConnection() => Handle == null ? TdsEnums.SNI_SUCCESS : SNINativeMethodWrapper.SNICheckConnection(Handle);
 
         internal void ReleasePacket(PacketHandle syncReadPacket) => SNINativeMethodWrapper.SNIPacketRelease(syncReadPacket);
         
@@ -387,42 +392,6 @@ internal void StartSession(int objectID)
             _allowObjectID = objectID;
         }
 
-        /// <summary>
-        /// Checks to see if the underlying connection is still valid (used by idle connection resiliency - for active connections)
-        /// NOTE: This is not safe to do on a connection that is currently in use
-        /// NOTE: This will mark the connection as broken if it is found to be dead
-        /// </summary>
-        /// <returns>True if the connection is still alive, otherwise false</returns>
-        internal bool ValidateSNIConnection()
-        {
-            if ((_parser == null) || ((_parser.State == TdsParserState.Broken) || (_parser.State == TdsParserState.Closed)))
-            {
-                return false;
-            }
-
-            if (DateTime.UtcNow.Ticks - _lastSuccessfulIOTimer._value <= CheckConnectionWindow)
-            {
-                return true;
-            }
-
-            uint error = TdsEnums.SNI_SUCCESS;
-            SniContext = SniContext.Snix_Connect;
-            try
-            {
-                Interlocked.Increment(ref _readingCount);
-                SNIHandle handle = Handle;
-                if (handle != null)
-                {
-                    error = SNINativeMethodWrapper.SNICheckConnection(handle);
-                }
-            }
-            finally
-            {
-                Interlocked.Decrement(ref _readingCount);
-            }
-            return (error == TdsEnums.SNI_SUCCESS) || (error == TdsEnums.SNI_WAIT_TIMEOUT);
-        }
-
         // This method should only be called by ReadSni!  If not - it may have problems with timeouts!
         private void ReadSniError(TdsParserStateObject stateObj, uint error)
         {
diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
index 17729a4cc9..2d7bfed3a9 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
@@ -2477,6 +2477,37 @@ internal bool IsConnectionAlive(bool throwOnException)
             return isAlive;
         }
 
+        /// <summary>
+        /// Checks to see if the underlying connection is still valid (used by idle connection resiliency - for active connections)
+        /// NOTE: This is not safe to do on a connection that is currently in use
+        /// NOTE: This will mark the connection as broken if it is found to be dead
+        /// </summary>
+        /// <returns>True if the connection is still alive, otherwise false</returns>
+        internal bool ValidateSNIConnection()
+        {
+            if ((_parser == null) || ((_parser.State == TdsParserState.Broken) || (_parser.State == TdsParserState.Closed)))
+            {
+                return false;
+            }
+
+            if (DateTime.UtcNow.Ticks - _lastSuccessfulIOTimer._value <= CheckConnectionWindow)
+            {
+                return true;
+            }
+
+            SniContext = SniContext.Snix_Connect;
+            try
+            {
+                Interlocked.Increment(ref _readingCount);
+                uint error = CheckConnection();
+                return (error == TdsEnums.SNI_SUCCESS) || (error == TdsEnums.SNI_WAIT_TIMEOUT);
+            }
+            finally
+            {
+                Interlocked.Decrement(ref _readingCount);
+            }
+        }
+
         /*
 
         // leave this in. comes handy if you have to do Console.WriteLine style debugging ;)