Remove uncalled BestEffortCleanup methods

This allows TdsParser.netfx.cs to be deleted

Author: edwardneal

src/Microsoft.Data.SqlClient/netfx/src/Microsoft.Data.SqlClient.csproj

@@ -927,7 +927,6 @@
     <Compile Include="Microsoft\Data\SqlClient\SqlConnectionHelper.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlInternalConnectionTds.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\TdsParser.netfx.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParserStateObject.netfx.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParserStateObjectNative.cs" />
   </ItemGroup>

src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.netfx.cs

@@ -1377,11 +1377,8 @@ private void RunParserReliably(BulkCopySimpleResultSet bulkCopyHandler = null)
             internalConnection.ThreadHasParserLockForClose = true;
             try
             {
-                #if NETFRAMEWORK
-                _parser.RunReliably(RunBehavior.UntilDone, null, null, bulkCopyHandler, _stateObj);                
-                #else
-                _parser.Run(RunBehavior.UntilDone, null, null, bulkCopyHandler, _stateObj);
-                #endif
+                // @TODO: CER Exception Handling was removed here (see GH#3581)
+                _parser.Run(RunBehavior.UntilDone, null, null, bulkCopyHandler, _stateObj);                
             }
             finally
             {

src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlBulkCopy.cs

@@ -215,24 +215,6 @@ internal string TraceString()
                         _cachedCount,
                         _cache.Count);
         }
-
-#if NETFRAMEWORK
-        internal void BestEffortCleanup()
-        {
-            for (int i = 0; i < _cache.Count; i++)
-            {
-                TdsParserStateObject session = _cache[i];
-                if (session != null)
-                {
-                    SNIHandle sessionHandle = session.Handle;
-                    if (sessionHandle != null)
-                    {
-                        sessionHandle.Dispose();
-                    }
-                }
-            }
-        }
-#endif
     }
 }