diff --git a/FlatFiles/DataRecordExtensions.cs b/FlatFiles/DataRecordExtensions.cs
index 38d8748..e324705 100644
--- a/FlatFiles/DataRecordExtensions.cs
+++ b/FlatFiles/DataRecordExtensions.cs
@@ -1,5 +1,4 @@
-#if NET451 || NETSTANDARD2_0 || NETCOREAPP
-using System;
+using System;
 using System.Data;
 using System.Reflection;
 
@@ -1087,4 +1086,3 @@ private static T Get<T>(IDataRecord record, string name, Func<int, T> getter)
         }
     }
 }
-#endif
\ No newline at end of file
diff --git a/FlatFiles/DataTableExtensions.cs b/FlatFiles/DataTableExtensions.cs
index e0b33dc..0da0447 100644
--- a/FlatFiles/DataTableExtensions.cs
+++ b/FlatFiles/DataTableExtensions.cs
@@ -1,5 +1,3 @@
-#if NET451 || NETSTANDARD2_0 || NETCOREAPP
-
 using System;
 using System.Data;
 using System.Linq;
@@ -72,5 +70,3 @@ public static void WriteFlatFile(this DataTable table, IWriter writer)
         }
     }
 }
-
-#endif
\ No newline at end of file
diff --git a/FlatFiles/FlatFileDataReader.cs b/FlatFiles/FlatFileDataReader.cs
index 41642e0..87be082 100644
--- a/FlatFiles/FlatFileDataReader.cs
+++ b/FlatFiles/FlatFileDataReader.cs
@@ -1,5 +1,4 @@
-#if NET451 || NETSTANDARD2_0 || NETCOREAPP
-
+
 using System;
 using System.Data;
 using System.Data.Common;
@@ -230,11 +229,7 @@ public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, i
         {
             var values = GetValues();
             var bytes = (byte[])values[i];
-#if NET451
             Array.Copy(bytes, fieldOffset, buffer, bufferoffset, length);
-#else
-            Array.Copy(bytes, (int)fieldOffset, buffer, bufferoffset, length);
-#endif
             return Math.Min(bytes.Length - fieldOffset, length);
         }
 
@@ -266,11 +261,7 @@ public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, i
             }
             var values = GetValues();
             var chars = (char[])values[i];
-#if NET451
             Array.Copy(buffer, fieldoffset, buffer, bufferoffset, length);
-#else
-            Array.Copy(buffer, (int)fieldoffset, buffer, bufferoffset, length);
-#endif
             return Math.Min(chars.Length - fieldoffset, length);
         }
 
@@ -611,5 +602,3 @@ private ColumnCollection GetColumns(ISchema schema)
         }
     }
 }
-
-#endif
diff --git a/FlatFiles/FlatFileDataReaderOptions.cs b/FlatFiles/FlatFileDataReaderOptions.cs
index 1863bc3..58353f3 100644
--- a/FlatFiles/FlatFileDataReaderOptions.cs
+++ b/FlatFiles/FlatFileDataReaderOptions.cs
@@ -1,5 +1,3 @@
-#if NET451 || NETSTANDARD2_0 || NETCOREAPP
-
 using System;
 
 namespace FlatFiles
@@ -28,5 +26,3 @@ public FlatFileDataReaderOptions()
         public bool IsNullStringAllowed { get; set; }
     }
 }
-
-#endif
\ No newline at end of file
diff --git a/FlatFiles/FlatFiles.csproj b/FlatFiles/FlatFiles.csproj
index b11be6b..a655110 100644
--- a/FlatFiles/FlatFiles.csproj
+++ b/FlatFiles/FlatFiles.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp3.0;netstandard2.1;netstandard2.0;netstandard1.6;net451</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;netstandard2.1</TargetFrameworks>
     <NeutralLanguage>en-US</NeutralLanguage>
     <Description>Reads and writes CSV, fixed-length and other flat file formats with a focus on schema definition, configuration and speed. Supports mapping directly between files and classes.</Description>
     <Copyright>Copyright @ 2021</Copyright>
@@ -26,14 +26,14 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netstandard1.6|AnyCPU'">
-    <DocumentationFile>bin\Debug\netstandard1.6\FlatFiles.xml</DocumentationFile>
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net462|AnyCPU'">
+    <DocumentationFile>bin\Debug\net462\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netstandard1.6|AnyCPU'">
-    <DocumentationFile>bin\Release\netstandard1.6\FlatFiles.xml</DocumentationFile>
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net462|AnyCPU'">
+    <DocumentationFile>bin\Release\net462\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
-  
+
   <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netstandard2.0|AnyCPU'">
     <DocumentationFile>bin\Debug\netstandard2.0\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
@@ -42,24 +42,12 @@
     <DocumentationFile>bin\Release\netstandard2.0\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netstandard2.1|AnyCPU'">
-    <DocumentationFile>bin\Release\netstandard2.1\FlatFiles.xml</DocumentationFile>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netcoreapp3.0|AnyCPU'">
-    <DocumentationFile>bin\Debug\netcoreapp3.0\FlatFiles.xml</DocumentationFile>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netcoreapp3.0|AnyCPU'">
-    <DocumentationFile>bin\Release\netcoreapp3.0\FlatFiles.xml</DocumentationFile>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net451|AnyCPU'">
-    <DocumentationFile>bin\Debug\net451\FlatFiles.xml</DocumentationFile>
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|netstandard2.1|AnyCPU'">
+    <DocumentationFile>bin\Debug\netstandard2.1\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net451|AnyCPU'">
-    <DocumentationFile>bin\Release\net451\FlatFiles.xml</DocumentationFile>
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|netstandard2.1|AnyCPU'">
+    <DocumentationFile>bin\Release\netstandard2.1\FlatFiles.xml</DocumentationFile>
   </PropertyGroup>
 
   <ItemGroup>
@@ -78,27 +66,17 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.3" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.6'">
-    <PackageReference Include="System.Reflection.Emit" Version="4.3.0" />
-  </ItemGroup>
-  
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
-    <PackageReference Include="System.Reflection.Emit" Version="4.6.0" />
-    <PackageReference Include="System.Data.Common" Version="4.3.0" />
+    
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.1'">
-    <PackageReference Include="System.Reflection.Emit" Version="4.6.0" />
-    <PackageReference Include="System.Data.Common" Version="4.3.0" />
+  <ItemGroup Condition="'$(TargetFramework)'=='net462'">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="5.0.0" />
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='netcoreapp3.0'">
-    <PackageReference Include="System.Reflection.Emit" Version="4.6.0" />
-    <PackageReference Include="System.Data.Common" Version="4.3.0" />
+  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="5.0.0" />
+    <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/FlatFiles/IFlatFileDataRecord.cs b/FlatFiles/IFlatFileDataRecord.cs
index 5d8bcc4..dfa35bf 100644
--- a/FlatFiles/IFlatFileDataRecord.cs
+++ b/FlatFiles/IFlatFileDataRecord.cs
@@ -1,6 +1,4 @@
-#if NET451 || NETSTANDARD2_0 || NETCOREAPP
-
-using System;
+using System;
 using System.Data;
 
 namespace FlatFiles
@@ -53,5 +51,3 @@ public interface IFlatFileDataRecord : IDataRecord
         ulong GetUInt64(int i);
     }
 }
-
-#endif
\ No newline at end of file
diff --git a/FlatFiles/TypeMapping/FixedLengthTypeMapper.cs b/FlatFiles/TypeMapping/FixedLengthTypeMapper.cs
index 4e55964..4b00d4c 100644
--- a/FlatFiles/TypeMapping/FixedLengthTypeMapper.cs
+++ b/FlatFiles/TypeMapping/FixedLengthTypeMapper.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Threading.Tasks;
@@ -470,7 +469,6 @@ public interface IFixedLengthTypeMapper<TEntity> : IFixedLengthTypeConfiguration
         /// <returns>The entities that are extracted from the file.</returns>
         IEnumerable<TEntity> Read(TextReader reader, FixedLengthOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Reads the entities from the given reader.
         /// </summary>
@@ -478,7 +476,6 @@ public interface IFixedLengthTypeMapper<TEntity> : IFixedLengthTypeConfiguration
         /// <param name="options">The options controlling how the fixed-length document is read.</param>
         /// <returns>An asynchronous enumerable over the entities.</returns>
         IAsyncEnumerable<TEntity> ReadAsync(TextReader reader, FixedLengthOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed reader to read entities from the underlying document.
@@ -504,7 +501,6 @@ public interface IFixedLengthTypeMapper<TEntity> : IFixedLengthTypeConfiguration
         /// <param name="options">The options controlling how the separated value document is written.</param>
         Task WriteAsync(TextWriter writer, IEnumerable<TEntity> entities, FixedLengthOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Writes the given entities to the given writer.
         /// </summary>
@@ -512,7 +508,6 @@ public interface IFixedLengthTypeMapper<TEntity> : IFixedLengthTypeConfiguration
         /// <param name="entities">The entities to write to the document.</param>
         /// <param name="options">The options controlling how the separated value document is written.</param>
         Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, FixedLengthOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed writer to write entities to the underlying document.
@@ -770,7 +765,6 @@ public interface IDynamicFixedLengthTypeMapper : IDynamicFixedLengthTypeConfigur
         /// <returns>The entities that are extracted from the file.</returns>
         IEnumerable<object> Read(TextReader reader, FixedLengthOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Reads the entities from the given reader.
         /// </summary>
@@ -778,7 +772,6 @@ public interface IDynamicFixedLengthTypeMapper : IDynamicFixedLengthTypeConfigur
         /// <param name="options">The options controlling how the fixed-length document is read.</param>
         /// <returns>An asynchronous enumerable over the entities.</returns>
         IAsyncEnumerable<object> ReadAsync(TextReader reader, FixedLengthOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed reader to read entities from the underlying document.
@@ -804,7 +797,6 @@ public interface IDynamicFixedLengthTypeMapper : IDynamicFixedLengthTypeConfigur
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IEnumerable<object> entities, FixedLengthOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Writes the given entities to the given stream.
         /// </summary>
@@ -812,7 +804,6 @@ public interface IDynamicFixedLengthTypeMapper : IDynamicFixedLengthTypeConfigur
         /// <param name="entities">The entities to write to the stream.</param>
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IAsyncEnumerable<object> entities, FixedLengthOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed writer to write entities to the underlying document.
@@ -1369,13 +1360,11 @@ public IEnumerable<TEntity> Read(TextReader reader, FixedLengthOptions options =
             return typedReader.ReadAll();
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         public IAsyncEnumerable<TEntity> ReadAsync(TextReader reader, FixedLengthOptions options = null)
         {
             var typedReader = GetReader(reader, options);
             return typedReader.ReadAllAsync();
         }
-#endif
 
         public IFixedLengthTypedReader<TEntity> GetReader(TextReader reader, FixedLengthOptions options = null)
         {
@@ -1410,7 +1399,6 @@ public Task WriteAsync(TextWriter writer, IEnumerable<TEntity> entities, FixedLe
             return typedWriter.WriteAllAsync(entities);
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         public Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, FixedLengthOptions options = null)
         {
             if (entities == null)
@@ -1420,7 +1408,6 @@ public Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, Fi
             var typedWriter = GetWriter(writer, options);
             return typedWriter.WriteAllAsync(entities);
         }
-#endif
 
         public ITypedWriter<TEntity> GetWriter(TextWriter writer, FixedLengthOptions options = null)
         {
@@ -1629,14 +1616,12 @@ IEnumerable<object> IDynamicFixedLengthTypeMapper.Read(TextReader reader, FixedL
             return untypedReader.ReadAll();
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         IAsyncEnumerable<object> IDynamicFixedLengthTypeMapper.ReadAsync(TextReader reader, FixedLengthOptions options)
         {
             IDynamicFixedLengthTypeMapper untypedMapper = this;
             var untypedReader = untypedMapper.GetReader(reader, options);
             return untypedReader.ReadAllAsync();
         }
-#endif
 
         IFixedLengthTypedReader<object> IDynamicFixedLengthTypeMapper.GetReader(TextReader reader, FixedLengthOptions options)
         {
@@ -1657,14 +1642,12 @@ Task IDynamicFixedLengthTypeMapper.WriteAsync(TextWriter writer, IEnumerable<obj
             return untypedWriter.WriteAllAsync(entities);
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         Task IDynamicFixedLengthTypeMapper.WriteAsync(TextWriter writer, IAsyncEnumerable<object> entities, FixedLengthOptions options)
         {
             IDynamicFixedLengthTypeMapper untypedMapper = this;
             var untypedWriter = untypedMapper.GetWriter(writer, options);
             return untypedWriter.WriteAllAsync(entities);
         }
-#endif
 
         ITypedWriter<object> IDynamicFixedLengthTypeMapper.GetWriter(TextWriter writer, FixedLengthOptions options)
         {
diff --git a/FlatFiles/TypeMapping/SeparatedValueTypeMapper.cs b/FlatFiles/TypeMapping/SeparatedValueTypeMapper.cs
index 56ac11c..cb39293 100644
--- a/FlatFiles/TypeMapping/SeparatedValueTypeMapper.cs
+++ b/FlatFiles/TypeMapping/SeparatedValueTypeMapper.cs
@@ -675,7 +675,6 @@ public interface ISeparatedValueTypeMapper<TEntity> : ISeparatedValueTypeConfigu
         /// <returns>The entities that are extracted from the file.</returns>
         IEnumerable<TEntity> Read(TextReader reader, SeparatedValueOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Reads the entities from the given reader.
         /// </summary>
@@ -683,7 +682,6 @@ public interface ISeparatedValueTypeMapper<TEntity> : ISeparatedValueTypeConfigu
         /// <param name="options">The options controlling how the separated value document is read.</param>
         /// <returns>An asynchronous enumerable over the entities.</returns>
         IAsyncEnumerable<TEntity> ReadAsync(TextReader reader, SeparatedValueOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed reader to read entities from the underlying document.
@@ -709,7 +707,6 @@ public interface ISeparatedValueTypeMapper<TEntity> : ISeparatedValueTypeConfigu
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IEnumerable<TEntity> entities, SeparatedValueOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Writes the given entities to the given stream.
         /// </summary>
@@ -717,7 +714,6 @@ public interface ISeparatedValueTypeMapper<TEntity> : ISeparatedValueTypeConfigu
         /// <param name="entities">The entities to write to the stream.</param>
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, SeparatedValueOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed writer to write entities to the underlying document.
@@ -950,7 +946,6 @@ public interface IDynamicSeparatedValueTypeMapper : IDynamicSeparatedValueTypeCo
         /// <returns>The entities that are extracted from the file.</returns>
         IEnumerable<object> Read(TextReader reader, SeparatedValueOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Reads the entities from the given reader.
         /// </summary>
@@ -958,7 +953,6 @@ public interface IDynamicSeparatedValueTypeMapper : IDynamicSeparatedValueTypeCo
         /// <param name="options">The options controlling how the separated value document is read.</param>
         /// <returns>An asynchronous enumerable over the entities.</returns>
         IAsyncEnumerable<object> ReadAsync(TextReader reader, SeparatedValueOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed reader to read entities from the underlying document.
@@ -984,7 +978,6 @@ public interface IDynamicSeparatedValueTypeMapper : IDynamicSeparatedValueTypeCo
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IEnumerable<object> entities, SeparatedValueOptions options = null);
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Writes the given entities to the given stream.
         /// </summary>
@@ -992,7 +985,6 @@ public interface IDynamicSeparatedValueTypeMapper : IDynamicSeparatedValueTypeCo
         /// <param name="entities">The entities to write to the stream.</param>
         /// <param name="options">The options used to format the output.</param>
         Task WriteAsync(TextWriter writer, IAsyncEnumerable<object> entities, SeparatedValueOptions options = null);
-#endif
 
         /// <summary>
         /// Gets a typed writer to write entities to the underlying document.
@@ -1499,13 +1491,11 @@ public IEnumerable<TEntity> Read(TextReader reader, SeparatedValueOptions option
             return typedReader.ReadAll();
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         public IAsyncEnumerable<TEntity> ReadAsync(TextReader reader, SeparatedValueOptions options = null)
         {
             var typedReader = GetReader(reader, options);
             return typedReader.ReadAllAsync();
         }
-#endif
 
         public ISeparatedValueTypedReader<TEntity> GetReader(TextReader reader, SeparatedValueOptions options = null)
         {
@@ -1546,7 +1536,6 @@ public Task WriteAsync(TextWriter writer, IEnumerable<TEntity> entities, Separat
             return typedWriter.WriteAllAsync(entities);
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         public Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, SeparatedValueOptions options = null)
         {
             if (entities == null)
@@ -1556,7 +1545,6 @@ public Task WriteAsync(TextWriter writer, IAsyncEnumerable<TEntity> entities, Se
             var typedWriter = GetWriter(writer, options);
             return typedWriter.WriteAllAsync(entities);
         }
-#endif
 
         public ITypedWriter<TEntity> GetWriter(TextWriter writer, SeparatedValueOptions options = null)
         {
@@ -1763,14 +1751,12 @@ IEnumerable<object> IDynamicSeparatedValueTypeMapper.Read(TextReader reader, Sep
             return untypedReader.ReadAll();
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         IAsyncEnumerable<object> IDynamicSeparatedValueTypeMapper.ReadAsync(TextReader reader, SeparatedValueOptions options)
         {
             IDynamicSeparatedValueTypeMapper untypedMapper = this;
             var untypedReader = untypedMapper.GetReader(reader, options);
             return untypedReader.ReadAllAsync();
         }
-#endif
 
         ISeparatedValueTypedReader<object> IDynamicSeparatedValueTypeMapper.GetReader(TextReader reader, SeparatedValueOptions options)
         {
@@ -1791,14 +1777,12 @@ Task IDynamicSeparatedValueTypeMapper.WriteAsync(TextWriter writer, IEnumerable<
             return untypedWriter.WriteAllAsync(entities);
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         Task IDynamicSeparatedValueTypeMapper.WriteAsync(TextWriter writer, IAsyncEnumerable<object> entities, SeparatedValueOptions options)
         {
             IDynamicSeparatedValueTypeMapper untypedMapper = this;
             var untypedWriter = untypedMapper.GetWriter(writer, options);
             return untypedWriter.WriteAllAsync(entities);
         }
-#endif
 
         ITypedWriter<object> IDynamicSeparatedValueTypeMapper.GetWriter(TextWriter writer, SeparatedValueOptions options)
         {
diff --git a/FlatFiles/TypeMapping/TypedReader.cs b/FlatFiles/TypeMapping/TypedReader.cs
index 85f2585..3268d27 100644
--- a/FlatFiles/TypeMapping/TypedReader.cs
+++ b/FlatFiles/TypeMapping/TypedReader.cs
@@ -438,7 +438,6 @@ public static IEnumerable<TEntity> ReadAll<TEntity>(this ITypedReader<TEntity> r
             }
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Reads each record from the given reader, such that each record is retrieved asynchronously.
         /// </summary>
@@ -453,6 +452,5 @@ public static async IAsyncEnumerable<TEntity> ReadAllAsync<TEntity>(this ITypedR
                 yield return entity;
             }
         }
-#endif
     }
 }
diff --git a/FlatFiles/TypeMapping/TypedWriter.cs b/FlatFiles/TypeMapping/TypedWriter.cs
index 556f044..034ab24 100644
--- a/FlatFiles/TypeMapping/TypedWriter.cs
+++ b/FlatFiles/TypeMapping/TypedWriter.cs
@@ -244,7 +244,6 @@ public static async Task WriteAllAsync<TEntity>(this ITypedWriter<TEntity> write
             }
         }
 
-#if !NET451 && !NETSTANDARD1_6 && !NETSTANDARD2_0
         /// <summary>
         /// Writes all of the entities to the typed writer.
         /// </summary>
@@ -263,6 +262,5 @@ public static async Task WriteAllAsync<TEntity>(this ITypedWriter<TEntity> write
                 await writer.WriteAsync(entity).ConfigureAwait(false);
             }
         }
-#endif
     }
 }