diff --git a/DigitalData.Core.Abstractions/ConfigurationExtension.cs b/DigitalData.Core.Abstractions/ConfigurationExtension.cs
index 175cf0c..9ca88f6 100644
--- a/DigitalData.Core.Abstractions/ConfigurationExtension.cs
+++ b/DigitalData.Core.Abstractions/ConfigurationExtension.cs
@@ -1,4 +1,5 @@
-using Microsoft.Extensions.Configuration;
+#if NET
+using Microsoft.Extensions.Configuration;
 
 namespace DigitalData.Core.Abstractions;
 
@@ -27,3 +28,4 @@ public static class ConfigurationExtension
             : configuration.GetSection(key).Get<T>())
         ?? new T();
 }
+#endif
\ No newline at end of file
diff --git a/DigitalData.Core.Abstractions/DeferredServiceProvider.cs b/DigitalData.Core.Abstractions/DeferredServiceProvider.cs
index 99a6fdd..0a07319 100644
--- a/DigitalData.Core.Abstractions/DeferredServiceProvider.cs
+++ b/DigitalData.Core.Abstractions/DeferredServiceProvider.cs
@@ -1,4 +1,5 @@
-namespace DigitalData.Core.Abstractions;
+#if NET
+namespace DigitalData.Core.Abstractions;
 
 /// <summary>
 /// A deferred implementation of <see cref="IServiceProvider"/> that allows the <see cref="IServiceProvider"/> instance 
@@ -38,3 +39,4 @@ public class DeferredServiceProvider : IServiceProvider
         return _serviceProvider.Value.GetService(serviceType);
     }
 }
+#endif
\ No newline at end of file
diff --git a/DigitalData.Core.Abstractions/DigitalData.Core.Abstractions.csproj b/DigitalData.Core.Abstractions/DigitalData.Core.Abstractions.csproj
index 29da05e..871c3ff 100644
--- a/DigitalData.Core.Abstractions/DigitalData.Core.Abstractions.csproj
+++ b/DigitalData.Core.Abstractions/DigitalData.Core.Abstractions.csproj
@@ -1,9 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
+		<TargetFrameworks>net462;net7.0;net8.0;net9.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
-		<Nullable>enable</Nullable>
 		<!-- NuGet Package Metadata -->
 		<PackageId>DigitalData.Core.Abstractions</PackageId>
 		<Authors>Digital Data GmbH</Authors>
@@ -17,9 +16,24 @@
 		<RepositoryUrl>http://git.dd:3000/AppStd/WebCoreModules.git</RepositoryUrl>
 		<PackAsTool>False</PackAsTool>
 		<PackageIcon>core_icon.png</PackageIcon>
-		<Version>4.1.0</Version>
-		<AssemblyVersion>4.1.0</AssemblyVersion>
-		<FileVersion>4.1.0</FileVersion>
+		<Version>4.1.1</Version>
+		<AssemblyVersion>4.1.1</AssemblyVersion>
+		<FileVersion>4.1.1</FileVersion>
+	</PropertyGroup>
+
+
+	<!-- disable for net462 -->
+	<PropertyGroup Condition="'$(TargetFramework)' == 'net462'">
+		<Nullable>disable</Nullable>
+		<ImplicitUsings>disable</ImplicitUsings>
+		<LangVersion>7.3</LangVersion>
+	</PropertyGroup>
+
+	<!-- enable for net7 and more -->
+	<PropertyGroup Condition="'$(TargetFramework)' == 'net7.0' Or '$(TargetFramework)' == 'net8.0' Or '$(TargetFramework)' == 'net9.0'">
+		<Nullable>enable</Nullable>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<LangVersion>latest</LangVersion>
 	</PropertyGroup>
 
 	<ItemGroup>
diff --git a/DigitalData.Core.Abstractions/Interfaces/IDto.cs b/DigitalData.Core.Abstractions/Interfaces/IDto.cs
index 9ac545a..e8d8b7d 100644
--- a/DigitalData.Core.Abstractions/Interfaces/IDto.cs
+++ b/DigitalData.Core.Abstractions/Interfaces/IDto.cs
@@ -1,4 +1,9 @@
-namespace DigitalData.Core.Abstractions.Interfaces;
+namespace DigitalData.Core.Abstractions.Interfaces
+#if NET
+    ;
+#elif NETFRAMEWORK
+    {
+#endif
 
 /// <summary>
 /// Ensures that extension methods are handled securely
@@ -6,4 +11,8 @@
 /// <typeparam name="Entity"></typeparam>
 public interface IDto<Entity> where Entity : IEntity
 {
-}
\ No newline at end of file
+}
+
+#if NETFRAMEWORK
+    }
+#endif
\ No newline at end of file
diff --git a/DigitalData.Core.Abstractions/Interfaces/IEntity.cs b/DigitalData.Core.Abstractions/Interfaces/IEntity.cs
index b89a217..fc0d754 100644
--- a/DigitalData.Core.Abstractions/Interfaces/IEntity.cs
+++ b/DigitalData.Core.Abstractions/Interfaces/IEntity.cs
@@ -1,8 +1,17 @@
-namespace DigitalData.Core.Abstractions.Interfaces;
+namespace DigitalData.Core.Abstractions.Interfaces
+#if NET
+    ;
+#elif NETFRAMEWORK
+    {
+#endif
 
 /// <summary>
 /// Ensures that extension methods are handled securely
 /// </summary>
 public interface IEntity
 {
-}
\ No newline at end of file
+}
+
+#if NETFRAMEWORK
+    }
+#endif
\ No newline at end of file
diff --git a/DigitalData.Core.Abstractions/ServiceProviderExtensions.cs b/DigitalData.Core.Abstractions/ServiceProviderExtensions.cs
index a12f5ca..82bd46b 100644
--- a/DigitalData.Core.Abstractions/ServiceProviderExtensions.cs
+++ b/DigitalData.Core.Abstractions/ServiceProviderExtensions.cs
@@ -1,4 +1,5 @@
-using Microsoft.Extensions.DependencyInjection;
+#if NET
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 
 namespace DigitalData.Core.Abstractions;
@@ -29,3 +30,4 @@ public static class ServiceProviderExtensions
     public static TOptions GetRequiredOptions<TOptions>(this IServiceProvider service) where TOptions : class
         => service.GetRequiredService<IOptions<TOptions>>().Value;
 }
+#endif
\ No newline at end of file