diff --git a/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes.csproj b/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes.csproj
index bae5b9f..b0122d7 100644
--- a/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes.csproj
+++ b/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes.csproj
@@ -1,9 +1,21 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net7.0;net8.0;net9.0</TargetFrameworks>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
+    <TargetFrameworks>net462;net7.0;net8.0;net9.0</TargetFrameworks>
+  </PropertyGroup>
+	
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net462'">
+	<ImplicitUsings>disable</ImplicitUsings>
+	<LangVersion>7.3</LangVersion>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TargetFramework)' != 'net462'">
+	<ImplicitUsings>enable</ImplicitUsings>
+	<LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net462'">
+	  <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
+  </ItemGroup>
+
 </Project>
diff --git a/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/TemplatePlaceholderAttribute.cs b/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/TemplatePlaceholderAttribute.cs
index d473986..551dbff 100644
--- a/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/TemplatePlaceholderAttribute.cs
+++ b/DigitalData.EmailProfilerDispatcher.Abstraction.Attributes/TemplatePlaceholderAttribute.cs
@@ -1,4 +1,8 @@
-namespace DigitalData.EmailProfilerDispatcher.Abstraction.Attributes
+#if NETFRAMEWORK
+using System;
+#endif
+
+namespace DigitalData.EmailProfilerDispatcher.Abstraction.Attributes
 {
 	[AttributeUsage(AttributeTargets.Property)]
 	public class TemplatePlaceholderAttribute : Attribute