net35 does not play nicely with dotnet build from Core SDKs (see https://github.com/Microsoft/msbuild/issues/1333) - therefore removed net35 target (to be discussed if ok)

ICSharpCode.AvalonEdit.Sample/ICSharpCode.AvalonEdit.Sample.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFrameworks>netcoreapp3.0;net40;net45;net35</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.0;net40;net45</TargetFrameworks>
 	<UseWPF>true</UseWPF>
 	<UseWindowsForms>true</UseWindowsForms>
 	<DefineConstants>TRACE;DOTNET4</DefineConstants>
@@ -21,19 +21,12 @@
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <DefineConstants>TRACE;DOTNET4</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net35' ">
-    <DefineConstants>TRACE</DefineConstants>
-  </PropertyGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net40' ">
 		<Reference Include="System.Windows.Forms" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
 		<Reference Include="System.Windows.Forms" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net35' ">
-		<Reference Include="System.Windows.Forms" />
-		<Reference Include="System.Web" />
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\ICSharpCode.AvalonEdit\ICSharpCode.AvalonEdit.csproj" />
   </ItemGroup>

ICSharpCode.AvalonEdit.Tests/ICSharpCode.AvalonEdit.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFrameworks>net40;net45;net35</TargetFrameworks>
+    <TargetFrameworks>net40;net45</TargetFrameworks>
 	<UseWPF>true</UseWPF>
 	<UseWindowsForms>true</UseWindowsForms>
 	<DefineConstants>TRACE;DOTNET4</DefineConstants>
@@ -20,9 +20,6 @@
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <DefineConstants>TRACE;DOTNET4</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net35' ">
-    <DefineConstants>TRACE</DefineConstants>
-  </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="NUnit" Version="3.11.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />

ICSharpCode.AvalonEdit/ICSharpCode.AvalonEdit.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFrameworks>netcoreapp3.0;net40;net45;net35</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.0;net40;net45</TargetFrameworks>
     <UseWPF>true</UseWPF>
     <UseWindowsForms>true</UseWindowsForms>
     <DefineConstants>TRACE;DOTNET4</DefineConstants>
@@ -38,19 +38,12 @@
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <DefineConstants>TRACE;DOTNET4</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net35' ">
-    <DefineConstants>TRACE</DefineConstants>
-  </PropertyGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net40' ">
     <Reference Include="System.Windows.Forms" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
     <Reference Include="System.Windows.Forms" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net35' ">
-    <Reference Include="System.Windows.Forms" />
-    <Reference Include="System.Web" />
-  </ItemGroup>
   <ItemGroup>
     <None Remove="Search\next.png" />
     <None Remove="Search\prev.png" />