Downgrade target .NET version to .netframework 4.7.2

csharp/SVGLDLibs/SVGLDLibs.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SVGLDLibs", "SVGLDLibs\SVGLDLibs.csproj", "{462AAD8D-9C0F-44E0-BF9B-B7533741C1FD}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SVGLDWebAPI", "SVGLDWebAPI\SVGLDWebAPI.csproj", "{22E1C9F8-9019-481A-9658-0DFE5F363B34}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{462AAD8D-9C0F-44E0-BF9B-B7533741C1FD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{462AAD8D-9C0F-44E0-BF9B-B7533741C1FD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{462AAD8D-9C0F-44E0-BF9B-B7533741C1FD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{462AAD8D-9C0F-44E0-BF9B-B7533741C1FD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{22E1C9F8-9019-481A-9658-0DFE5F363B34}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{22E1C9F8-9019-481A-9658-0DFE5F363B34}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{22E1C9F8-9019-481A-9658-0DFE5F363B34}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{22E1C9F8-9019-481A-9658-0DFE5F363B34}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AB7354D7-38C1-482B-A973-01AD4E554A3F}
+	EndGlobalSection
+EndGlobal

csharp/SVGLDLibs/SVGLDLibs/SVGLDLibs.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net6.0</TargetFramework>
+        <TargetFramework>net472</TargetFramework>
         <ImplicitUsings>disable</ImplicitUsings>
         <Nullable>disable</Nullable>
     </PropertyGroup>