Move classes to Library project targeting ns2.0

Author: rockfordlhotka

DataErrorInfo.csproj

@@ -5,4 +5,8 @@
     <TargetFramework>net5.0</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Library\Library.csproj" />
+  </ItemGroup>
+
 </Project>

DataErrorInfo.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31515.178
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DataErrorInfo", "DataErrorInfo.csproj", "{B08F6435-8A3A-4235-BC53-CF3B7E143954}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Library", "..\Library\Library.csproj", "{C7397E07-B946-4512-BDA9-69A2B6053778}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B08F6435-8A3A-4235-BC53-CF3B7E143954}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B08F6435-8A3A-4235-BC53-CF3B7E143954}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B08F6435-8A3A-4235-BC53-CF3B7E143954}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B08F6435-8A3A-4235-BC53-CF3B7E143954}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C7397E07-B946-4512-BDA9-69A2B6053778}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C7397E07-B946-4512-BDA9-69A2B6053778}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C7397E07-B946-4512-BDA9-69A2B6053778}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C7397E07-B946-4512-BDA9-69A2B6053778}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {EDC62B49-3759-4FB1-9CF1-A5BC7DD19288}
+	EndGlobalSection
+EndGlobal

ErrorBase.cs

@@ -1,4 +1,5 @@
-using System;
+using Library;
+using System;
 using System.Collections;
 using System.ComponentModel;
 using System.Text;