diff --git a/exercises/concept/roll-the-die/roll-the-die.sln b/exercises/concept/roll-the-die/roll-the-die.sln
new file mode 100644
index 000000000..709879b43
--- /dev/null
+++ b/exercises/concept/roll-the-die/roll-the-die.sln
@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RollTheDie", "RollTheDie.csproj", "{9BEC8997-1536-E219-AB7E-C9E14F72A896}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9BEC8997-1536-E219-AB7E-C9E14F72A896}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9BEC8997-1536-E219-AB7E-C9E14F72A896}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9BEC8997-1536-E219-AB7E-C9E14F72A896}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9BEC8997-1536-E219-AB7E-C9E14F72A896}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1CB3F184-414B-480B-AD48-8EFEE512B8A3}
+	EndGlobalSection
+EndGlobal
diff --git a/exercises/practice/binary-search/binary-search.sln b/exercises/practice/binary-search/binary-search.sln
new file mode 100644
index 000000000..314f3e7e3
--- /dev/null
+++ b/exercises/practice/binary-search/binary-search.sln
@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BinarySearch", "BinarySearch.csproj", "{065D0EF9-071B-72F0-5F7E-0AA72E56899A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{065D0EF9-071B-72F0-5F7E-0AA72E56899A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{065D0EF9-071B-72F0-5F7E-0AA72E56899A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{065D0EF9-071B-72F0-5F7E-0AA72E56899A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{065D0EF9-071B-72F0-5F7E-0AA72E56899A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C88155BC-5A4C-48AD-9EE0-E3CA9FF3C5A9}
+	EndGlobalSection
+EndGlobal
diff --git a/exercises/practice/hello-world/HelloWorld.cs b/exercises/practice/hello-world/HelloWorld.cs
index 934c93913..5784ca411 100644
--- a/exercises/practice/hello-world/HelloWorld.cs
+++ b/exercises/practice/hello-world/HelloWorld.cs
@@ -1,4 +1,4 @@
 public static class HelloWorld
 {
-    public static string Hello() => "Goodbye, Mars!";
+    public static string Hello() => "Hello, World!";
 }
diff --git a/exercises/practice/hello-world/hello-world.sln b/exercises/practice/hello-world/hello-world.sln
new file mode 100644
index 000000000..157b78044
--- /dev/null
+++ b/exercises/practice/hello-world/hello-world.sln
@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HelloWorld", "HelloWorld.csproj", "{5082FA0B-EAB0-978A-084C-F92A05706358}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5082FA0B-EAB0-978A-084C-F92A05706358}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5082FA0B-EAB0-978A-084C-F92A05706358}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5082FA0B-EAB0-978A-084C-F92A05706358}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5082FA0B-EAB0-978A-084C-F92A05706358}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {47BEF35C-8701-4A23-83B8-1046B07DFF9C}
+	EndGlobalSection
+EndGlobal