diff --git a/HelloWorld.sln b/HelloWorld.sln
new file mode 100644
index 0000000..dd6d823
--- /dev/null
+++ b/HelloWorld.sln
@@ -0,0 +1,10 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35527.113 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Global
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/HelloWorld/HelloWorld.csproj b/HelloWorld/HelloWorld.csproj
index 8c7321d..b50b666 100644
--- a/HelloWorld/HelloWorld.csproj
+++ b/HelloWorld/HelloWorld.csproj
@@ -4,7 +4,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{DAFB1371-8B98-4CD9-916A-DC1E78E759AB}</ProjectGuid>
+    <ProjectGuid>{B80B122C-CBDD-4A93-850F-41E19732915A}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <RootNamespace>HelloWorld</RootNamespace>
     <AssemblyName>HelloWorld</AssemblyName>
diff --git a/HelloWorld/Helloworld.cs b/HelloWorld/Program.cs
similarity index 84%
rename from HelloWorld/Helloworld.cs
rename to HelloWorld/Program.cs
index ce1a398..42fc24b 100644
--- a/HelloWorld/Helloworld.cs
+++ b/HelloWorld/Program.cs
@@ -10,10 +10,8 @@ namespace HelloWorld
     {
         static void Main(string[] args)
         {
-
-            Console.WriteLine("Hello world!");
+            Console.WriteLine("Hello World!");
             Console.ReadKey();
-
         }
     }
 }
diff --git a/HelloWorld/Properties/AssemblyInfo.cs b/HelloWorld/Properties/AssemblyInfo.cs
index 00e6233..7754c5e 100644
--- a/HelloWorld/Properties/AssemblyInfo.cs
+++ b/HelloWorld/Properties/AssemblyInfo.cs
@@ -20,7 +20,7 @@ using System.Runtime.InteropServices;
 [assembly: ComVisible(false)]
 
 // 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
-[assembly: Guid("dafb1371-8b98-4cd9-916a-dc1e78e759ab")]
+[assembly: Guid("b80b122c-cbdd-4a93-850f-41e19732915a")]
 
 // 程序集的版本信息由下列四个值组成: 
 //