diff --git a/LeetCodeSharp.sln b/LeetCodeSharp.sln
deleted file mode 100644
index 9f13ded..0000000
--- a/LeetCodeSharp.sln
+++ /dev/null
@@ -1,43 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.9.34607.119
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LeetCodeSharp", "LeetCodeSharp\LeetCodeSharp.csproj", "{EB1DDDC1-A2FC-4AAB-A21A-59FAAFF656DD}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LeetCodeSharp.Fetcher", "LeetCodeSharp.Fetcher\LeetCodeSharp.Fetcher.csproj", "{5D45BB2A-E512-4353-8746-6F0B79282C76}"
-EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LeetCodeSharp.Tests", "LeetCodeSharp.Tests\LeetCodeSharp.Tests.csproj", "{97E271FD-7244-4DD2-982C-103DF1E92B7C}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{1F55C3BE-2E8E-47CB-B46A-7B607A196BA1}"
-	ProjectSection(SolutionItems) = preProject
-		justfile = justfile
-		README.md = README.md
-	EndProjectSection
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{EB1DDDC1-A2FC-4AAB-A21A-59FAAFF656DD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{EB1DDDC1-A2FC-4AAB-A21A-59FAAFF656DD}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{EB1DDDC1-A2FC-4AAB-A21A-59FAAFF656DD}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{EB1DDDC1-A2FC-4AAB-A21A-59FAAFF656DD}.Release|Any CPU.Build.0 = Release|Any CPU
-		{5D45BB2A-E512-4353-8746-6F0B79282C76}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5D45BB2A-E512-4353-8746-6F0B79282C76}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5D45BB2A-E512-4353-8746-6F0B79282C76}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5D45BB2A-E512-4353-8746-6F0B79282C76}.Release|Any CPU.Build.0 = Release|Any CPU
-		{97E271FD-7244-4DD2-982C-103DF1E92B7C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{97E271FD-7244-4DD2-982C-103DF1E92B7C}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{97E271FD-7244-4DD2-982C-103DF1E92B7C}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{97E271FD-7244-4DD2-982C-103DF1E92B7C}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {D28602CA-DA79-4D3C-A539-2FEB01BBEDA4}
-	EndGlobalSection
-EndGlobal
diff --git a/LeetCodeSharp.slnx b/LeetCodeSharp.slnx
new file mode 100644
index 0000000..08016de
--- /dev/null
+++ b/LeetCodeSharp.slnx
@@ -0,0 +1,9 @@
+<Solution>
+  <Folder Name="/Solution Items/">
+    <File Path="justfile" />
+    <File Path="README.md" />
+  </Folder>
+  <Project Path="LeetCodeSharp.Fetcher/LeetCodeSharp.Fetcher.csproj" />
+  <Project Path="LeetCodeSharp.Tests/LeetCodeSharp.Tests.csproj" />
+  <Project Path="LeetCodeSharp/LeetCodeSharp.csproj" />
+</Solution>
diff --git a/LeetCodeSharp/LeetCodeSharp.csproj b/LeetCodeSharp/LeetCodeSharp.csproj
index cbf69d7..f38fc33 100644
--- a/LeetCodeSharp/LeetCodeSharp.csproj
+++ b/LeetCodeSharp/LeetCodeSharp.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>netstandard2.1</TargetFramework>
+		<TargetFramework>net9.0</TargetFramework>
 		<ImplicitUsings>disable</ImplicitUsings>
 		<Nullable>disable</Nullable>
 	</PropertyGroup>
diff --git a/LeetCodeSharp/Problems/Solution2296.cs b/LeetCodeSharp/Problems/Solution2296.cs
index 01feabb..00b6d0f 100644
--- a/LeetCodeSharp/Problems/Solution2296.cs
+++ b/LeetCodeSharp/Problems/Solution2296.cs
@@ -10,7 +10,7 @@ namespace LeetCodeSharp.Problems2296
 
     public class TextEditor
     {
-        private readonly LinkedList<char> _text = new LinkedList<char>();
+        private readonly LinkedList<char> _text = new();
 
         // 让游标就是光标左边的字符
         private LinkedListNode<char> _cursor;