diff --git a/Directory.Build.props b/Directory.Build.props
index daedb5285..0d30b638e 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -22,10 +22,38 @@
     <PackageReleaseNotes>https://github.com/nissl-lab/npoi/discussions/1422</PackageReleaseNotes>
     <Copyright>Nissl LLC</Copyright>
     <PackageTags>xlsx xls Excel Word docx office ole</PackageTags>
+
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
-  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+  <PropertyGroup Label="XML Documentation" Condition=" '$(Configuration)' == 'Release' ">
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <NoWarn>$(NoWarn);CS0419</NoWarn> <!-- Ambiguous reference in cref attribute -->
+    <NoWarn>$(NoWarn);CS1570</NoWarn> <!-- XML comment has badly formed XML -->
+    <NoWarn>$(NoWarn);CS1572</NoWarn> <!-- XML comment has a param tag for XXX, but there is no parameter by that name -->
+    <NoWarn>$(NoWarn);CS1573</NoWarn> <!-- Parameter XXX has no matching param tag in the XML comment -->
+    <NoWarn>$(NoWarn);CS1574</NoWarn> <!-- XML comment has cref attribute xxx that could not be resolved -->
+    <NoWarn>$(NoWarn);CS1584</NoWarn> <!-- XML comment has syntactically incorrect cref attribute -->
+    <NoWarn>$(NoWarn);CS1587</NoWarn> <!-- XML comment is not placed on a valid language element -->
+    <NoWarn>$(NoWarn);CS1591</NoWarn> <!-- Missing XML comment for publicly visible type or member -->
+    <NoWarn>$(NoWarn);CS1734</NoWarn> <!-- XML comment on XXX has a paramref tag for YYY, but there is no parameter by that name -->
+  </PropertyGroup>
+
+  <PropertyGroup Label="Code Analysis">
+    <NoWarn>$(NoWarn);CS0108</NoWarn> <!-- XXX hides inherited member -->
+    <NoWarn>$(NoWarn);CS0114</NoWarn> <!-- XXX hides inherited member -->
+    <NoWarn>$(NoWarn);CS0162</NoWarn> <!-- Unreachable code detected -->
+    <NoWarn>$(NoWarn);CS0168</NoWarn> <!-- The variable XXX is declared but never used -->
+    <NoWarn>$(NoWarn);CS0169</NoWarn> <!-- Unreachable code detected -->
+    <NoWarn>$(NoWarn);CS0414</NoWarn> <!-- The field XXX is assigned but its value is never used -->
+    <NoWarn>$(NoWarn);CS0628</NoWarn> <!-- new protected member declared in sealed type -->
+    <NoWarn>$(NoWarn);CS0649</NoWarn> <!-- Field XXX is never assigned to -->
+    <NoWarn>$(NoWarn);CS0659</NoWarn> <!-- XXX overrides Object.Equals(object o) but does not override Object.GetHashCode() -->
+
+    <NoWarn>$(NoWarn);CS0612</NoWarn> <!-- XXX is obsolete -->
+    <NoWarn>$(NoWarn);CS0618</NoWarn> <!-- XXX is obsolete: deprecated POI XYZ -->
+
+    <NoWarn>$(NoWarn);SYSLIB0021;SYSLIB0051</NoWarn> <!-- Deprecated API usage -->
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/benchmarks/NPOI.Benchmarks/NPOI.Benchmarks.csproj b/benchmarks/NPOI.Benchmarks/NPOI.Benchmarks.csproj
index b5a548f40..8700c69f6 100644
--- a/benchmarks/NPOI.Benchmarks/NPOI.Benchmarks.csproj
+++ b/benchmarks/NPOI.Benchmarks/NPOI.Benchmarks.csproj
@@ -4,6 +4,7 @@
         <OutputType>Exe</OutputType>
         <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
+        <NoWarn>$(NoWarn);SYSLIB0014</NoWarn>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/main/HPSF/Section.cs b/main/HPSF/Section.cs
index 16cbae0cd..7efb869ae 100644
--- a/main/HPSF/Section.cs
+++ b/main/HPSF/Section.cs
@@ -565,7 +565,7 @@ public int Size
                     }
                     catch(HPSFRuntimeException ex)
                     {
-                        throw ex;
+                        throw;
                     }
                     catch(Exception ex)
                     {
diff --git a/testcases/Directory.Build.props b/testcases/Directory.Build.props
index 2262377e2..b7b77003b 100644
--- a/testcases/Directory.Build.props
+++ b/testcases/Directory.Build.props
@@ -7,4 +7,12 @@
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
+  <PropertyGroup Label="Code Analysis">
+    <NoWarn>$(NoWarn);CS0612</NoWarn> <!-- XXX is obsolete -->
+    <NoWarn>$(NoWarn);CS0618</NoWarn> <!-- XXX is obsolete: deprecated POI XYZ -->
+    <NoWarn>$(NoWarn);CS0162</NoWarn> <!-- Unreachable code detected -->
+    <NoWarn>$(NoWarn);CA2200</NoWarn> <!-- Re-throwing caught exception changes stack information -->
+    <NoWarn>$(NoWarn);SYSLIB0014</NoWarn> <!-- obsolete -->
+  </PropertyGroup>
+
 </Project>
\ No newline at end of file