diff --git a/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception.slnx b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception.slnx
new file mode 100644
index 00000000..c3e22e87
--- /dev/null
+++ b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception.slnx
@@ -0,0 +1,3 @@
+<Solution>
+  <Project Path="Unauthorize_Exception/Unauthorize_Exception.csproj" />
+</Solution>
diff --git a/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Data/InputTemplate.xlsm b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Data/InputTemplate.xlsm
new file mode 100644
index 00000000..829f03c9
Binary files /dev/null and b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Data/InputTemplate.xlsm differ
diff --git a/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Output/.gitkeep b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Output/.gitkeep
new file mode 100644
index 00000000..e69de29b
diff --git a/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Program.cs b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Program.cs
new file mode 100644
index 00000000..9131c5bb
--- /dev/null
+++ b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Program.cs
@@ -0,0 +1,28 @@
+using Syncfusion.XlsIO;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        //Create an instance of ExcelEngine
+        using (ExcelEngine excelEngine = new ExcelEngine())
+        {
+            //Set the default version as Excel 2016
+            excelEngine.Excel.DefaultVersion = ExcelVersion.Excel2016;
+
+            File.SetAttributes(Path.GetFullPath("Data/InputTemplate.xlsm"), FileAttributes.Normal);
+
+            //Create a workbook
+            IWorkbook workbook = excelEngine.Excel.Workbooks.Open(Path.GetFullPath("Data/InputTemplate.xlsm"));
+
+            IWorksheet worksheet = workbook.Worksheets[0];
+
+            worksheet.Range["A2"].Text = "Hello, World!";
+
+            File.SetAttributes(Path.GetFullPath("Data/InputTemplate.xlsm"), FileAttributes.Hidden);
+
+            //Save the workbook to disk in xlsx format
+            workbook.SaveAs(Path.GetFullPath("Output/Output.xlsm"));
+        }
+    }
+}
diff --git a/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Unauthorize_Exception.csproj b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Unauthorize_Exception.csproj
new file mode 100644
index 00000000..9911aad6
--- /dev/null
+++ b/FAQ/Unathorize_Exception/.NET/Unauthorize_Exception/Unauthorize_Exception/Unauthorize_Exception.csproj
@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.XlsIO.Net.Core" Version="*" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="Data\*">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Output\*">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>