UG documentation 992377: FAQ for How to open the excel file read only option when using XLSIO

FAQ/ReadOnly Excel/.NET/Readonly Excel/Readonly Excel.slnx

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+<Solution>
+  <Project Path="Readonly Excel/Readonly Excel.csproj" />
+</Solution>

FAQ/ReadOnly Excel/.NET/Readonly Excel/Readonly Excel/Program.cs

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+using Syncfusion.XlsIO;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        using (ExcelEngine excelEngine = new ExcelEngine())
+        {
+            // Instantiate the Excel application object
+            IApplication application = excelEngine.Excel;
+
+            // Assigns default application version
+            application.DefaultVersion = ExcelVersion.Xlsx;
+
+            // Create a workbook with 1 worksheet
+            IWorkbook workbook = application.Workbooks.Create(1);
+
+            // Access first worksheet from the workbook
+            IWorksheet worksheet = workbook.Worksheets[0];
+
+            // Adding text to a cell
+            worksheet.Range["A1"].Text = "Hello World";
+
+            // Protect the worksheet
+            worksheet.Protect("syncfusion", ExcelSheetProtection.All);
+
+            // Save the workbook to disk in XLSX format
+            workbook.SaveAs(Path.GetFullPath("Output/Output.xlsx"));
+        }
+    }
+}

FAQ/ReadOnly Excel/.NET/Readonly Excel/Readonly Excel/Readonly Excel.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Readonly_Excel</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.XlsIO.Net.Core" Version="*" />
+  </ItemGroup>
+
+	<ItemGroup>
+		<None Update="Output\*">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+		</None>
+	</ItemGroup>
+
+</Project>