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

Document-Processing-toc.html

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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-remove-all-the-listobjects-from-the-sheet">How to remove all the ListObjects from the sheet?</a>
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 									    <a href="/document-processing/excel/excel-library/net/faqs/how-to-assign-cell-value-without-changing-format-type-in-xlsio">How to assign cell value without changing the format type in XlsIO?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-retrieve-data-from-merged-cells-using-xlsio">How to retrieve data from merged cells using XlsIO?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-convert-inches-to-points-in-syncfusion-xlsio">How to convert inches to points in Syncfusion XlsIO?</a>
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-                    <a href="/document-processing/excel/excel-library/net/faqs/how-to-preserve-line-breaks-when-saving-excel-as-csv">How to preserve line breaks when saving Excel as CSV?</a>
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+									<li>
+										<a href="/document-processing/excel/excel-library/net/faqs/how-to-preserve-line-breaks-when-saving-excel-as-csv">How to preserve line breaks when saving Excel as CSV?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/why-text-with-double-quotes-gets-enclosed-in-double-quotes-when-saving-as-csv">Why does text with double quotes get enclosed in double quotes when saving as CSV?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-detect-whether-a-column-is-hidden-in-an-excel-file-using-xlsio">How to detect whether a column is hidden in an Excel file using XlsIO?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-set-invert-if-negative-option-for-a-chart">How to set invert if negative option for a chart using XLsIO?</a>
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 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-merge-cells-preserving-topleft-value-and-format-in-xlsio">How to merge cells preserving topleft value and format in XlsIO?</a>
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+										<a href="/document-processing/excel/excel-library/net/faqs/how-to-open-excel-file-as-readonly-option-in-microsoft-excel-using-xlsio">How to open Excel file as ReadOnly in Microsoft Excel using XlsIO?</a>
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Document-Processing/Excel/Excel-Library/NET/faqs/how-to-open-excel-file-as-readonly-option-in-microsoft-excel-using-xlsio.md

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+---
+title: How to Open Excel as Read‑Only using XlsIO | Syncfusion
+description: Shows how to set the 'Read-only recommended' flag when saving an Excel workbook with Syncfusion XlsIO so Excel prompts to open it as read-only.
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# How to open Excel file as ReadOnly in Microsoft Excel using XlsIO?
+
+You can make Excel prompt users to open a workbook as read-only by setting the Read-only recommended flag on the workbook before saving. The example below shows how to set this flag with Syncfusion XlsIO and save the file so Microsoft Excel offers the "Read-only recommended" option when the file is opened.
+
+The following code examples illustrate this.
+
+{% tabs %}
+{% highlight c# tabtitle="C# [Cross-platform]" %}
+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"));
+}
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %}
+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("Output.xlsx");
+}
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+Using excelEngine As New ExcelEngine()
+    ' Instantiate the Excel application object
+    Dim application As IApplication = excelEngine.Excel
+
+    ' Assigns default application version
+    application.DefaultVersion = ExcelVersion.Xlsx
+
+    ' Create a workbook with 1 worksheet
+    Dim workbook As IWorkbook = application.Workbooks.Create(1)
+    ' Access first worksheet from the workbook
+    Dim worksheet As IWorksheet = workbook.Worksheets(0)
+
+    ' Adding text to a cell
+    worksheet("A1").Text = "Hello World"
+
+    ' Protect the worksheet
+    worksheet.Protect("syncfusion", ExcelSheetProtection.All)
+
+    ' Save the workbook to disk in XLSX format
+    workbook.SaveAs("Sample.xlsx")
+End Using
+{% endhighlight %}
+{% endtabs %}
+
+
+A complete working example in C# is present on <a href="https://github.com/SyncfusionExamples/XlsIO-Examples/tree/992377-ReadOnly-Excel/FAQ/ReadOnly%20Excel/.NET/Readonly%20Excel">this GitHub page</a>.