935073-FAQ to show how to override an Excel document using C#

Document-Processing-toc.html

@@ -2517,6 +2517,9 @@
 									<li>
 										<a href="/document-processing/excel/excel-library/net/faqs/how-to-show-the-leader-line-on-Excel-chart">How to show the leader line on Excel chart?</a>
 									</li>
+									<li>
+										<a href="/document-processing/excel/excel-library/net/faqs/how-to-override-an-Excel-document-using-C#">How to override an Excel document using C#?</a>
+									</li>
 								</ul>
 							</li>
 						</ul>

Document-Processing/Excel/Excel-Library/NET/FAQ.md

@@ -119,4 +119,5 @@ The frequently asked questions in Essential<sup>&reg;</sup> XlsIO are listed bel
 * [How to get the list of worksheet names in an Excel workbook?](faqs/how-to-get-the-list-of-worksheet-names-in-an-Excel-workbook)
 * [How to switch chart series data interpretation from horizontal (rows) to vertical (columns) in Excel?](faqs/how-to-switch-chart-series-data-interpretation-from-horizontal-(rows)-to-vertical-(columns)-in-Excel)
 * [How to add Oval shape to Excel chart using XlsIO?](faqs/how-to-add-oval-shape-to-Excel-chart)
-* [How to show the leader line on Excel chart?](faqs/how-to-show-the-leader-line-on-Excel-chart)
+* [How to show the leader line on Excel chart?](faqs/how-to-show-the-leader-line-on-Excel-chart)
+* [How to override an Excel document using C#?](faqs/how-to-override-an-Excel-document-using-C#)

Document-Processing/Excel/Excel-Library/NET/faqs/how-to-override-an-Excel-document-using-C#.md

@@ -0,0 +1,78 @@
+---
+title: How to override an Excel document using C# | Syncfusion
+description: Code example to override an existing Excel document using Syncfusion .NET Excel library (XlsIO).
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# How to override an Excel document using C#?
+
+You can override an existing Excel document by opening it, making necessary changes, and saving it using the Syncfusion XlsIO library.
+
+The following code examples demonstrate how to do this in C# (Cross-platform and Windows-specific) and VB.NET.
+
+{% tabs %} 
+{% highlight c# tabtitle="C# [Cross-platform]" playgroundButtonLink="https://raw.githubusercontent.com/SyncfusionExamples/XlsIO-Examples/master/FAQ/Override%20Excel%20Document/.NET/Override%20Excel%20Document/Override%20Excel%20Document/Program.cs,180" %}
+using (ExcelEngine excelEngine = new ExcelEngine())
+{
+    IApplication application = excelEngine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+
+    //Open an existing Excel file as stream
+    FileStream inputStream = new FileStream(Path.GetFullPath(@"Data/Sample.xlsx"), FileMode.Open, FileAccess.Read);
+    IWorkbook workbook = application.Workbooks.Open(inputStream);
+    IWorksheet worksheet = workbook.Worksheets[0];
+
+    //Modify the data
+    worksheet.Range["A1"].Text = "Hello World";
+
+    //Dispose input stream
+    inputStream.Dispose();
+
+    #region Save
+    //Saving the workbook
+    FileStream outputStream = new FileStream(Path.GetFullPath("Output/Sample.xlsx"), FileMode.Create, FileAccess.Write);
+    workbook.SaveAs(outputStream);
+    #endregion
+
+    //Dispose output stream
+    outputStream.Dispose();
+}
+{% endhighlight %}
+
+{% highlight c# tabtitle="C# [Windows-specific]" %} 
+using (ExcelEngine excelEngine = new ExcelEngine())
+{
+    IApplication application = excelEngine.Excel;
+    application.DefaultVersion = ExcelVersion.Xlsx;
+
+    //Open an existing Excel file
+    IWorkbook workbook = application.Workbooks.Open("Sample.xlsx");
+    IWorksheet worksheet = workbook.Worksheets[0];
+
+    //Modify the data
+    worksheet.Range["A1"].Text = "Hello World";
+
+    workbook.SaveAs("Sample.xlsx");
+}
+{% endhighlight %}
+
+{% highlight vb.net tabtitle="VB.NET [Windows-specific]" %}
+Using excelEngine As New ExcelEngine()
+    Dim application As IApplication = excelEngine.Excel
+    application.DefaultVersion = ExcelVersion.Xlsx
+
+    'Open an existing Excel file
+    Dim workbook As IWorkbook = application.Workbooks.Open("Sample.xlsx")
+    Dim worksheet As IWorksheet = workbook.Worksheets(0)
+
+    'Modify the data
+    worksheet.Range("A1").Text = "Hello World"
+
+    workbook.SaveAs("Sample.xlsx")
+End Using
+{% endhighlight %}
+{% endtabs %}
+
+A complete working example to override an Excel document in C# is present on [this GitHub page](https://github.com/SyncfusionExamples/XlsIO-Examples/tree/master/FAQ/Override%20Excel%20Document/.NET/Override%20Excel%20Document).