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+---
+title: Can the Worksheet.CodeName be modified? | Syncfusion
+description: This page explains that the Worksheet.CodeName property is read-only and cannot be modified using Syncfusion XlsIO.
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# Can the Worksheet.CodeName be modified?
+
+In Microsoft Excel, the CodeName property represents the programmatic identifier assigned to a worksheet, which can be used in VBA macros to reference the worksheet. When working with worksheets in Syncfusion XlsIO, you can retrieve the CodeName of a worksheet using the `CodeName` property.
+
+However, the `CodeName` property in XlsIO is **read-only**. This means you can read the existing codename of a worksheet, but you cannot change or modify it programmatically. The codename is assigned by Microsoft Excel and is part of the workbook's internal structure.
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