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Does XlsIO support internal links when converting Excel to PDF?
+
+ How to prevent a ParseException when modifying formulas with undefined named ranges in a workbook?
+
+
+ What is the maximum number of hyperlinks allowed in an Excel worksheet?
+
+
+ What is the maximum number of characters allowed in a single Excel cell?
+
diff --git a/Document-Processing/Excel/Excel-Library/NET/faqs/how-to-prevent-a-parse-exception-when-modifying-formulas-with-undefined-named-ranges-in-a-workbook.md b/Document-Processing/Excel/Excel-Library/NET/faqs/how-to-prevent-a-parse-exception-when-modifying-formulas-with-undefined-named-ranges-in-a-workbook.md
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+---
+title: Prevent ParseException when updating formulas | Syncfusion
+description: This page explains how to prevent ParseException when modifying formulas with undefined named ranges in Syncfusion .NET Excel library (XlsIO).
+platform: document-processing
+control: XlsIO
+documentation: UG
+---
+
+# Prevent ParseException from undefined named ranges
+
+To prevent a ParseException when modifying formulas that reference undefined named ranges, set the following property before updating the formula:
+
+**C# Code:**
+~~~
+workbook.ThrowOnUnknownNames = false;
+~~~
+
+This ensures that formulas with undefined named ranges won't trigger errors during assignment or modification.
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