From 2f0c31f2ea9c2d3216aaf457a95359b774101b21 Mon Sep 17 00:00:00 2001
From: Tony Qu <tonyqus@gmail.com>
Date: Tue, 30 Sep 2025 08:50:40 +0800
Subject: [PATCH] fix #1369

---
 ooxml/XSSF/UserModel/XSSFDataValidationConstraint.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ooxml/XSSF/UserModel/XSSFDataValidationConstraint.cs b/ooxml/XSSF/UserModel/XSSFDataValidationConstraint.cs
index 7f5a39a2b..7aea233f8 100644
--- a/ooxml/XSSF/UserModel/XSSFDataValidationConstraint.cs
+++ b/ooxml/XSSF/UserModel/XSSFDataValidationConstraint.cs
@@ -20,6 +20,7 @@ limitations under the License.
 using NPOI.Util;
 using NPOI.OpenXmlFormats.Spreadsheet;
 using System.Text.RegularExpressions;
+using NPOI.OpenXml4Net.Util;
 
 namespace NPOI.XSSF.UserModel
 {
@@ -127,7 +128,7 @@ public String[] ExplicitListValues
                         {
                             builder.Append(LIST_SEPARATOR);
                         }
-                        builder.Append(string1);
+                        builder.Append(XmlHelper.EncodeCDATAContent(string1));
                     }
                     builder.Append(QUOTE);
                     Formula1 = builder.ToString();