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How to make a WinForms Spreadsheet (SfSpreadsheet) as read only?
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Protection
To make Spreadsheet as read only, you need to protect both Workbook and Worksheet using Protect and ProtectSheet method respectively, like below code example.
C#
Spreadsheet.Protect(true, true,""); Spreadsheet.ProtectSheet(Spreadsheet.ActiveSheet, "");
Samples:
Reference link: https://help.syncfusion.com/windowsforms/spreadsheet/worksheet-management#protection