How to Set Password to Worksheet

by Chaknith Bin

Restricting a worksheet with a Read-Only authentication is a very common requirement for data files. IronXL makes it easy to apply Read-Only protection to worksheets in .NET.

How to Password Protect Worksheets

1. Download the C# library to password protect worksheets
2. Access the password-protected worksheet in the opened workbook
3. Apply password protection to the selected worksheet
4. Remove password protection from the selected worksheet
5. Export the spreadsheet to different spreadsheet formats

Install with NuGet

Install-Package IronXL.Excel

nuget.org/packages/IronXL.Excel/

or

Download DLL

Download DLL

Manually install into your project

Access a Password Protected Worksheet

IronXL allows you to access and modify any protected worksheet without requiring the password. Once the spreadsheet is opened with IronXL, you can modify any cell in any worksheet.

Apply Password to Worksheet

To restrict modifications to a worksheet while allowing users to view its content in Excel, use the ProtectSheet method with a password as a parameter. For example, workSheet.ProtectSheet("IronXL"). This sets a password-based ReadOnly authentication for the selected worksheet.

:path=/static-assets/excel/content-code-examples/how-to/set-password-worksheet-protect.cs

using IronXL;

WorkBook workBook = WorkBook.Load("sample.xlsx");
WorkSheet workSheet = workBook.DefaultWorkSheet;

// Set protection for selected worksheet
workSheet.ProtectSheet("IronXL");

workBook.Save();

Imports IronXL

Private workBook As WorkBook = WorkBook.Load("sample.xlsx")
Private workSheet As WorkSheet = workBook.DefaultWorkSheet

' Set protection for selected worksheet
workSheet.ProtectSheet("IronXL")

workBook.Save()

Open a Password-Protected Worksheet

Remove Password from Worksheet

To remove a password from a specific worksheet, you can use the UnprotectSheet method. Simply call workSheet.UnprotectSheet() to remove any password associated with the worksheet.

:path=/static-assets/excel/content-code-examples/how-to/set-password-worksheet-unprotect.cs

// Remove protection for selected worksheet. It works without password!
workSheet.UnprotectSheet();

' Remove protection for selected worksheet. It works without password!
workSheet.UnprotectSheet()

IronXL allows you to protect and unprotect any Excel workbook and worksheet with a single line of C# code.