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.NET Excel Library - Protect Excel documents using C#

  • Encrypt or decrypt Excel documents with a password.
  • Enable workbook and worksheet protection with a password.
  • Partially unlock cells in the worksheet.
Security in .NET Excel.
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.NET excel library security

Overview

The Syncfusion® .NET Excel library allows users to protect and unprotect Excel files in C# and VB.NET with various customization options. This prevents unnecessary data loss or modifications to Excel worksheets while making them available to others with limited access.

Encryption Code Example

This example code shows how to encrypt an Excel workbook with a password using the Syncfusion® .NET Excel Library with just a few lines of C# code.

Key Functions of Security

Discover how the Security features in the Syncfusion® Excel Library enhance data protection by providing robust mechanisms to safeguard Excel files from unauthorized access.

Net Excel Encrypt Workbook image

Encrypt Workbook

Add password protection to an Excel workbook to restrict access, ensuring that only authorized users can open and modify its contents.

Net Excel Decrypt Workbook image

Decrypt Workbook

Remove password protection from an Excel workbook, allowing access to its contents for editing and viewing without restrictions.

Net Excel Protect Workbook image

Protect Workbook

Secure the workbook with a password, preventing unauthorized changes to its structure.

Net Excel Protect Worksheet image

Protect Worksheet

Lock a worksheet with a password, preventing unauthorized edits to its content while allowing specific actions based on permissions.

Net Excel Unprotect Worksheet image

Unprotect Worksheet

Remove protection from a worksheet, granting full access to all content for editing or formatting purposes.

Net Excel Protect Cell image

Protect cell

Lock specific cells within a worksheet, restricting edits to ensure data integrity while allowing modifications to other cells.

Explore Security references

Discover valuable resources from our knowledge base articles to enhance your efficiency in using security.

Easy Ways to Protect Excel Data in C#

Blog

5 Easy Ways to Protect Excel Data in C#

Protect certain cells in C#, VB.NET and WinForms Excel

Knowledge base

How to protect certain cells in C#, VB.NET and WinForms Excel

Unlock cells and protect the worksheet for formatting columns in C#, VB.NET

Knowledge base

Unlock cells and protect the worksheet for formatting columns in C#, VB.NET

Syncfusion .NET Excel Library Resources

Explore these resources for comprehensive guides, knowledge base articles, insightful blogs, and ebooks.

Learning

.NET Excel documentation Documentation
.NET Excel api-reference API Reference
.NET Excel knowledge-base Knowledge Base
.NET Excel Ebooks E-Books
.NET Excel Web stories Web stories

Product Updates

.NET Excel Whats New What's New
.NET Excel Road Map Road Map
.NET Excel release-history Release History

Technical Support

.NET Excel contact-support Contact Support
.NET Excel forum Forums
.NET Excel Features & Bugs Features & Bugs

Frequently Asked Questions

Yes. You can remove a password from an Excel document by changing the password value to empty using the Syncfusion® .NET Excel library.

You can use Workbook protection, which uses the Syncfusion® Excel library to prevent adding or removing worksheets in the Excel document.

You can use the encryption feature from the Syncfusion® Excel library to set a password for the Excel document. This will ensure that only specific users with passwords can read the content.

You can open an Excel document in read-only mode by setting the ReadOnlyRecommended value to true using the Syncfusion® Excel library.

No. You can provide any combination of passwords for Excel documents.

No. It is not possible to open encrypted Excel documents without a password.

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