How to protect Excel file with password in VB.NET

' Tutorial 27
' This tutorial shows how to create an Excel file in VB.NET and
' encrypt the Excel file by setting the password required for opening the file.
' -----------------------------------------------------------------------------

Imports EasyXLS

Module Tutorial27

    Sub Main()

        Console.WriteLine("Tutorial 27" & vbCrLf & "----------" & vbCrLf)

        ' Create an instance of the class that exports Excel files, having two sheets
        Dim workbook As New ExcelDocument(2)

        ' Set the sheet names
        workbook.easy_getSheetAt(0).setSheetName("First tab")
        workbook.easy_getSheetAt(1).setSheetName("Second tab")
        ' Set the password for protecting the Excel file when the file is open
        ' Export Excel file
        Console.WriteLine("Writing file C:\Samples\Tutorial27 - protect Excel with password and encryption.xlsx.")
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial27 - protect Excel with password and encryption.xlsx")

        ' Confirm export of Excel file
        Dim sError As String = workbook.easy_getError()
        If (sError.Equals("")) Then
            Console.Write(vbCrLf & "File successfully created. Press Enter to Exit...")
            Console.Write(vbCrLf & "Error encountered: " & sError & vbCrLf & "Press Enter to Exit...")
        End If

        ' Dispose memory

    End Sub

End Module

EasyXLS Excel libraries:

Excel Library for VB.NET
full .NET version to import, export or convert Excel files
Excel Writer for VB.NET
.NET version to create and export Excel files
Download EasyXLS™ Excel Library for VB.NET

File formats:

MS Excel 97 - 2003
MS Excel 2007 - 2010
MS Excel 2013
MS Excel 2016
MS Excel 2019