public class EncryptedFilePasswordCheckFailedEventArgs :
    HandledEventArgs

Public Class EncryptedFilePasswordCheckFailedEventArgs
    Inherits HandledEventArgs

static bool IsValid { get; set; }

static void Main(string[] args) {
    Workbook workbook = new Workbook();

    workbook.EncryptedFilePasswordRequest += Workbook_EncryptedFilePasswordRequest;
    workbook.EncryptedFilePasswordCheckFailed += Workbook_EncryptedFilePasswordCheckFailed;
    workbook.InvalidFormatException += Workbook_InvalidFormatException;

    workbook.LoadDocument("Documents\\encrypted.xlsx");
}

private static void Workbook_EncryptedFilePasswordRequest(object sender, EncryptedFilePasswordRequestEventArgs e) {
    //Prompt the user to enter the password
    Console.WriteLine("Enter password:");
    e.Password = Console.ReadLine();
    e.Handled = true;
    IsValid = true;
}

private static void Workbook_EncryptedFilePasswordCheckFailed(object sender, EncryptedFilePasswordCheckFailedEventArgs e) {
    //Analyze the password error:
    switch (e.Error) {

        //If the password is empty, raise the request again
        case SpreadsheetDecryptionError.PasswordRequired:
            Console.WriteLine("You did not enter the password!");
            e.TryAgain = true;
            e.Handled = true;
            break;
        //If the password is invalid, ask user whether to continue the operation:
        case SpreadsheetDecryptionError.WrongPassword:
            Console.WriteLine("The password is incorrect. Try Again? (y/n)");
            string answer = Console.ReadLine()?.ToLower();
            if (answer == "y") {
                e.TryAgain = true;
                e.Handled = true;
            }
            //If user cancels the operation, show an exception message:
            else {
                IsValid = false;
            }
            break;
    }
    Program.IsValid = false;
}

    private static void Workbook_InvalidFormatException(object sender, SpreadsheetInvalidFormatExceptionEventArgs e) {
    Console.WriteLine(e.Exception.Message.ToString() + " Press any key to close...");
    Console.ReadKey(true);
}

Private Shared Property IsValid As Boolean

Shared Sub Main(ByVal args() As String)
    Dim workbook As New Workbook()

    AddHandler workbook.EncryptedFilePasswordRequest, AddressOf Workbook_EncryptedFilePasswordRequest
    AddHandler workbook.EncryptedFilePasswordCheckFailed, AddressOf Workbook_EncryptedFilePasswordCheckFailed
    AddHandler workbook.InvalidFormatException, AddressOf Workbook_InvalidFormatException

    workbook.LoadDocument("Documents\encrypted.xlsx")
End Sub

Private Shared Sub Workbook_EncryptedFilePasswordRequest(ByVal sender As Object, ByVal e As EncryptedFilePasswordRequestEventArgs)
    'Prompt the user to enter the password
    Console.WriteLine("Enter password:")
    e.Password = Console.ReadLine()
    e.Handled = True
    IsValid = True
End Sub

Private Shared Sub Workbook_EncryptedFilePasswordCheckFailed(ByVal sender As Object, ByVal e As EncryptedFilePasswordCheckFailedEventArgs)
    'Analyze the password error:
    Select Case e.Error

        'If the password is empty, raise the request again
        Case SpreadsheetDecryptionError.PasswordRequired
            Console.WriteLine("You did not enter the password!")
            e.TryAgain = True
            e.Handled = True

        'If the password is invalid, ask user whether to continue the operation:
        Case SpreadsheetDecryptionError.WrongPassword
            Console.WriteLine("The password is incorrect. Try Again? (y/n)")
            Dim answer As String = Console.ReadLine()?.ToLower()
            If answer = "y" Then
                e.TryAgain = True
                e.Handled = True

            'If user cancels the operation, show an exception message:
            Else
                IsValid = False
            End If
    End Select

    Program.IsValid = False
End Sub

Private Shared Sub Workbook_InvalidFormatException(ByVal sender As Object, ByVal e As SpreadsheetInvalidFormatExceptionEventArgs)
    Console.WriteLine(e.Exception.Message.ToString() & " Press any key to close...")
    Console.ReadKey(True)
End Sub