public bool SetMessageFlags(
	string messageIndexSet,
	bool indexIsUid,
	string flags,
	MessageFlagAction action,
	bool silentMode
)

Public Function SetMessageFlags ( 
	messageIndexSet As String,
	indexIsUid As Boolean,
	flags As String,
	action As MessageFlagAction,
	silentMode As Boolean
) As Boolean

using System;
using MailBee;
using MailBee.ImapMail;

class Sample
{
    static void Main(string[] args)
    {
        Imap imp = new Imap();

        // Set where to save log file. However, we do
        // not enable logging here. We'll enable it
        // later for a single moment of setting flags.
        imp.Log.Filename = @"C:\Temp\log.txt";

        // Connect to the server, login and select inbox.
        imp.Connect("imap.somedomain.com");
        imp.Login("jdoe", "secret");
        imp.SelectFolder("INBOX");

        if (imp.MessageCount > 0)
        {
            // Enable logging into a file to track
            // the status of setting flags.
            imp.Log.Enabled = true;

            // Replace all flags of the last message with "$Spam" flag.
            // The developer can then take a look at C:\Temp\log.txt file
            // to find out if untagged "* FETCH (FLAGS)" response to
            // STORE command contains "$Spam" element. If it does, the
            // server indeed applied this flag to the message.
            imp.SetMessageFlags(imp.MessageCount.ToString(), false,
                "$Spam", MessageFlagAction.Replace, false);

            // Disable logging again. Thus, the log file will be pretty
            // small, and the developer will be able to read it easily.
            imp.Log.Enabled = false;

            // Demonstrate alternative way of analyzing FETCH responses.
            string[] flagResponses = imp.GetServerResponses("FETCH");
            foreach (string response in flagResponses)
            {
                Console.WriteLine(response);
            }
        }
        else
        {
            Console.WriteLine("The inbox is empty");
        }

        // Disconnect from the server.
        imp.Disconnect();
    }
}

Imports System
Imports MailBee
Imports MailBee.ImapMail

Module Sample
    ' The actual code.
    Sub Main()
        Dim imp As New Imap

        ' Set where to save log file. However, we do
        ' not enable logging here. We'll enable it
        ' later for a single moment of setting flags.
        imp.Log.Filename = "C:\Temp\log.txt"

        ' Connect to the server, login and select inbox.
        imp.Connect("imap.somedomain.com")
        imp.Login("jdoe", "secret")
        imp.SelectFolder("INBOX")

        If imp.MessageCount > 0 Then
            ' Enable logging into a file to track
            ' the status of setting flags.
            imp.Log.Enabled = True

            ' Replace all flags of the last message with "$Spam" flag.
            ' The developer can then take a look at C:\Temp\log.txt file
            ' to find out if untagged "* FETCH (FLAGS)" response to
            ' STORE command contains "$Spam" element. If it does, the
            ' server indeed applied this flag to the message.
            imp.SetMessageFlags(imp.MessageCount.ToString(), False, "$Spam", _
                MessageFlagAction.Replace, False)

            ' Disable logging again. Thus, the log file will be pretty
            ' small, and the developer will be able to read it easily.
            imp.Log.Enabled = False

            ' Demonstrate alternative way of analyzing FETCH responses.
            Dim flagResponses As String() = imp.GetServerResponses("FETCH")
            For Each response As String In flagResponses
                Console.WriteLine(response)
            Next
        Else
            Console.WriteLine("The inbox is empty")
        End If

        ' Disconnect from the server.
        imp.Disconnect()
    End Sub
End Module