[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use SortedSearchAsync instead.")]
public IAsyncResult BeginSortedSearch(
	bool returnUids,
	string searchCondition,
	string charset,
	string orderBy,
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use SortedSearchAsync instead.")>
Public Function BeginSortedSearch ( 
	returnUids As Boolean,
	searchCondition As String,
	charset As String,
	orderBy As String,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

using System;
using MailBee;
using MailBee.ImapMail;

class Sample
{
    // A callback function.
    private static void SortedSearchCallback(IAsyncResult result)
    {
        // Extract values from state object.
        Imap imp = (Imap)((object [])result.AsyncState)[0];
        bool sortAvail = (bool)((object [])result.AsyncState)[1];

        // Display the outcome.
        Console.WriteLine("SORT capability is " + (!sortAvail ? "NOT " : "") + "available");
        try
        {
            Console.WriteLine("UIDs found: " + ((UidCollection)imp.EndSortedSearch()).ToString());
        }
        catch (Exception e)
        {
            // Catching exception here is recommended. Because callback function is a separate
            // thread, unhandled exception would silently terminate it without any message to
            // the user (and it would be hard to understand what exactly happened).
            Console.WriteLine("Exception occurred: " + e.Message);
            Console.WriteLine(e.StackTrace);
        }
    }

    // The actual code.
    static void Main(string[] args)
    {
        Imap imp = new Imap();

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

        // Set to true if SORT extension is available.
        bool sortAvail = (imp.GetExtension("SORT") != null);

        // If SORT is supported, order messages by SUBJECT field. If SORT is not supported,
        // orderBy criteria will not be set and SortedSearch will downgrade to the regular Search.
        string orderByCriteria = sortAvail ? "SUBJECT" : null;

        // Initiate an asynchronous request for getting UIDs of messages received since yesterday,
        // sorted accordingly orderByCriteria.
        IAsyncResult ar = imp.BeginSortedSearch(true,
            "SINCE \"" + ImapUtils.GetImapDateString(DateTime.Today.AddDays(-1)) + "\"",
            null, orderByCriteria,
            new AsyncCallback(SortedSearchCallback), new object[] {imp, sortAvail});

        // Simulate some lengthy work here. At the same time,
        // folder selection is executed on another thread.
        System.Threading.Thread.Sleep(3000);

        // If the folder selection attempt is still in progress,
        // then wait until it's finished.
        while (imp.IsBusy) ar.AsyncWaitHandle.WaitOne();

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