private void ListMessages()
    {
        lblMessage.ForeColor = Color.Green;
        lblMessage.Text = "";

        try
        {
            // initialize exchange client
            NetworkCredential credential = new NetworkCredential(txtUsername.Text, Session["Password"].ToString(), txtDomain.Text);
            Aspose.Email.Exchange.ExchangeClient client = new Aspose.Email.Exchange.ExchangeClient(txtHost.Text, credential);

            // get list of messages
            Aspose.Email.Exchange.ExchangeMailboxInfo exchangeMailboxInfo = client.GetMailboxInfo();
            Aspose.Email.Exchange.ExchangeMessageInfoCollection msgCollection = client.ListMessages(exchangeMailboxInfo.InboxUri);
            gvMessages.DataSource = msgCollection;
            gvMessages.DataBind();

            lblMessage.Text = "Successfully connected to Microsoft Exchange server.<br><hr>";
        }
        catch (Exception ex)
        {
            lblMessage.ForeColor = Color.Red;
            lblMessage.Text = "Error: " + ex.Message;
        }
    }
    protected void brnSendEmail_Click(object sender, EventArgs e)
    {
        lblMessage.Text = "";
        lblMessage.ForeColor = Color.Green;

        try
        {
            // initialize exchange client
            NetworkCredential credential = new NetworkCredential(txtUsername.Text, txtPassword.Text, txtDomain.Text);
            Aspose.Email.Exchange.ExchangeClient client = new Aspose.Email.Exchange.ExchangeClient(txtHost.Text, credential);

            // get mailbox and folders information
            Aspose.Email.Exchange.ExchangeMailboxInfo exchangeMailboxInfo = client.GetMailboxInfo();
            lblMailboxURI.Text = exchangeMailboxInfo.MailboxUri;
            lblInboxURI.Text = exchangeMailboxInfo.InboxUri;
            lblSentItemsURI.Text = exchangeMailboxInfo.SentItemsUri;
            lblDraftsURI.Text = exchangeMailboxInfo.DraftsUri;
            lblCalendarURI.Text = exchangeMailboxInfo.CalendarUri;
            lblDeletedItemsURI.Text = exchangeMailboxInfo.DeletedItemsUri;

            lblMessage.Text = "Successfully connected to Microsoft Exchange server.<br><hr>";
        }
        catch (Exception ex)
        {
            lblMessage.ForeColor = Color.Red;
            lblMessage.Text = "Error: " + ex.Message;
        }
    }