private void buttonSelectRecipients_Click(object sender, EventArgs e) { formSelectUsers selectUsers = new formSelectUsers(true, 0); if (selectUsers.ShowDialog() == DialogResult.OK) { hMailServer.DistributionListRecipients recipients = representedObject.Recipients; List<string> listUsers = selectUsers.GetSelectedTexts(); foreach (string address in listUsers) { hMailServer.DistributionListRecipient recipient = recipients.Add(); recipient.RecipientAddress = address; recipient.Save(); Marshal.ReleaseComObject(recipient); } Marshal.ReleaseComObject(recipients); ListRecipients(); } }