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How to: Programmatically Attach Files to Outlook E-Mail Items

This example attaches a file to a new mail item and sends it to Armando Pinto. The example assumes a person named Armando Pinto exists as the recipient.

Applies to: The information in this topic applies to application-level projects for Outlook 2013 and Outlook 2010. For more information, see Features Available by Office Application and Project Type.

private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
    AddAttachment();
}

private void AddAttachment()
{
    Outlook.MailItem mail =
        this.Application.CreateItem
        (Outlook.OlItemType.olMailItem)
        as Outlook.MailItem;

    mail.Subject = "An attachment for you!";

    OpenFileDialog attachment = new OpenFileDialog();

    attachment.Title = "Select a file to send";
    attachment.ShowDialog();

    if (attachment.FileName.Length > 0)
    {
        mail.Attachments.Add(
            attachment.FileName,
            Outlook.OlAttachmentType.olByValue,
            1,
            attachment.FileName);
        mail.Recipients.Add("Armando Pinto ");
        ((Outlook._MailItem)mail).Send();
    }
}
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