How to add attachments to mailto in c#? <pre><code>string email ="sample@gmail.com"; attachment = path + "/" + filename; Application.OpenURL ("mailto:" + email+" ?subject=EmailSubject&amp;body=EmailBody"+"&amp;attachment="+attachment); </code></pre> <p>In the above code, <code>attachment</code> isn't working. Is there any other alternative to add attachments using a mailto: link in C#?</p>