用附件撰写Outlook中的电子邮件

在我的应用程序中，我有一个要求，即如果用户点击发票编号，生成的发票声明将附加到outlook中的撰写电子邮件中。 使用下面的代码我能够发送自动电子邮件，但我需要撰写并打开Outlook窗口供用户查看和编辑内容。 不要寄。 请帮助。

public void pdfStatement(string InvoiceNumber) { InvoiceNumber = InvoiceNumber.Trim(); string mailServer = "server"; string fileName = InvoiceNumber; string filePath = Server.MapPath("~/Content/reports/"); string messageBody = "Its an automated test email, please ignore if you receive this."; CreateMessageWithAttachment(mailServer, filePath, fileName, messageBody); } public void CreateMessageWithAttachment(string mailServer, string filePath, string fileName, string messageBody) { MailMessage message = new MailMessage ( "user@domain.com", "user@domain.com", "TestEmail", messageBody); filePath = filePath + fileName + ".pdf"; // Create the file attachment for this e-mail message. Attachment attach = new Attachment(filePath); attach.Name = fileName + ".pdf"; // Add the file attachment to this e-mail message. message.Attachments.Add(attach); //Send the message. SmtpClient client = new SmtpClient(mailServer); var AuthenticationDetails = new NetworkCredential("user", "password"); client.Credentials = AuthenticationDetails; client.Send(message); }