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How to use the Cdosys.dll library to send an e-mail message with attachments

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Original KB number:   310212

Summary

This article describes how to use the Collaboration Data Objects (CDO) for Windows 2000 library (Cdosys.dll) to send an e-mail message with attachments. You can send text or HTML or a Web page in the body of the e-mail message by using the local SMTP server or by using a smart host server in Microsoft Visual C#.

Note

The Cdosys.dll library is also known as CDOSYS.

More information

To use CDOSYS as described in the Summary section, follow these steps:

  1. Start Microsoft Visual Studio.

  2. On the File menu, select New, and then select Project.

  3. Under Project Types, select Visual C#, and then select Console Application under Templates. By default, Program.cs is created.

    Note

    In Microsoft Visual C# .NET 2003, Visual C# is changed to Visual C# Projects. By default, Class1.cs is created.

  4. Add a reference to the Microsoft CDO For Windows 2000 Library. To do this, follow these steps:

    1. On the Project menu, select Add Reference.

    2. On the COM tab, locate Microsoft CDO For Windows 2000 Library.

      Note

      In Visual C# .NET 2003, select Select.

    3. To accept your selections, select OK in the Add References dialog box.

      If you receive a dialog box to generate wrappers for the libraries that you selected, select Yes.

  5. In the code window, replace all the code with the following code:

    namespace CdoSys {
    using System;
    class Class1 {
        static void Main (string[] args) {
            try {
                CDO.Message oMsg = new CDO.Message ();
                CDO.IConfiguration iConfg;

                iConfg = oMsg.Configuration;

                ADODB.Fields oFields;
                oFields = iConfg.Fields;

                // Set configuration.
                ADODB.Field oField = oFields["http://schemas.microsoft.com/cdo/configuration/sendusing"];

                //TODO: To send by using the smart host, uncomment the following lines:
                //oField.Value = CDO.CdoSendUsing.cdoSendUsingPort;
                //oField = oFields["http://schemas.microsoft.com/cdo/configuration/smtpserver"];
                //oField.Value = "smarthost";

                // TODO: To send by using local SMTP service.
                //oField = oFields["http://schemas.microsoft.com/cdo/configuration/sendusing"];
                //oField.Value = 1;

                oFields.Update ();

                // Set common properties from message.

                //TODO: To send text body, uncomment the following line:
                //oMsg.TextBody = "Hello, how are you doing?";

                //TODO: To send HTML body, uncomment the following lines:
                //String sHtml;
                //sHtml = "<HTML>\n" +
                //"<HEAD>\n" +
                //"<TITLE>Sample GIF</TITLE>\n" +
                //"</HEAD>\n" +
                //"<BODY><P>\n" +
                //"<h1><Font Color=Green>Inline graphics</Font></h1>\n" +
                //"</BODY>\n" +
                //"</HTML>";
                //oMsg.HTMLBody = sHtml;

                //TOTO: To send WEb page in an e-mail, uncomment the following lines and make changes in TODO section.
                //TODO: Replace with your preferred Web page
                //oMsg.CreateMHTMLBody("http://www.microsoft.com",
                //CDO.CdoMHTMLFlags.cdoSuppressNone,
                //"", "");
                oMsg.Subject = "Test SMTP";

                //TODO: Change the To and From address to reflect your information.
                oMsg.From = "someone@example.com";
                oMsg.To = "someone@example.com";
                //ADD attachment.
                //TODO: Change the path to the file that you want to attach.
                oMsg.AddAttachment ("C:\\Hello.txt", "", "");
                oMsg.AddAttachment ("C:\\Test.doc", "", "");
                oMsg.Send ();
            } catch (Exception e) {
                Console.WriteLine ("{0} Exception caught.", e);
            }
            return;
        }
    }
}

  6. Where TODO appears in the code, modify the code as indicated.

  7. To build and run the program, press F5.

  8. Verify that the e-mail message has been both sent and received.

References

For more information about Microsoft Office development with Visual Studio, see Microsoft Office Development with Visual Studio.