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How to use the Cdosys.dll library to send an e-mail message with attachments by using Visual C#

This article was previously published under Q310212
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.
To use CDOSYS as described in the "Summary" section, follow these steps:
  1. Start Microsoft Visual Studio.
  2. On the File menu, click New, and then click Project.
  3. Under Project Types, click Visual C#, and then click 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, click Add Reference.
    2. On the COM tab, locate Microsoft CDO For Windows 2000 Library.

      Note In Visual C# .NET 2003, click Select.
    3. To accept your selections, click OK in the Add References dialog box.

      If you receive a dialog box to generate wrappers for the libraries that you selected, click 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[""];                        				//TODO: To send by using the smart host, uncomment the following lines:				//oField.Value = CDO.CdoSendUsing.cdoSendUsingPort;				//oField = oFields[""];				//oField.Value = "smarthost";				// TODO: To send by using local SMTP service. 				//oField = oFields[""];				//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("",				//	CDO.CdoMHTMLFlags.cdoSuppressNone, 				//	"", ""); 				oMsg.Subject = "Test SMTP";  				//TODO: Change the To and From address to reflect your information.                       				oMsg.From = "";				oMsg.To = "";				//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.
For more information about Microsoft Office development with Visual Studio, see the following Microsoft Developer Network (MSDN) Web site:For additional information about how to use CDOSYS, click the following article numbers to view the articles in the Microsoft Knowledge Base:
310221 How to use the Cdosys.dll library to embed a message in a new message by using Visual C# .NET
310224 How to use the Cdosys.dll library to process mail in the Drop directory by using Visual C# .NET
310225 How to use the Cdosys.dll Library to save a message to a file by using Visual C# .NET
send text body html body web page email attachments e-mail

Article ID: 310212 - Last Review: 07/30/2008 22:58:16 - Revision: 4.0

  • Microsoft Visual C# 2008 Express Edition
  • Microsoft Visual C# 2005
  • Microsoft Collaboration Data Objects 2.0
  • Microsoft ActiveX Data Objects 2.5
  • Microsoft ActiveX Data Objects 2.6
  • Microsoft ActiveX Data Objects 2.7
  • Microsoft Internet Information Services 6.0
  • Microsoft Internet Information Services 5.0
  • kbsweptvs2008 kbcode kbhowto KB310212