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Send mail using System.Web.Mail namespace

By , 23 Apr 2013
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Introduction

The System.Web.Mail namespace provides the classes for sending email in .NET. This tutorial explains how to send emails with attachments.

Class: MailMessage manages the mail message contents.

Properties
  • Attachment specifies the list of the attachments that are transmitted with the message.
  • Bcc is a list of semicolon delimited email addresses that receive a Blind Carbon Copy of the message.
  • Body contains the message text that has to be sent.
  • BodyEncoding is the encoding type of the email message.
  • BodyFormat defines the content type of the body of the message.
  • Cc is a list of semicolon delimited email addresses that receive a Carbon Copy of the message.
  • From is the email address of the sender.
  • Header specifies the custom headers which are transmitted with the Message.
  • Priority is the priority of the email message.
  • Subject is the subject line of the email message.
  • To is the email address of the recipient.

Class: MailAttachments manages the mail attachment.

Class: SmtpMail sends email to the mail server.

The code

Let us see it step by step:

Create a Visual Basic .NET application and drop the following controls and set the properties accordingly.

Control Property
Label Text SMTP Server
TextBox Name txtSMTPServer
Label Text From
TextBox Name txtFrom
Label Text From Display Name
TextBox Name txtFromDisplayName
Label Text Recipient
TextBox txtTo
Label Text Attachment
ListBox Name lstAttachment
Label Text Subject
TextBox Name txtSubject
Label Text Message
TextBox Name txtMessage
Multiline True
Scrollbars Both
Button Text Add attachment
Name BtnAdd
Button Text Remove attachment
Name btnRemove
Button Text Send
Name btnSend
CheckBox Text Send As HTML
Name chkFormat
OpenFileDialog Name OFD
DefaultExt *.*
InitialDirectory c:\
Multiselect True

Now let us see the coding part

Invoke the code window and type the following statement above the class declaration.

Imports System.Web.Mail

Within the Class declaration, in the general section, declare variables required for this project.

' Variable which will send the mail
Dim obj As System.Web.Mail.SmtpMail

'Variable to store the attachments 
Dim Attachment As System.Web.Mail.MailAttachment 

'Variable to create the message to send
Dim Mailmsg As New System.Web.Mail.MailMessage()

Double click on the "Add attachment" button to add the code. Type the following lines:

'Show open dialogue box to select the files to attach

Dim Counter As Integer
OFD.CheckFileExists = True
OFD.Title = "Select file(s) to attach"
OFD.ShowDialog()

For Counter = 0 To UBound(OFD.FileNames)
   lstAttachment.Items.Add(OFD.FileNames(Counter))
Next

Double click on the "Remove attachment" button. Type the following lines:

'Remove the attachments
If lstAttachment.SelectedIndex > -1 Then
    lstAttachment.Items.RemoveAt(lstAttachment.SelectedIndex)
End If

Double click on the "Send" button. Type the following lines:

Dim Counter As Integer

'Validate the data
If txtSMTPServer.Text = "" Then
  MsgBox("Enter the SMTP server info ...!!!", _
           MsgBoxStyle.Information, "Send Email")
  Exit Sub
End If

If txtFrom.Text = "" Then
  MsgBox("Enter the From email address ...!!!", _
           MsgBoxStyle.Information, "Send Email")
  Exit Sub
End If

If txtTo.Text = "" Then
  MsgBox("Enter the Recipient email address ...!!!", _
           MsgBoxStyle.Information, "Send Email")
  Exit Sub
End If

If txtSubject.Text = "" Then
  MsgBox("Enter the Email subject ...!!!", _
           MsgBoxStyle.Information, "Send Email")
  Exit Sub
End If

'Set the properties
'Assign the SMTP server
obj.SmtpServer = txtSMTPServer.Text

'Multiple recepients can be specified using ; as the delimeter
'Address of the recipient
Mailmsg.To = txtTo.Text

'Your From Address
'You can also use a custom header Reply-To for a different replyto address
Mailmsg.From = "\" & txtFromDisplayName.Text & "\ <" & txtFrom.Text & ">"

'Specify the body format
If chkFormat.Checked = True Then
  Mailmsg.BodyFormat = MailFormat.Html 'Send the mail in HTML Format
Else
  Mailmsg.BodyFormat = MailFormat.Text
End If

'If you want you can add a reply to header 
'Mailmsg.Headers.Add("Reply-To", "testmail@mail.com")
'custom headersare added like this
'Mailmsg.Headers.Add("Manoj", "TestHeader")

'Mail Subject
Mailmsg.Subject = txtSubject.Text

'Attach the files one by one
For Counter = 0 To lstAttachment.Items.Count - 1
  Attachment = New MailAttachment(lstAttachment.Items(Counter))
  'Add it to the mail message
  Mailmsg.Attachments.Add(Attachment)
Next

'Mail Body
Mailmsg.Body = txtMessage.Text

'Call the send method to send the mail
obj.Send(Mailmsg)

This application is now ready to run, try it. 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

ManojRajan
Web Developer
United States United States
I'm ManojRajan, Working as a consultant architect in Tennessee. I have more than 8 years of experience in Microsoft Technologies.

Comments and Discussions

 
GeneralMy vote of 1 PinmemberVasudevan Deepak Kumar23-Apr-13 4:14 
GeneralRe: My vote of 1 PinmemberManojRajan17-Jul-13 6:13 
GeneralRe: My vote of 1 PinmemberVasudevan Deepak Kumar22-Jul-13 16:03 
GeneralRe: My vote of 1 [modified] PinmemberManojRajan22-Jul-13 16:20 
Generalsending email via .net web site code PinmemberParth201227-Feb-11 23:24 
GeneralPlz help! Not able to fix this error Pinmembernimi_201013-Dec-10 17:05 
GeneralError of Sending email PinmemberMember 75740806-Nov-10 2:50 
GeneralUrgent help needed on this article [modified] PinmemberAdeyemi27-Jul-09 1:28 
GeneralSending emails without IIS PinmemberMember 37199509-Jun-09 21:23 
General2 things need to discuss Pinmemberel3ashe230-May-09 0:41 
QuestionError while running the code PinmemberBhuvan941123-Apr-09 22:44 
AnswerRe: Error while running the code Pinmemberel3ashe230-May-09 0:42 
QuestionTwo errors found.. Pinmembervinayweb31-Oct-08 2:13 
AnswerRe: Two errors found.. PinmemberMember 363240315-Dec-08 11:40 
GeneralPocket Pc mail Pinmemberserkan312324-Jun-07 22:19 
GeneralImports System.Web.mail is not available in the namespace PinmemberSelvanPPK22-Jun-07 23:17 
GeneralRe: Imports System.Web.mail is not available in the namespace Pinmemberhevesir29-Jul-07 22:25 
GeneralThanks! Pinmembermorry809-May-07 20:16 
Generalhi Pinmemberhebry18-Mar-07 23:51 
QuestionFormatting text using MailFormat.Html Pinmemberbooboo13alright9-Nov-06 7:16 
Generalif there's a solution for CDO.message problem , reply me:) Pinmembershery_bn12-Sep-06 20:12 
QuestionPlease help me! Pinmembertuonginfo2-Sep-06 9:50 
Generali want Help... Pinmembermadhan_genn29-Jul-06 0:58 
QuestionCDO.Message Pinmemberparigi_anantha25-Jul-06 0:56 
GeneralNo errors while mailing but, no mails also Pinmemberronnienk20-May-06 21:06 

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