Sending Emails Using ASP.NET

**richyrich** · richyrich, March 23rd, 2008 07:20 AM

This code sample is to show how to send emails in ASP.NET. Obviously there's lots more you can do, such as add attachments, read receipts etc. I'll add different code samples for these type of events.

Main Page

Code:

<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN""http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="XHTML namespace">
<head runat="server">
<title>Sending Email using ASP.Net</title>
</head>
<body>
<form id="form1" runat="server">
<asp:Label ID="lbl_response" runat="server"/><br/>
<br/>
To:
<asp:TextBox ID="txt_to" runat="server"/><br/>
cc:
<asp:TextBox ID="txt_cc" runat="server"/><br/>
bcc:
<asp:TextBox ID="txt_bcc" runat="server"/><br/>
Subject:
<asp:TextBox ID="txt_subject" runat="server"/><br/>
<br/>
Message:<br/>
<asp:TextBox ID="txt_mess" runat="server" TextMode="MultiLine"/><br/>
<br/>
<asp:Button ID="but_send" runat="server" Text="Send"/>
</form>
</body>
</html>

Code Behind

Code:

'import the net.mail namespace
Imports System.Net.Mail
 
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub but_send_Click(ByVal sender AsObject, ByVal e As System.EventArgs) Handles but_send.Click
 
'create smtp instance
Dim smtp As New SmtpClient
 
'set the delivery method. We're using an external smtp server
smtp.DeliveryMethod = SmtpDeliveryMethod.Network
 
'set the port the smtp server allows access on
smtp.Port = 25
 
'set the name of the smtp server to use
smtp.Host = "smtp.domain.com"
 
'create mail message instance
Dim myMail As New MailMessage()
 
'stringbuilder for building message body
Dim mail_body As New StringBuilder
 
'create html email body
mail_body.Append("<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">")
mail_body.Append("<html>")
mail_body.Append("<head>")
mail_body.Append("<title>Send Email</title>")
mail_body.Append("<style type=""text/css"">")
mail_body.Append(".dblue8 { font-family:arial; color: #000066; font-size: 8pt }")
mail_body.Append("</style>")
mail_body.Append("</head>")
mail_body.Append("<body class=""dblue8"">")
'add in text from message box as the body
mail_body.Append(txt_mess.Text)
mail_body.Append("</body>")
mail_body.Append("</html>")
 
'create a variable to hold any error message
Dim err_mess As String = String.Empty
 
'create a try...catch area for creating the email and catching any errors
 Try
 
    'create instance of a mail address for the To address
    Dim mail_to As MailAddress
 
    'for multiple email addresses, split the email address by ;
    Dim arr_email As Array = Split(txt_to.Text, ";")
    'create a temp string to hold each email address in the to box
    Dim email_to As String
 
    'iterate through all the email addresses in the email array
         For Each email_to In arr_email
 
             'convert txt_to email to a mail address and set to variable
             mail_to = New MailAddress(Trim(email_to))
             'add the mail address to the .to property of the mail message
             myMail.To.Add(mail_to)
 
         Next
 
     'check if cc text box is empty
         If Not txt_cc.Text = String.Empty Then
             'txt_cc is not empty so need to add cc email addresses to cc property
             'create instance of a mail address for the cc address
             Dim mail_cc As MailAddress
             'for multiple email addresses, split the cc email addresses by ;
             'can use the same array instance as we used for the to addresses
             arr_email = Split(txt_cc.Text, ";")
             'create a temp string to hold each email address in the cc box
             Dim email_cc As String
             'iterate through all the email addresses in the email array
                  For Each email_cc In arr_email
                        'convert txt_to email to a mail address and set to variable
                        mail_cc = New MailAddress(Trim(email_cc))
                        'add the mail address to the .cc property of the mail message
                        myMail.CC.Add(mail_cc)
                  Next
         End If
 
     'check if bcc text box is empty
         If Not txt_bcc.Text = String.Empty Then
             'txt_bcc is not empty so need to add bcc email addresses to bcc property
             'create instance of a mail address for the bcc address
             Dim mail_bcc As MailAddress
             'for multiple email addresses, split the bcc email addresses by ;
             'can use the same array instance as we used for the to addresses
             arr_email = Split(txt_bcc.Text, ";")
             'create a temp string to hold each email address in the bcc box
             Dim email_bcc As String
             'iterate through all the email addresses in the email array
                 For Each email_bcc In arr_email
                     'convert txt_to email to a mail address and set to variable
                     mail_bcc = New MailAddress(Trim(email_bcc))
                     'add the mail address to the .bcc property of the mail message
                     myMail.Bcc.Add(mail_bcc)
                 Next
          End If
 
    'add your email as the .from property of the mail message
    myMail.From = New MailAddress("youremail@domain.com")
 
    'set the .subject property of the mail message to the value in the txt_subject box
    myMail.Subject = txt_subject.Text
 
    'set the body of the email to HTML. Set to False if you want Plain Text
    myMail.IsBodyHtml = True
 
    'set the .body property of the mail message to the email we created above
    myMail.Body = mail_body.ToString
 
    'send the email
    smtp.Send(myMail)
 
 Catch ex As Exception
         err_mess = ex.Message.ToString
 
 Finally
         myMail.Dispose()
 
 End Try
 
 If err_mess = String.Empty Then
          lbl_response.Text = "Your email has been sent"
 Else
          lbl_response.Text = err_mess
 End If
 
End Sub
 
End Class

**micky** · micky, July 4th, 2009 07:43 AM

Hey RR
Have you checked this code when you have more than 1 email address in TO field?

I did and it shows all email addresses in TO field.
I thought it happened with Async method only.

Any pointers??

**richyrich** · richyrich, July 4th, 2009 09:08 AM

Originally Posted by micky

Hey RR
Have you checked this code when you have more than 1 email address in TO field?

I did and it shows all email addresses in TO field.
I thought it happened with Async method only.

Any pointers??

This particular code sample adds them all to the To: field...

**micky** · micky, July 6th, 2009 03:21 AM

Originally Posted by richyrich

This particular code sample adds them all to the To: field...

ok, let me see if i can send them separately!

**richyrich** · richyrich, July 6th, 2009 04:07 AM

I think it was my own confusion micky....I think some original code I had in classic ASP sent an email to each person, but when I wrote the .NET code, I sent the same email to everyone...

**micky** · micky, July 6th, 2009 04:21 AM

Actually RR, i think this system.net.mail component behaves nonsensely
If i use such code

Code:

        Dim arr_email_to As Array = Split(emails, ";")
        Dim SmtpMail As New SmtpClient(ConfigurationManager.AppSettings("SmtpServer"), 25)
        Dim myMail As New MailMessage()

        myMail.From = New MailAddress(ConfigurationManager.AppSettings("NoReply"))
        myMail.Body = "Update"
        myMail.Subject = "Update"

        For Each email_to As String In arr_email_to

            myMail.To.Add(New MailAddress(email_to))
            SmtpMail.Send(myMail)
        Next

It sends different number of mails and with different number of emails in TO field.

When i do this, then it sends correct mails.
But i wonder if its a good way, as i have to define everything every time in loop.

Code:

        Dim arr_email_to As Array = Split(emails, ";")

        For Each email_to As String In arr_email_to
            Dim SmtpMail As New SmtpClient(ConfigurationManager.AppSettings("SmtpServer"), 25)
            Dim myMail As New MailMessage()

            myMail.From = New MailAddress(ConfigurationManager.AppSettings("NoReply"))
            myMail.Body = "Update for your match"
            myMail.Subject = "Match Update"

            myMail.To.Add(New MailAddress(email_to))
            SmtpMail.Send(myMail)
        Next

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