Send Emails With Attachment in ASP.NET

Introduction

Send emails using Simple Mail Transfer Protocol (SMTP) with attachments.

Requirement

Namespace: using System.Net.Mail;

Source code

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Send Mail using asp.net</title>
<style type="text/css">
.auto-style1 {
color: #FFFFFF;
font-weight: bold;
background-color: #3399FF;
}
.auto-style2 {
background-color: #3399FF;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="border-style: solid; border-color: inherit; border-width: 1px; background-color: #49A3FE;" align="center">
<tr>
<td colspan="2" align="center" class="auto-style1">Send Mail with Attachment using asp.net
</td>
</tr>
<tr>
<td class="auto-style1">From:
</td>
<td>
<asp:TextBox ID="txt_from" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style1">To:
</td>
<td>
<asp:TextBox ID="txtTo" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style1">Subject:
</td>
<td>
<asp:TextBox ID="txtSubject" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style1">Attach a file:
</td>
<td>
<asp:FileUpload ID="fileUpload1" runat="server" />
</td>
</tr>
<tr>
<td valign="top" class="auto-style1">Body:
</td>
<td>
<asp:TextBox ID="txtBody" runat="server" TextMode="MultiLine" Columns="30" Rows="10"></asp:TextBox>
</td>
</tr>
<tr>
<td class="auto-style2"></td>
<td>
<asp:Button ID="btnSubmit" Text="Send" runat="server" OnClick="btnSubmit_Click" Style="height: 26px" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

Design

Code behind

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
MailMessage mail = new MailMessage();
mail.To.Add(txtTo.Text);
//mail.To.Add
mail.From = new MailAddress(txt_from.Text);
mail.Subject = txtSubject.Text;
mail.Body = txtBody.Text;
mail.IsBodyHtml = true;
//Attach file using FileUpload Control and put the file in memory stream
if (fileUpload1.HasFile)
{
mail.Attachments.Add(new Attachment(fileUpload1.PostedFile.InputStream, fileUpload1.FileName));
}
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential
("your email id", "your password");
//Or your Smtp Email ID and Password
smtp.EnableSsl = true;
smtp.Send(mail);
}
}

Run

Press "Ctrl + S" or save all the work then click "F5" to run the page. The page looks as in the following images:

Using this form you can send emails with attachments.