How to Send an Email With Image in C#

Introduction

This article describes how to send an email with an image in C#. For sending the email, you need to configure the email services on the server.

Note. For more info about configuration read how to configure mail server (http://technet.microsoft.com/en-us/library/cc780996%28v=ws.10%29.aspx).

To explain this article, I will use the following procedure after configuring the server.

• Create a new website and add a page to it.
• Add 3 textboxes into the page for receiver Email-ID, subject of Email, and message of Email, and a button for sending mail.
• Write some code on the ".cs" file to send the mail with some Text and an Image at a "button click" event.

The following procedure is the details of the preceding steps.

Step 1. Create a new empty Website named "MailServer".

Step 2

• Add a new Page named "SendingMail.aspx".
  
• Add a Button with the Onclick event (for sending the email) on the page.

  <table>
      <tr>
          <td>Mail To:-</td>
          <td>
              <asp:TextBox ID="txtEmail" runat="server" Width="200px"></asp:TextBox>
          </td>
      </tr>
      <tr>
          <td>Subject:-</td>
          <td>
              <asp:TextBox ID="txtSubject" runat="server" Width="200px"></asp:TextBox>
          </td>
      </tr>
      <tr>
          <td>Message:-</td>
          <td>
              <asp:TextBox ID="txtmessagebody" runat="server" TextMode="MultiLine" Height="200px" Width="400px"></asp:TextBox>
          </td>
      </tr>
      <tr>
          <td colspan="2" align="center">
              <asp:Button ID="btn_send" runat="server" Text="Send Mail" OnClick="btn_send_Click" />
          </td>
      </tr>
  </table>
  

• Add an image named "photo.jpg" into the folder named "Images".
• Add the 4 namespaces at the top of the ".cs" file.

  using System.Net.Mail;
  using System.IO;
  using System.Text;
  using System.Net.Mime;
  

• Write the following code to send the email on the click event of the button.

  protected void btn_send_Click(object sender, EventArgs e)   
  {   
      try   
      {   
          MailMessage message = new MailMessage();   
          message.To.Add(txtEmail.Text);// Email-ID of Receiver   
          message.Subject = txtSubject.Text;// Subject of Email   
          message.From = new System.Net.Mail.MailAddress("[email protected]");// Email-ID of Sender   
          message.IsBodyHtml = true;   
          message.AlternateViews.Add(Mail_Body());   
          SmtpClient SmtpMail = new SmtpClient();   
          SmtpMail.Host = "Your Host";//name or IP-Address of Host used for SMTP transactions   
          SmtpMail.Port = 25;//Port for sending the mail   
          SmtpMail.Credentials = new System.Net.NetworkCredential("", "");//username/password of network, if apply   
          SmtpMail.DeliveryMethod = SmtpDeliveryMethod.Network;   
          SmtpMail.EnableSsl = false;   
          SmtpMail.ServicePoint.MaxIdleTime = 0;   
          SmtpMail.ServicePoint.SetTcpKeepAlive(true, 2000, 2000);   
          message.BodyEncoding = Encoding.Default;   
          message.Priority = MailPriority.High;   
          SmtpMail.Send(message); //Smtpclient to send the mail message   
          Response.Write("Email has been sent");   
      }   
      catch (Exception ex)   
      { Response.Write("Failed"); }   
  }   
  

private AlternateView Mail_Body()
{
    string path = Server.MapPath(@"Images/photo.jpg");
    LinkedResource Img = new LinkedResource(path, MediaTypeNames.Image.Jpeg);
    Img.ContentId = "MyImage";
    string str = @"
        <table>
            <tr>
                <td> '" + txtmessagebody.Text + @"' 
                </td>
            </tr>
            <tr>
                <td>
                    <img src=cid:MyImage  id='img' alt='' width='100px' height='100px'/>   
                </td>
            </tr></table>
            ";
    AlternateView AV =   
    AlternateView.CreateAlternateViewFromString(str, null, MediaTypeNames.Text.Html);
    AV.LinkedResources.Add(Img);
    return AV;
}