Send Email To Multiple Email Addresses With Inline Image Using ASP.NET With C#

Rajeesh Menoth
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Article

Introduction

In this article I will explain how to send multiple emails with Inline Image. Before reading this article you must read my previous email related article because I have explained some basics part in my previous article and changed few of the code part in new one. The following are my previous articles.

Code

protected void btn_sendemail_Click(object sender, EventArgs e)
{
string to = Txt_toaddress.Text; //To address
string from = "fromaddress email"; //From address
string[] Multiple = to.Split(',');
MailMessage message = new MailMessage();
message.From = new MailAddress(from);
foreach (string multiple_email in Multiple)
{
message.To.Add(new MailAddress(multiple_email));
}
string mailbody = Txt_Bodycontent.Text + "<br/><html><body><h1>Happy Coding</h1><br> <img src=\"cid:Email\" width='600' height='300'></body></html>";
AlternateView AlternateView_Html = AlternateView.CreateAlternateViewFromString(mailbody, null, MediaTypeNames.Text.Html);
// Create a LinkedResource object and set Image location path and Type
LinkedResource Picture1 = new LinkedResource(Server.MapPath("Selfie.jpeg"), MediaTypeNames.Image.Jpeg);
Picture1.ContentId = "Email";
AlternateView_Html.LinkedResources.Add(Picture1);
message.AlternateViews.Add(AlternateView_Html);
message.Subject = Txt_Subject.Text;
message.Body = mailbody;
message.BodyEncoding = Encoding.UTF8;
message.IsBodyHtml = true;
SmtpClient client = new SmtpClient("smtp.gmail.com", 587); //Gmail smtp
System.Net.NetworkCredential basicCredential1 = new
System.Net.NetworkCredential("fromaddress email", "fromaddress password");
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = basicCredential1;
try
{
client.Send(message);
}
catch (Exception ex)
{
throw ex;
}
}

We must add the following namespace:

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

Multiple Email

The following code will help to split the Comma '"," separated email in the given textbox ( Txt_toaddress.Text ).

string to = Txt_toaddress.Text; //To address
string from = "fromaddress email"; //From address
string[] Multiple = to.Split(',');
MailMessage message = new MailMessage();
message.From = new MailAddress(from);
foreach (string multiple_email in Multiple)
{
message.To.Add(new MailAddress(multiple_email));
}

Inline Image Code

The following code will help to fetch the image and set into the inline of the email body.

string mailbody = Txt_Bodycontent.Text + "<br/><html><body><h1>Happy Coding</h1><br><img src=\"cid:Email\" width='600' height='300'></body></html>";
AlternateView AlternateView_Html = AlternateView.CreateAlternateViewFromString(mailbody, null, MediaTypeNames.Text.Html);
// Create a LinkedResource object and set Image location path and Type
LinkedResource Picture1 = new LinkedResource(Server.MapPath("Selfie.jpeg"), MediaTypeNames.Image.Jpeg);
Picture1.ContentId = "Email";
AlternateView_Html.LinkedResources.Add(Picture1);
message.AlternateViews.Add(AlternateView_Html);
message.Body = mailbody;

Important Notes

Firstly, create one string that contain the html body with Inline image. In the above code "mailbody" is the string. It contains the html body.
Create an AlternateView object for those supporting the HTML content.
System.Net.Mime namespace contain the Image type and html format ( MediaTypeNames.Image.Jpeg & MediaTypeNames.Text.Html ).
Create a LinkedResource object for the Inline image to send.
Add a LinkedResource object to the AlternateView object.
Check the correct Image location otherwise it will throw an error.
Give same Image source id and LinkedResource ContentId.Like "<img src=\"cid:Email\" width='600' height='300'>" & Picture1.ContentId = "Email";