Send Email In ASP .Net :

Namespaces used :

using System.Net.Mail

using System.Net.Mime;

WithOut Image

MailMessage mail = new MailMessage();

mail.To.Add("xyz@gmail.com");

mail.From = new MailAddress("abc@gmail.com");

mail.Subject = "Your text for subject";

string Body = "Hi, this mail is to test sending mail" +

"using Gmail in ASP.NET";

mail.Body = Body;

mail.IsBodyHtml = true;

SmtpClient smtp = new SmtpClient();

smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address

smtp.Credentials = new System.Net.NetworkCredential

 ("abc@gmail.com", "xxxxxx");  //  ("YourGmailID@gmail.com", "YourGmailPassword");

smtp.EnableSsl = true;

smtp.Send(mail);

With Image:

MailMessage mail = new MailMessage();

mail.To.Add("xyz@gmail.com");

mail.From = new MailAddress("abc@gmail.com");

mail.Subject = "Test with Image";

string Body = "<b>Welcome to send mail with image demo!!</b><br<img alt=\"\" hspace=0 src=\"cid:imageId\" align=baseline border=0 >";

AlternateView htmlView = AlternateView.CreateAlternateViewFromString(Body, null, "text/html");

LinkedResource imagelink = new LinkedResource(Server.MapPath(".") + @"\ss.jpg", "image/png");

imagelink.ContentId = "imageId";

imagelink.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;

htmlView.LinkedResources.Add(imagelink);

mail.AlternateViews.Add(htmlView);

SmtpClient smtp = new SmtpClient();

smtp.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

smtp.Send(mail);

optional:

 Note:SmtpClient mailSender = new SmtpClient(ConfigurationManager.AppSettings["MyCustomId"]); // use this in the Production Server. I have specified my email server in the web.config file

Web.Config

  <appSettings>

    <add key="SMTP" value="smtp.gmail.com"/>

    <add key="FROMEMAIL" value="xxx@gmail.com"/>

    <add key="FROMPWD" value=""/>   

  </appSettings>

With Attachment:

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Net.Mail;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void btnSend_Click(object sender, EventArgs e)

    {

        MailMessage mail = new MailMessage();

        mail.To.Add(txtTo.Text);

        mail.From = new MailAddress(txtFrom.Text);

        mail.Subject = txtSubject.Text;

        mail.Body = txtMessage.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

             ("YourGmailID@gmail.com", "YourGmailPassword");

        //Or your Smtp Email ID and Password

        smtp.EnableSsl = true;

        smtp.Send(mail);

    }

}