How to Send HTML-Formatted Email Using C#

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Muhammad Zeeshan Feb 02, 2024
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  1. Create Windows Form to Send HTML-Formatted Email Using C#
  2. Write the Code to Send HTML-Formatted Email Using C#
How to Send HTML-Formatted Email Using C#

This article will teach you how to send HTML-formatted emails using C# in ASP.Net.

Sending emails over SMTP may be tested with either your current Gmail account or a whole new account. The Gmail Mailer client can be used for communication.

Create Windows Form to Send HTML-Formatted Email Using C#

  • Add a label and textbox for User Name. This will be the sender’s username.

    Windows Form - User Name Textbox

  • Add a label and textbox for Password. It will be the sender account’s password.

    Windows Form - Password Textbox

  • Add a label and textbox for Sendto. It will be the receiver’s mail address.

    Windows Form - Sendto Textbox

  • Add a label and textbox for Subject or title.

    Windows Form - Subject Textbox

  • Lastly, create a button named Send Mail.

    Windows Form - Send Mail Button

    The complete form will look like this:

    C# Send HTML Email - Windows Form

Write the Code to Send HTML-Formatted Email Using C#

Below are the necessary steps to write the code to send HTML-formatted email using C#:

  • To begin, import the following libraries:
    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Mail;
  • Create MailMessage object and SmtpClient object.
    MailMessage mail = new MailMessage();
SmtpClient smtp = new SmtpClient("smtp.gmail.com");
  • Now, assign values of properties like sender, receiver, subject, body, etc.
    mail.To.Add(sendtotxt.Text);
mail.Subject = subjecttxt.Text;
var htmlbody = "Here your can write your html";
mail.Body = htmlbody;
smtp.Port = 587;
smtp.Credentials = new System.Net.NetworkCredential(usertxt.Text, passtxt.Text);
  • Enable SSL, and send the message.
    smtp.EnableSsl = true;
smtp.Send(mail);

Complete Source Code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Mail;

namespace EmailExample {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }

    private void sendbtn_Click(object sender, EventArgs e) {
      try {
        MailMessage mail = new MailMessage();
        SmtpClient smtp = new SmtpClient("smtp.gmail.com");
        mail.From = new MailAddress(usertxt.Text);
        mail.To.Add(sendtotxt.Text);
        mail.Subject = subjecttxt.Text;
        var htmlbody = "Here your can write your html";
        mail.Body = htmlbody;
        smtp.Port = 587;
        smtp.Credentials = new System.Net.NetworkCredential(usertxt.Text, passtxt.Text);
        smtp.EnableSsl = true;
        smtp.Send(mail);
        MessageBox.Show("Mail Sent!");
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
      }
    }
  }
}

Output:

C# Send HTML Email - Output

Author: Muhammad Zeeshan
Muhammad Zeeshan avatar Muhammad Zeeshan avatar

I have been working as a Flutter app developer for a year now. Firebase and SQLite have been crucial in the development of my android apps. I have experience with C#, Windows Form Based C#, C, Java, PHP on WampServer, and HTML/CSS on MYSQL, and I have authored articles on their theory and issue solving. I'm a senior in an undergraduate program for a bachelor's degree in Information Technology.

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