How to Send Bulk Email Using ASP.Net

Introduction

This article explains how to send bulk email using ASP.Net 4.5.

Using

• ASP .NET web page
• Grid View
• HTML Email Templates
• Gmail SMTP Mail Server

Create a new project using "File" -> "New" -> "Project..." then select web "ASP .Net Web Forms Application". Name it " Bulk Email".



Now in the Design page “Default.aspx” design the web page as in the following screen:



In the Design Source (Default.aspx) write the code as:

Default.aspx.cs

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="BulkEmail._Default" %>

<asp:Content runat="server" ID="FeaturedContent" ContentPlaceHolderID="FeaturedContent">
    <section class="featured">
        <div class="content-wrapper">
            <hgroup class="title">
                <h2>Send Bulk email using asp.net</h2>
            </hgroup>
            <p>
                To learn more about ASP.NET
            </p>
        </div>
    </section>
</asp:Content>
<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
       <h3>We suggest the following:</h3>
    <asp:Panel ID="Panel1" runat="server" Width="100%" ScrollBars="Horizontal">
    <p>
       <asp:Button ID="btnBind" runat="server" Text="View" OnClick="btnBind_Click" /> <asp:Label
ID="Label1" runat="server" Font-Bold="true" ForeColor="Green" Text="Total Customers:">
</asp:Label><asp:Label ID="lbltotalcount" runat="server" ForeColor="Red" Font
Size="Larger"></asp:Label> </p>
        <asp:Button ID="btnSend" runat="server" Text="Send" OnClick="btnSend_Click" />
        <asp:GridView ID="grvCustomers" runat="server"></asp:GridView>
    </asp:Panel>
</asp:Content>

In the Web.config file create the connection string as:

Web.config

<connectionStrings>
<add name="ConnectionString"connectionString="Server=localhost;userid=root;password=;Database=
orthwind"providerName="MySql.Data.MySqlClient"/>
</connectionStrings>

In the code behind file (Default.aspx.cs) write the code as:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

//Using namespaces
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Data;

namespace BulkEmail
{
    public partial class _Default : Page
    {
        #region MySqlConnection Connection
        MySqlConnection conn = new
MySqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

        protected void Page_Load(object sender, EventArgs e)
        {
            Try
            {
                if (!Page.IsPostBack)
                {
                }
            }
            catch (Exception ex)
            {
                ShowMessage(ex.Message);
            }
        }
        #endregion
        #region show message
        /// <summary>
        /// This function is used for show message.
        /// </summary>
        /// <param name="msg"></param>
        void ShowMessage(string msg)
        {
            ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script
language='javascript'>alert('" + msg + "');</script>");
        }
        #endregion
        #region Bind Data
        /// <summary>
        /// This display the data fetched from the table using MySQLCommand,DataSet and
MySqlDataAdapter
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnBind_Click(object sender, EventArgs e)
        {
            Try
            {
                conn.Open();
                MySqlCommand cmd = new MySqlCommand("Select
CustomerID,ContactName,Address,Phone,Email from customers", conn);
                MySqlDataAdapter adp = new MySqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                adp.Fill(ds);
                grvCustomers.DataSource = ds;
                grvCustomers.DataBind();
                lbltotalcount.Text = grvCustomers.Rows.Count.ToString();
            }
            catch (MySqlException ex)
            {
                ShowMessage(ex.Message);
            }
            Finally
            {
                conn.Close();
            }
            btnBind.Visible = false;
        }
        #endregion
        #region Bulk email,GridView,gmail
        /// <summary>
        /// this code used to Send Bulk email
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnSend_Click(object sender, EventArgs e)
        {
            Try
            {
                lbltotalcount.Text = string.Empty;
                foreach (GridViewRow grow in grvCustomers.Rows)
               {
                    string strCustomerID = grow.Cells[0].Text.Trim();
                    string strContactName = grow.Cells[1].Text.Trim();
                    string strAddress = grow.Cells[2].Text.Trim();
                    string strPhone = grow.Cells[3].Text.Trim();
                    string strEmail = grow.Cells[4].Text.Trim();
                    string filename = Server.MapPath("~/Event.html");
                    string mailbody = System.IO.File.ReadAllText(filename);
                    mailbody = mailbody.Replace("##NAME##", strContactName);
                    string to = strEmail;
                    string from = "[email protected]";
                    MailMessage message = new MailMessage(from, to);
                    message.Subject = "Auto Response Email";
                    message.Body = mailbody;
                    message.BodyEncoding = Encoding.UTF8;
                    message.IsBodyHtml = true;
                    SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
                    System.Net.NetworkCredential basicCredential = new
System.Net.NetworkCredential("[email protected]", "Password");
                    client.EnableSsl = true;
                    client.UseDefaultCredentials = true;
                    client.Credentials = basicCredential;
                    try
                    {
                        client.Send(message);
                        ShowMessage("Email Sending successfully...!" + strContactName + "  ");
                    }
                    catch (Exception ex)
                    {
                        ShowMessage(ex.Message);
                    }
                }
            }
            catch (MySqlException ex)
            {
                ShowMessage(ex.Message);
            }
            Finally
            {
                conn.Close();
            }
        }
        #endregion
    }
}

See the following screen for the Default.aspx: Total Customers data bind.

Now, see the following screen for the Default.aspx: send email waiting.



Now, show in the Message box “Email sending successfully”.



Now "Email Account Open" - > "View Email".



Now, see the following screen: 93 mails receive in the inbox and the Total Customers Email ID: 93



93 messages were received in the inbox. Bulk Sending an E-Mail Using ASP.NET 4.5 with HTML Email Templates and Gmail SMTP Mail Server. I hope this article is useful. If you have any other questions then please provide your comments below.