Sending Bulk Email in asp.net

Bulk Emails  in ASP.NET

I have been asked zillion times that How to Send Bulk Emails using C# or VB.NET in ASP.NET.

Well, there are hundreds of tutorials all over the internet on sending bulk emails in ASP.NET using C# or VB.NET.

However, I decided to post a basic "how to" for beginners so that they can easily understand the functionality of send bulk emails in ASP.NET.

For this example I will be using Northwind Database.

Step 1:

ASPX Code:

<form id="form1" runat="server">

    <div>

        Recipient(s):<br />

    <asp:TextBox ID="txtRecipient" runat="server" Height="50px" Width="525px"

            TextMode="MultiLine"></asp:TextBox>

        <br />

        <asp:Button ID="btnRecipientFromDB" runat="server"

            onclick="btnRecipientFromDB_Click" Text="Recipient From Database" />

        <br />

        <asp:CheckBoxList ID="chklstRecipientsFromDB" runat="server" Visible="False">

        </asp:CheckBoxList><asp:Button ID="btnAddSelected" runat="server"

            Text="Add Selected" onclick="btnAddSelected_Click" Visible="False" />

       

        <br />

        Subject:<br />

    <asp:TextBox ID="txtSubject" runat="server" Height="18px" Width="522px"></asp:TextBox>

   

        <br />

        <br />

        Email Body:<br />

        <asp:TextBox ID="txtEmailBody" runat="server" Height="290px" Width="520px"

            TextMode="MultiLine"></asp:TextBox>

        <br />

        <asp:Button ID="btnSend" runat="server" onclick="btnSend_Click"

            Text="Send Email" />

   

    </div>

</form>

This is simple form containing 3 TextBoxes

1. Recipient(s)
2. Email Subject
3. Email Body

"Add Recipients from Database" button will show list of already added contacts from database as shown in image below:

Now, user has two options, either they can select multiple users from list and/or they can add recipients email address manually separated by ";"

Code Behind:
C#:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Text;

using System.Net.Mail;

namespace TestApplication

{

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

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {

                chklstRecipientsFromDB.Visible = false;

                btnAddSelected.Visible = false;

            }

        }

        protected void btnSend_Click(object sender, EventArgs e)

        {

            try

            {

                #region Direct Email to db Recipients

                //if you want to send emails directly to recipient from database, use code below

                //DataSet dsClients = GetClientDataSet();

                //if (dsClients.Tables["Users"].Rows.Count > 0)

                //{

                //    foreach (DataRow dr in dsClients.Tables["Users"].Rows)

                //    {

                //        SendEmail(dr["Email"].ToString());

                //    }

                //}

                #endregion

                char[] splitter = { ';' };

                foreach (string emailAdd in txtRecipient.Text.Split(splitter))

                {

                    SendEmail(emailAdd);

                }

            }

            catch (Exception ex)

            {

            }

        }

        protected void btnRecipientFromDB_Click(object sender, EventArgs e)

        {

            try

            {

                DataSet dsClients = GetClientDataSet();

                chklstRecipientsFromDB.DataSource = dsClients.Tables[0];

                chklstRecipientsFromDB.DataTextField = "Email";

                chklstRecipientsFromDB.DataValueField = "Email";

                chklstRecipientsFromDB.DataBind();

                chklstRecipientsFromDB.Visible = true;

                btnAddSelected.Visible = true;

                btnRecipientFromDB.Visible = false;

            }

            catch (Exception ex)

            {

            }

            finally

            {

            }

        }

        ///

        ///  Creates and returns a DataSet using Ms Access OleDBConnection and an OleDBDataAdapter

        ///

        ///

        /// A DataSet from Ms Access using an OleDBConnection and an OleDBDataAdapter

        ///

        private System.Data.DataSet GetClientDataSet()

        {

            //retrieve the connection string from the ConnectionString Key in Web.Config

            //string connectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

            string connectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Talha\Documents\Database2.accdb;Persist Security Info=False;";

            //create a new OleDB connection

            System.Data.OleDb.OleDbConnection conn = newSystem.Data.OleDb.OleDbConnection(connectionString);

            //pass the Select statement and connection information to the initializxation constructor for the OleDBDataAdapter

            System.Data.OleDb.OleDbDataAdapter myDataAdapter = newSystem.Data.OleDb.OleDbDataAdapter("SELECT Email FROM Employees", conn);

            //Create a new dataset with a table : CLIENTS

            System.Data.DataSet myDataSet = new System.Data.DataSet("Users");

            //Fill the dataset and table with the data retrieved by the select command

            myDataAdapter.Fill(myDataSet, "Users");

            //return the new dataset created

            return myDataSet;

        }

        private void SendEmail(string EmailAddress)

        {

            //Send Email Functionality here

            MailMessage mail = new MailMessage();

            mail.To.Add(EmailAddress);

            mail.From = new MailAddress("admin@codeshode.com");

            mail.Subject = txtSubject.Text;

            mail.Body = txtEmailBody.Text;

            mail.IsBodyHtml = true;

            SmtpClient smtp = new SmtpClient();

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

            smtp.Credentials = new System.Net.NetworkCredential("YourUserName@gmail.com","YourGmailPassword");//Or your Smtp Email ID and Password

            smtp.EnableSsl = true;

            smtp.Send(mail);

        }

        protected void btnAddSelected_Click(object sender, EventArgs e)

        {

            StringBuilder strRecipientEmails = new StringBuilder();

            foreach (ListItem chk in chklstRecipientsFromDB.Items)

            {

                if (chk.Selected)

                {

                    strRecipientEmails.Append(chk.Value);

                    strRecipientEmails.Append(";");

                }

            }

            txtRecipient.Text = strRecipientEmails.ToString();

            chklstRecipientsFromDB.Visible = false;

            btnAddSelected.Visible = false;

        }

    }

}