Send email in background thread in C# aps.net

How to send email in a new thread in asp.net by using Gmail account or any other account or you can say a page where we can test out all the settings like SMTP Server, Email From, Email To, Email Password, Port Number, Email DeliveryMethod or Secure Socket etc.

In this article we will see how to send email in background thread with CCed and BCCed functionality.

Here is the page design:

And here is the page HTML, it very simple so no need to discuss, setting part is to set our SMTP Server and lover part is to compose the email with carbon copy and blink carbon copy, you can also set the priority of the email:

<asp:UpdatePanel ID="upnlMain" runat="server">
 <ContentTemplate>
  <fieldset style="display:inline">
    <legend>Settings</legend>
    <table style="border:none" cellspacing="7px">
       <tr>
         <td style="width:100px">Email From</td>
         <td><asp:TextBox ID="txtFrom" runat="server" Width="200px" /></td>
       </tr>            
       <tr>
         <td>SMTP Server</td>
         <td><asp:TextBox ID="txtSmtpServer" runat="server" Width="200px" /></td>
       </tr>
       <tr>
         <td>Password</td>
         <td><asp:TextBox ID="txtPassword" runat="server" Width="200px" /></td>
       </tr>
       <tr>
         <td>Port</td>
         <td><asp:TextBox ID="txtPort" runat="server" Width="30px" /></td>
       </tr>
    </table>
  </fieldset>
  <fieldset style="display:inline">
    <legend>Send Email</legend>
    <table style="border:none" cellspacing="7px">
     <tr>
       <td style="width:100px">Email To</td>
       <td><asp:TextBox ID="txtTo" runat="server" Width="300px" /></td>
     </tr>
     <tr>
        <td>CC To</td>
        <td><asp:TextBox ID="txtCC" runat="server" Width="300px"  
            placeholder="Separate email by ;" /></td>
     </tr>
     <tr>
       <td>BCC To</td>
       <td><asp:TextBox ID="txtBCC" runat="server" Width="300px" 
            placeholder="Separate email by ;" /></td>
     </tr>
     <tr>
       <td>Subject</td>
       <td><asp:TextBox ID="txtSubject" runat="server" Width="300px" /></td>
     </tr>
     <tr>
       <td>&nbsp;</td>
       <td><asp:CheckBox ID="chkPriority" runat="server" 
            Text="High Priority?" /></td>
     </tr>
     <tr>
        <td colspan="2">
          <div>Email Body</div>
          <asp:TextBox ID="txtBody" runat="server" TextMode="MultiLine"
           Rows="7" Columns="60" />
        </td>
     </tr>
     <tr>
        <td>
            <asp:Button ID="btnSend" runat="server" Text="  Send  " 
                onclick="btnSend_Click" />
        </td>
        <td>
            <asp:Button ID="ntnCancel" runat="server" Text="Cancel" />
        </td>
    </tr>
 </table>
 <div style="color:Red">
    <asp:Literal ID="ltMessage" runat="server" 
        EnableViewState="false" />
</div>
</fieldset>  
 </ContentTemplate>
</asp:UpdatePanel>

Now we will write code to send email, so create a method SendEmail and write all the code here to send an email:

public void SendEmail(Object mailMsg)
{
  MailMessage mailMessage = (MailMessage)mailMsg;
  try
  {
    /* Setting should be kept somewhere so no need to 
       pass as a parameter (might be in web.config)       */
    SmtpClient smtpClient = new SmtpClient(txtSmtpServer.Text);
    NetworkCredential networkCredential = new NetworkCredential();
    networkCredential.UserName = mailMessage.From.ToString();
    networkCredential.Password = txtPassword.Text;
    smtpClient.Credentials = networkCredential;
    if (!String.IsNullOrEmpty(txtPort.Text))
      smtpClient.Port = Convert.ToInt32(txtPort.Text);

    //If you are using gmail account then
    smtpClient.EnableSsl = true;

    smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;

    smtpClient.Send(mailMessage);
  }
  catch (SmtpException ex)
  {
    // Code to Log error
  }
}

So how it will send the email in background thread, so write a method to send call the above method in a new background thread

public void SendEmailInBackgroundThread(MailMessage mailMessage)
{
  Thread bgThread = new Thread(new ParameterizedThreadStart(SendEmail));
  bgThread.IsBackground = true;           
  bgThread.Start(mailMessage);
}

Here is our click send button click event

protected void btnSend_Click(object sender, EventArgs e)
{
  MailMessage mailMsg = new MailMessage();
  mailMsg.Subject = txtSubject.Text;
  mailMsg.Body = txtBody.Text;
  mailMsg.To.Add(new MailAddress(txtTo.Text));
  mailMsg.From = new MailAddress(txtFrom.Text);

  if (!String.IsNullOrEmpty(txtCC.Text))
  {
    String[] arrBCC = txtCC.Text.Split(';');
    for (int i = 0; i < arrBCC.Length; i++)
      if (!String.IsNullOrEmpty(arrBCC[i]))
        mailMsg.Bcc.Add(new MailAddress(arrBCC[i]));
  }

  if (!String.IsNullOrEmpty(txtBCC.Text))
  {
    String[] arrBCC = txtBCC.Text.Split(';');
    for (int i = 0; i < arrBCC.Length; i++)
      if (!String.IsNullOrEmpty(arrBCC[i]))
         mailMsg.Bcc.Add(new MailAddress(arrBCC[i]));
  }

  mailMsg.IsBodyHtml = true;
  mailMsg.Priority = chkPriority.Checked ? MailPriority.High : MailPriority.Normal;

  SendEmailInBackgroundThread(mailMsg);
}

That’s it, if you want to check, download the code and test it yourself!

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