Sending Mails with attachments using Gmail

Many times I came across the question that how can we send mails with some files as attachments and in continuation do we reaky need to buy some domain of our's to send mail or there is a domain using which we can send mails using gmail or yahoo or hotmail accounts. so the answer. So I decided to write this article which will help in solving the above quest.

Let answer First the above questions and then we will code how to send mails with attachments.
Question : Do we need our own domain to send mails?
Answer : No we do not necessarily need our own domain to send mails. Gmail
provides us free pop service and yahoo, hotmail and other mail engines charge for the service. Rather if we have our own domain that would be a benefit.
Question : Can we send files as an attachment?
Answer : Yes we can and even any extension of file can be send as attachment if server allows that as Gmail do not allow to send exe files rest you can send pdf,html,doc etc. any.
Question : Some Times our code is perfectly fine still we are not able to send mails ether we get error failed to send or could not connect to the server what may be the reasons?

Answer : The Reasons is very simple that we have some firewalls or the anti
virus installed on the system which prevents us to do so Specially Mac Fee prevents us sending the mails by blocking the port. The
Remedies is just off the antivirus for some time and then try sending the mail.

Requirements:

Development Machine Requirements

Dotnet installed on the system VS2005 or above The Downloadable version comes for VS2008
Files to attach with the mails
Anti-Virus off while debugging the application

Client Side Requirements

Dotnet Framework 2.0 or above in which the application is made
Browser to run the Application
Anti-Virus off while executing the application

Now lets start developing the application

Create a web application with the name "SendMailWithAttachment". You can even use any name of your choice I am using this for my example.
Add The Following code in the body tag of the Default.aspx page to genrate an interface for the aplication.<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="SendMailWithAttachment._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Send Mail Using Gmail Account With Attachments</title> </head> <body> <form id="Form1" method="post" runat="server">

<table borderColor="#339933" cellSpacing="0" cellPadding="4" width="55%" align="center" border="1"> <tr> <td> <table cellPadding="4" width="70%" align="center" border="0"> <tr bgColor="#339933"> <td align="center" colSpan="2"><asp:label id="lblHeader" Runat="server" Font-Bold="True">Gmail Account Details for Sending Mails</asp:label></td> </tr> <tr> <td vAlign="middle" align="right" width="40%">Username:</td> <td vAlign="middle" width="60%"> <asp:TextBox ID="txtUserName" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:TextBox> </td> </tr> <tr> <td vAlign="middle" align="right" width="40%">Password</td> <td vAlign="middle" width="60%"> <asp:TextBox ID="txtPassword" Font-Names="Verdana" Font-Size="X-Small" Width="350px" runat="server" TextMode="Password"></asp:TextBox> </td> </tr> <tr bgColor="#339933"> <td align="center" colSpan="2"><asp:label id="Label1" Runat="server" Font-Bold="True">SMTP Mail with Attachment</asp:label></td> </tr> <tr> <td vAlign="middle" align="right" width="40%">From :</td> <td vAlign="middle" width="60%"><asp:textbox id="txtSender" tabIndex="1" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td> </tr> <tr> <td vAlign="middle" align="right">To :</td> <td><asp:textbox id="txtReceiver" tabIndex="1" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td> </tr> <tr> <td vAlign="middle" align="right">Cc :</td> <td><asp:textbox id="txtCc" tabIndex="1" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td> </tr> <tr> <td vAlign="middle" align="right">Bcc :</td> <td><asp:textbox id="txtBcc" tabIndex="1" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td> </tr> <tr> <td vAlign="middle" align="right">Subject :</td> <td><asp:textbox id="txtSubject" tabIndex="2" runat="server" Font-Names="Verdana" Font-Size="X-Small" Width="350px"></asp:textbox></td> </tr> <tr> <td vAlign="middle" align="right">Format :</td> <td><asp:radiobuttonlist id="rblMailFormat" tabIndex="3" runat="server" repeatcolumns="2" repeatdirection="Horizontal"> <asp:ListItem Value="Text" Selected="True">Text</asp:ListItem> <asp:ListItem Value="HTML">HTML</asp:ListItem> </asp:radiobuttonlist></td> </tr> <tr> <td vAlign="middle" align="right">Message :</td> <td height="84"> <p><asp:textbox id="txtBody" tabIndex="4" runat="server" Font-Names="Verdana" Font-Size="X-Small" columns="40" rows="5" textmode="MultiLine" width="350px"></asp:textbox></p> </td> </tr> <tr> <td vAlign="middle" align="right">Attachment :</td><td><input id="inpAttachment1" tabIndex="5" type="file" size="53" name="filMyFile" runat="server"></td> </tr> <tr> <td vAlign="middle" align="right">Attachment :</td> <td><input id="inpAttachment2" tabIndex="6" type="file" size="53" name="filMyFile" runat="server"></td> </tr> <tr> <td vAlign="middle" align="right">Attachment :</td> <td><input id="inpAttachment3" tabIndex="7" type="file" size="53" name="filMyFile" runat="server"></td> </tr> <tr> <td align="center" colSpan="2"><asp:button id="btnSend" tabIndex="9" runat="server" width="100px" text="Send" onclick="btnSend_Click"></asp:button></td> </tr> <tr> <td align="center" colSpan="2"><asp:Label ID="lblMessage" Runat="server"></asp:Label> </td> </tr> </table> </td> </tr> </table> </form> </body> </html>

The Default.aspx will now look like:

Now Let us code for the Functionality double Click on the button and the event handler is genrated for the buttonclick
Before we start the code for the event let us include some namespaces:

using System.Net.Mail;
using System.IO;
using System.Drawing;

Here is the code for the button event. The code is having inline commets to explain the meamning of each line.

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Net.Mail; using System.IO; using System.Drawing;

namespace SendMailWithAttachment { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void btnSend_Click(object sender, EventArgs e) {

try { /* Create a new blank MailMessage with the from and to adreesses*/ MailMessage mailMessage = new MailMessage txtSender.Text,txtReceiver.Text); /*Checking the condition that the cc is empty or not if not then * include them */ if (txtCc.Text != null && txtCc.Text != string.Empty) { mailMessage.CC.Add(txtCc.Text); } /*Checking the condition that the Bcc is empty or not if not then * include them */ if (txtBcc.Text != null && txtBcc.Text != string.Empty) { mailMessage.Bcc.Add(txtBcc.Text); } //Ading Subject to the Mail mailMessage.Subject = txtSubject.Text; //Adding the Mail Body mailMessage.Body = txtBody.Text; /* Set the properties of the MailMessage to the values on the form as per the mail is HTML formatted or plain text */ if (rblMailFormat.SelectedItem.Text == "Text") mailMessage.IsBodyHtml = false; else mailMessage.IsBodyHtml = true; /* We use the following variables to keep track of attachments and after we can delete them */ string attach1 = null; string attach2 = null; string attach3 = null; /*strFileName has a attachment file name for attachment process. */ string strFileName = null; /* Bigining of Attachment1 process & Check the first open file dialog for a attachment */ if (inpAttachment1.PostedFile != null) { /* Get a reference to PostedFile object */ HttpPostedFile attFile = inpAttachment1.PostedFile; /* Get size of the file */ int attachFileLength = attFile.ContentLength; /* Make sure the size of the file is > 0 */ if (attachFileLength > 0) { /* Get the file name */ strFileName = Path.GetFileName(inpAttachment1.PostedFile.FileName);

/* Save the file on the server */ inpAttachment1.PostedFile.SaveAs(Server.MapPath(strFileName)); /* Create the email attachment with the uploaded file */ Attachment attach = new Attachment(Server.MapPath(strFileName)); /* Attach the newly created email attachment */ mailMessage.Attachments.Add(attach); /* Store the attach filename so we can delete it later */ attach1 = strFileName; } } /* Attachment-2 Repeat previous step defiend above*/ if (inpAttachment2.PostedFile != null) { HttpPostedFile attFile = inpAttachment2.PostedFile; int attachFileLength = attFile.ContentLength; if (attachFileLength > 0) { strFileName = Path.GetFileName(inpAttachment2.PostedFile.FileName); inpAttachment2.PostedFile.SaveAs(Server.MapPath(strFileName)); Attachment attach = new Attachment(Server.MapPath(strFileName)); mailMessage.Attachments.Add(attach); attach2 = strFileName; } } /* Attachment-3 Repeat previous steps step defiend above*/ if (inpAttachment3.PostedFile != null) { HttpPostedFile attFile = inpAttachment3.PostedFile; int attachFileLength = attFile.ContentLength; if (attachFileLength > 0) { strFileName = Path.GetFileName(inpAttachment3.PostedFile.FileName); inpAttachment3.PostedFile.SaveAs(Server.MapPath(strFileName)); Attachment attach = new Attachment(Server.MapPath(strFileName)); mailMessage.Attachments.Add(attach); attach3 = strFileName; } } /* Set the SMTP server and send the email with attachment */ SmtpClient smtpClient = new SmtpClient(); // smtpClient.Host = emailServerInfo.MailServerIP; //this will be the host in case of gamil and it varies from the service provider smtpClient.Host = "smtp.gmail.com"; //smtpClient.Port = Convert.ToInt32 emailServerInfo.MailServerPortNumber); //this will be the port in case of gamil for dotnet and it varies from the service provider smtpClient.Port = 587; smtpClient.UseDefaultCredentials = true; //smtpClient.Credentials = new System.Net.NetworkCredential(emailServerInfo.MailServerUserName, emailServerInfo.MailServerPassword); smtpClient.Credentials = new System.Net.NetworkCredential(txtUserName.Text, txtPassword.Text); //this will be the true in case of gamil and it varies from the service provider smtpClient.EnableSsl = true; smtpClient.Send(mailMessage); /* Delete the attachements if any */ try{

if (attach1 != null) File.Delete(Server.MapPath(attach1)); if (attach2 != null) File.Delete(Server.MapPath(attach2)); if (attach3 != null) File.Delete(Server.MapPath(attach3));

} catch{} /* clear the controls */ txtSender.Text = string.Empty; txtReceiver.Text = string.Empty; txtCc.Text = string.Empty; txtBcc.Text = string.Empty; txtSubject.Text = string.Empty; txtBody.Text = string.Empty; txtUserName.Text = string.Empty; /* Dispaly a confirmation message to the user. */ lblMessage.Visible = true; lblMessage.ForeColor = Color.Black; lblMessage.Text = "Message sent."; } catch (Exception ex) { /* Print a message informing the user about the exception that was risen */ lblMessage.Visible = true; lblMessage.ForeColor = Color.Red; lblMessage.Text = ex.ToString(); } } } }

Download code from here

Thanks and Regards

Meetu Choudhary

My Blog My Web My Forums

The following Sample Code is the code which can be used to send mails through ASP.Net C#.... its a working code for me.....

[code]
using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 Button1_Click(object sender, EventArgs e)
  {
//Calling the function SendMail
    Response.Write( SendMail("meetuchoudhary@gmail.com","meetudmeet@gmail.com","meetudmeet@yahoo.com","Test Mail","Test Mail Body"));
  }

  public string SendMail(string toList, string from, string ccList, string subject, string body)
  {
      MailMessage message = new MailMessage();
      SmtpClient smtpClient = new SmtpClient();
      string msg = string.Empty;
      try
      {
          MailAddress fromAddress = new MailAddress(from);
          message.From = fromAddress;
          message.To.Add(toList);
          if (ccList != null && ccList != string.Empty)
              message.CC.Add(ccList);
          message.Subject = subject;
          message.IsBodyHtml = true;
          message.Body = body;
          smtpClient.Host = "mail.server.com";
          smtpClient.Port = 25;
          smtpClient.UseDefaultCredentials = true;
          smtpClient.Credentials = new System.Net.NetworkCredential("info@server.com", "password");         

          smtpClient.Send(message);
          msg = "Successful";
      }
      catch (Exception ex)
      {
          msg = ex.Message;
      }
      return msg;
  }

}
[/code]

--
Thanks and Regards
Meetu Choudhary

Meetu's Desk [Meetu Choudhary]

Friday, August 14, 2009