SEND AN EMAIL WITH ATTACHMENT USING C#

I have described an example to send an email using ASP.NET in C# and using GMAIL as a port.The Namespaces to be used are System.Net.Mail and System.IO. The code is written in the way that the attachment is stored in a folder temporarily before sending it and will be deleted afterwards.

In ASPX Page,

<table cellpadding="5" cellspacing="0" border="0">

  <tr>

    <td>To</td>

    <td>:</td>

    <td>

      <asp:TextBox ID="ToTextBox" runat="server" Width="400px"></asp:TextBox>

    </td>

  </tr>

  <tr>

    <td>Cc</td>

    <td>:</td>

    <td><asp:TextBox ID="CcTextBox" runat="server" Width="400px"></asp:TextBox></td>

  </tr>

  <tr>

    <td>Subject</td>

    <td>:</td>

    <td><asp:TextBox ID="SubjectTextBox" runat="server" Width="400px"></asp:TextBox></td>

  </tr>

  <tr>

    <td>Attachments</td>

    <td>:</td>

    <td>

    <asp:FileUpload ID="FileUpload" runat="server" Width="400px" />

    </td>

  </tr>

  <tr>

    <td valign="top">Message</td>

    <td valign="top">:</td>

    <td>

<asp:TextBox ID="MessageTextBox" runat="server" TextMode="MultiLine" Columns="20"   Rows="10" Width="400px"></asp:TextBox></td>

  </tr>

  <tr>

    <td colspan="4" align="right">

    <asp:Button ID="SendButton" runat="server" Text="Send"

     onclick="SendButton_Click" /></td>

  </tr>

</table>

<div>

    <asp:Label ID="StatusLabel" runat="server" Text="" ForeColor="Green" Font-Size="Large" Visible="false"></asp:Label>

</div>

                

In ASPX.CS Page,

    protected void SendButton_Click(object sender, EventArgs e)

    {

        this.StatusLabel.Visible = true;

        string FileName = string.Empty;

        MailMessage objMail = new MailMessage();

        objMail.From = new MailAddress("Your Mail Address");

        objMail.To.Add(new MailAddress(ToTextBox.Text.Trim()));

        if (CcTextBox.Text != string.Empty)

        {

            objMail.CC.Add(new MailAddress(CcTextBox.Text.Trim()));

        }

        objMail.Subject = SubjectTextBox.Text.Trim();

        objMail.Body = MessageTextBox.Text.Trim();

        objMail.IsBodyHtml = true;

        try

        {

            if (FileUpload.HasFile)

            {

                HttpPostedFile pf = this.FileUpload.PostedFile;

                // Filepath in which the file has to be stored

                FileName = Server.MapPath("~") + @"\uploads\" + FileUpload.FileName.Substring(FileUpload.FileName.LastIndexOf('\\') + 1);

                if (pf.ContentLength > 0)

                {

                    pf.SaveAs(FileName);

                    pf.InputStream.Flush();

                    pf.InputStream.Close(); // just in case any other process has the handle

                }

                pf.InputStream.Dispose();

                Attachment attach = new Attachment(FileName);

                objMail.Attachments.Add(attach);

            }

        SmtpClient client = new SmtpClient();

        client.Credentials = new System.Net.NetworkCredential("Mail Address", "Password");

        client.Port = 587; // Gmail works on this port

        client.Host = "smtp.gmail.com";

        client.EnableSsl = true; //Gmail works on SSL

        client.Send(objMail);

       

        objMail.Dispose();

        client.Dispose();

        if (FileUpload.HasFile)

        {

            File.Delete(FileName);

        }

       

        }

        catch (SmtpFailedRecipientsException exp)

        {

            StatusLabel.Text = "Unable to send email to " + exp.FailedRecipient;

        }

        catch (SmtpFailedRecipientException exp)

        {

            StatusLabel.Text = "Unable to send email to " + exp.FailedRecipient + "<br />Error Message: " + exp.Message.Replace("'", "\'");

        }

        catch (SmtpException exp)

        {

            StatusLabel.Text = "There was a problem in sending the email to " + ToTextBox.Text.Trim() + "<br />" + exp.Message.Replace("'", "\'");

        }

        catch (Exception exp)

        {

            StatusLabel.Text = "There was an Unknown Problem in sending the email:<br />"

                            + exp.Message.Replace("'", "\'");

        }

        if (StatusLabel.Text == string.Empty)

        {

            StatusLabel.Text = "Mail sent successfully";

            ToTextBox.Text = string.Empty;

            CcTextBox.Text = string.Empty;

            SubjectTextBox.Text = string.Empty;

            MessageTextBox.Text = string.Empty;

        }

    }