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.
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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;
}
}
