How to send mail with multiple attachments in asp.net with C#,Vb.Net

Introduction: In previous articles i explained how to Send email to multiple users based on CheckBox selection inside GridView in asp.net C#,VB.Net and Send emails in asp.net using Gmail | How to set Smtp setting in web.config file to send emails in asp.net using Gmail and Drag & drop to upload multiple files using AjaxFileUpload like Facebook in asp.net and  How to create log file to record errors and exceptions in asp.net.

In this article I am going to explain how to send email with multiple attachments using asp.net in C# and VB.Net. 

Click on image to enlarge

Description: I have used three FileUpload controls in this example so you can send three attachments with the email. But if you want to send more attachments with email then just add more FileUpload controls as per requirement. There is also option of Cc(Carbon copy) and Bcc( Blank Carbon Copy) option to send mail like Gmail, Yahoo, Rediffmail etc mail servers.

Implementation: Now let’s create the web application to send mail with multiple attachments using SMTP (Simple Mail Transfer Protocol) 

• In the design page(.aspx) design the form as:

Source Code:

<fieldset style="width:450px;">

        <legend>Send mail with multiple attachments in asp.net</legend>       

        <table>

            <tr>

                <td>From</td>

                <td>

                    <asp:TextBox ID="txtFrom" runat="server"></asp:TextBox>

                    <asp:RequiredFieldValidator ID="rfvFrom" runat="server" ErrorMessage="Email address can't be left blank" ControlToValidate="txtFrom" Display="Dynamic" ForeColor="#FF3300" SetFocusOnError="True"></asp:RequiredFieldValidator>

                    <asp:RegularExpressionValidator ID="rgeFrom" runat="server" ErrorMessage="Please enter valid email format" ControlToValidate="txtFrom" ForeColor="#FF3300" SetFocusOnError="True" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" Display="Dynamic" ></asp:RegularExpressionValidator>

                </td>

            </tr>

            <tr>

                <td>To</td>

                <td>

                    <asp:TextBox ID="txtTo" runat="server"></asp:TextBox>

                    <asp:RequiredFieldValidator ID="rfvTo" runat="server" ErrorMessage="Email address can't be left blank" ControlToValidate="txtTo" Display="Dynamic" ForeColor="#FF3300" SetFocusOnError="True"></asp:RequiredFieldValidator>

                    <asp:RegularExpressionValidator ID="rgeTo" runat="server" ErrorMessage="Please enter valid email format" ControlToValidate="txtTo" ForeColor="#FF3300" SetFocusOnError="True" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" Display="Dynamic"></asp:RegularExpressionValidator>

                </td>

            </tr>

            <tr>

                <td>Cc</td>

                <td>

                    <asp:TextBox ID="txtCc" runat="server"></asp:TextBox>

                    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtCc" Display="Dynamic" ErrorMessage="Please enter valid email format" ForeColor="#FF3300" SetFocusOnError="True"></asp:RegularExpressionValidator>

                </td>

            </tr>

            <tr>

                <td>Bcc</td>

                <td>

                    <asp:TextBox ID="txtBcc" runat="server"></asp:TextBox>

                    <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtBcc" Display="Dynamic" ErrorMessage="Please enter valid email format" ForeColor="#FF3300" SetFocusOnError="True"></asp:RegularExpressionValidator>

                </td>

            </tr>

            <tr>

                <td>Subject</td>

                <td>

                    <asp:TextBox ID="txtSubject" runat="server" ></asp:TextBox>

                </td>

            </tr>

            <tr>

                <td>Attach file</td>

                <td>                   

                    <asp:FileUpload ID="FileUpload1" runat="server" />                   

                </td>

            </tr>

            <tr>

                <td>Attach file</td>

                <td>                    

                    <asp:FileUpload ID="FileUpload2" runat="server" />                   

                </td>

            </tr>

            <tr>

                <td>Attach file</td>

                <td>                   

                    <asp:FileUpload ID="FileUpload3" runat="server" />                   

                </td>

            </tr>

            <tr>

                <td>Body/Message</td>

                <td>

                    <asp:TextBox ID="txtBody" runat="server" Height="89px" TextMode="MultiLine" Width="331px"></asp:TextBox>

                </td>

            </tr>

            <tr>

                <td>&nbsp;</td>

                <td>

                    <asp:Button ID="btnSendMail" runat="server" Text="Send Mail" OnClick="btnSendMail_Click" />

                    <asp:Label ID="lblStatus" runat="server" Text=""></asp:Label>

                </td>

            </tr>

        </table>       

    </fieldset>

• Notice that in this article I have also used the RegularExpression validation control and RequiredFiledvalidator validation control to validate the Email Id’s in the “To”,"Cc","Bcc" and “From” field. To get detailed knowledge on RegularExpression validation control and RequiredFieldValidator validation control read my articles on Validation controls in asp.net.

C#.Net Code to send mail with multiple attachments using asp.net with C# and Vb.Net

Include following namespace:

using System.Net.Mail;

then write the code as:

protected void btnSendMail_Click(object sender, EventArgs e)

    {

        MailMessage mail = new MailMessage();

        try

        {          

            mail.To.Add(txtTo.Text.Trim()); // Email address of the recepient 

            mail.CC.Add(txtCc.Text.Trim());// Carbon copy Email address

            mail.Bcc.Add(txtBcc.Text.Trim());// Blank Carbon copy Email address

            mail.From = new MailAddress(txtFrom.Text.Trim(),"Sender Name"); // Email address of the sender and Display name(optional)

            mail.Subject = txtSubject.Text.Trim();  // Email subject

            mail.Body = txtBody.Text.Trim();  //Email body i.e. the content of the email

            mail.IsBodyHtml = true;

            //If the FileUpload Control has file selected. then attaching the  file

            if (FileUpload1.HasFile)

            {

                mail.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));

            }

            if (FileUpload2.HasFile)

            {

                mail.Attachments.Add(new Attachment(FileUpload2.PostedFile.InputStream, FileUpload2.FileName));

            }

            if (FileUpload3.HasFile)

            {

                mail.Attachments.Add(new Attachment(FileUpload3.PostedFile.InputStream, FileUpload3.FileName));

            }

            SmtpClient smtp = new SmtpClient();

            smtp.Host = "smtp.gmail.com"; //You can also use your SMTP Server Address here

            smtp.Credentials = new System.Net.NetworkCredential("YourGmailId@gmail.com", "YourGmailPassword"); //Or use your Smtp Email ID and Password if Host is not Gmail

            smtp.EnableSsl = true;

            smtp.Send(mail);

            ClearControls();//Clear all controls after sending mail

            lblStatus.Text = "Email sent successfully";

        }

        catch (Exception ex)

        {

            lblStatus.Text = "Email couldn't be sent";

        }      

    }

    protected void ClearControls()

    {

        txtFrom.Text = string.Empty;

        txtTo.Text = string.Empty;

        txtCc.Text = string.Empty;

        txtBcc.Text = string.Empty;

        txtSubject.Text = string.Empty;

        txtBody.Text = string.Empty;  

      }

VB.Net Code to send mail with multiple attachments using asp.net with C# and Vb.Net

Note: Design the form same as C#.Net page(.aspx) above but just change the line <asp:Button ID="btnSendMail" runat="server" Text="Send Mail" OnClick="btnSendMail_Click" /> with  <asp:Button ID="btnSendMail" runat="server" Text="Send Mail" />

Then in code behind file(.aspx.cs) import following namespace:

Imports System.Net.Mail

then write the code as:

Protected Sub btnSendMail_Click(sender As Object, e As EventArgs) Handles btnSendMail.Click

        Dim mail As New MailMessage()

        Try

            mail.[To].Add(txtTo.Text.Trim()) ' Email address of the recepient 

            mail.[CC].Add(txtCc.Text.Trim()) 'Carbon copy Email address

            mail.[Bcc].Add(txtBcc.Text.Trim()) ' Blank Carbon copy Email address       

            mail.From = New MailAddress(txtFrom.Text.Trim(), "Sender Name") ' Email address of the sender and Display name(optional)

            mail.Subject = txtSubject.Text.Trim() ' Email subject

            mail.Body = txtBody.Text.Trim() 'Email body i.e. the content of the email

            mail.IsBodyHtml = True

            'If the FileUpload Control has file selected. then attaching the  file

            If FileUpload1.HasFile Then

                mail.Attachments.Add(New Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName))

            End If

            If FileUpload2.HasFile Then

                mail.Attachments.Add(New Attachment(FileUpload2.PostedFile.InputStream, FileUpload2.FileName))

            End If

            If FileUpload3.HasFile Then

                mail.Attachments.Add(New Attachment(FileUpload3.PostedFile.InputStream, FileUpload3.FileName))

            End If

            Dim smtp As New SmtpClient()

            smtp.Host = "smtp.gmail.com" 'You can also use your SMTP Server Address here

            smtp.Credentials = New System.Net.NetworkCredential("YourGmailId@gmail.com", "YourGmailPassword") 'Or use your Smtp Email ID and Password if Host is not Gmail

            smtp.EnableSsl = True

            smtp.Send(mail)

            ClearControls() 'Clear all controls after sending mail

            lblStatus.Text = "Email sent successfully"

        Catch ex As Exception

            lblStatus.Text = "Email couldn't be sent"

        End Try

    End Sub

    Protected Sub ClearControls()

        txtFrom.Text = String.Empty

        txtTo.Text = String.Empty

        txtCc.Text = String.Empty

        txtBcc.Text = String.Empty

        txtSubject.Text = String.Empty

        txtBody.Text = String.Empty

    End Sub

Now over to you:

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