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Sending Mail in ASP.NET using C#


Sending email from a web page is one of the most common functionality required from a web site. 

The System.Web.Mail Namespace in the .NET Framework contains the required support classes and enumerations for email capabilities.

The main classes used are System.Web.Mail.MailMessage and the SmtpMail class. 

Listing1 contains the listing for a simple web form to send email. This form assumes that the SMTP service is running on the server. 

Listing 1: Send an email from ASP.Net Page.

<%@ Import Namespace="System.Web.Mail" %>
<script language="c#" runat="server">

private void btnSend_Click(object sender, System.EventArgs e)

{                                                

    MailMessage msg = new MailMessage();
 

    msg.To = txtTo.Text;

    msg.From = txtFrom.Text;

    msg.Subject = txtSubject.Text;

    msg.Body = txtContent.Value;
    lblStatus.Text = "Sending...";
                                             

    SmtpMail.Send(msg);

    lblStatus.Text = "Sent email (" + txtSubject.Text + ") to " +txtTo.Text;                                         

}

</script> 

<html>

<body>

    <h3>

        Email From ASP.NET</h3>

    <form id="MailForm" method="post" runat="server">

        <asp:Label ID="Label1" Style="left: 100px; position: absolute; top: 100px" runat="server">From:   

        </asp:Label>

        <asp:TextBox ID="txtFrom" Style="left: 200px; position: absolute; top: 100px"

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

        <asp:RequiredFieldValidator ID="FromValidator1" Style="left: 100px; position: absolute;

            top: 375px" runat="server" ErrorMessage="Please Enter the Email From." Width="200px"

            Height="23px" ControlToValidate="txtFrom"></asp:RequiredFieldValidator>

        <asp:RegularExpressionValidator ID="FromValidator2" Style="left: 100px; position: absolute;

            top: 400px" runat="server" ErrorMessage="Please Enter a Valid From Email address"

            ControlToValidate="txtFrom" ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)

            *"></asp:RegularExpressionValidator>

        <asp:Label ID="Label2" Style="left: 100px; position: absolute; top: 125px" runat="server">To: 

        </asp:Label>

        <asp:TextBox ID="txtTo" Style="left: 200px; position: absolute; top: 125px"

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

        <asp:RequiredFieldValidator ID="ToValidator1" Style="left: 100px; position: absolute;

            top: 425px" runat="server" ErrorMessage="Please Enter the Email To." Width="200px"

            Height="23px" ControlToValidate="txtTo"></asp:RequiredFieldValidator>

        <asp:RegularExpressionValidator ID="ToValidator2" Style="left: 100px; position: absolute;

            top: 450px" runat="server" ErrorMessage="Please Enter a Valid To Email address"

            ControlToValidate="txtTo" ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)

            *"></asp:RegularExpressionValidator>

        <asp:Label ID="Label3" Style="left: 100px; position: absolute; top: 150px"

          runat="server">Subject</asp:Label>

        <asp:TextBox ID="txtSubject" Style="left: 200px; position: absolute; top: 150px"

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

        <asp:Label ID="Label4" Style="left: 100px; position: absolute; top: 175px" runat="server">Mail:

        </asp:Label>

        <textarea runat="server" id="txtContent" style="left: 200px; width: 400px; position: absolute;

            top: 175px; height: 125px" rows="7" cols="24">

                </textarea>

        <asp:Button ID="btnSend" Style="left: 200px; position: absolute; top: 350px" runat="server"

            Text="Send" OnClick="btnSend_Click"></asp:Button>

        <asp:Label ID="lblStatus" Style="left: 250px; position: absolute; top: 350px" runat="server"> 

        </asp:Label>

    </form>

</body>

</html>

SendMa1.gif

Figure 1 : Email Form in action

SendMa2.gif

Figure 2: Results

In order to specify another  SMTP server ,  use the SmtpServer field of the SmtpMail object as shown in figure 2 :

Listing 2: Use another mail server

private void btnSend_Click(object sender, System.EventArgs e)

{ 

    MailMessage msg = new MailMessage();

    msg.To = txtTo.Text;

    msg.From = txtFrom.Text;

    msg.Subject = txtSubject.Text;

    msg.Body = txtContent.Value;

 

    lblStatus.Text = "Sending...";

    SmtpMail.SmtpServer = "smtp.yourISP.com";

    SmtpMail.Send(msg);

    lblStatus.Text = "Sent email (" + txtSubject.Text + ") to " + txtTo.Text;
}

 

Here is a code snippet for adding attachments :

 

Listing 3: Send Attachments

{

    ....

    StrFilePath = "c:\\emps.txt";

    MailAttachment attach = new MailAttachment(strFilePath);

    msg.Attachments.Add(attach);

    ....   

}

 

Go ahead - Email enable your web pages !


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