asp.net sending mail through smtp server or gmail smtp server or how to send mail in asp.net

Introduction:

In this example iam going to explain how to send email in asp.net using Gmail Smtp server.

Description:

In this example we need to specify hostname user name ,password,port number in web.config.when ever you want to change credentials you can change in web.config only.

To Implement this example First You design your aspx page like this.

<title>Sending Mail using smtp server</title>

</head>

<body>

<b>Send Mail using gmail credentials in asp.net</b>

</div>

To:

</div>

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

</div>

CC:

</div>

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

</div>

Subject:

</div>

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

</div>

Body:

</div>

<asp:TextBox ID="txtBody" runat="server" TextMode="MultiLine" Columns="30" Rows="10"> </asp:TextBox>

</div>

<asp:Button ID="btnSubmit" Text="Send" runat="server" OnClick="btnSubmit_Click" />

</div>

<asp:Label ID="lblMessage" runat="server" ForeColor="Red" style="margin-left: 250px;"> </asp:Label>

</form>

</body>

</html>

In Web.Config add below code after <appSettings/> tag.

<system.net>

</smtp>

</mailSettings>

</system.net>

Now you add below namespace in code behind:

using System.Net;
using System.Net.Mail;

Now write the Below code in Code behind.

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            NetworkCredential NC = new NetworkCredential();
            SmtpClient smtp = new SmtpClient();
            MailMessage mailmsg = new MailMessage();

            mailmsg.Subject = txtSubject.Text;
            mailmsg.Body = txtBody.Text;
            mailmsg.To.Add(txtTo.Text);
            mailmsg.CC.Add(txtcc.Text);

            mailmsg.IsBodyHtml = true;
            smtp.EnableSsl = true;
            NC = (NetworkCredential)smtp.Credentials;
            smtp.Send(mailmsg);
            mailmsg = null;
            lblMessage.Text = "Your email has been sent";
        }
        catch (Exception ex)
        {
            lblMessage.Text = ex.ToString();
        }
    }

If u get any error regarding security remove smtp.EnableSsl = true;

Demo: