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Included Namespace.
using System.Net; 
using System.Net.Mail; 

After adding Namespace use below code


protected void SendMail()
{
    var fromAddress = "frome@domain.com";
    // any address where the email will be sending
    var toAddress = "to@gmail.com"; 
    //Password of your email address
    const string fromPassword = "Password";
     // Passing the values and make a email formate to display
    string subject = YourSubject.Text.ToString();
    string body = "From: " + YourName.Text + "\n";
    body += "Email: " + YourEmail.Text + "\n";
    body += "Subject: " + YourSubject.Text + "\n";
    body += "Question: \n" + Comments.Text + "\n";
    // smtp settings
    var smtp = new System.Net.Mail.SmtpClient();
    {
        smtp.Host = "mail.domain.com";
        smtp.Port = 25;
        smtp.EnableSsl = false;
        smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
        smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
        smtp.Timeout = 20000;
    }
    // Passing values to smtp object
    smtp.Send(fromAddress, toAddress, subject, body);
}

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