Answer Posted / mahesh swami

<appSettings>
<add key="SMTPUserName" value="abcxyzabc4u@gmail.com" />
<add key="SMTPPassword" value="pnagajsuma" />
</appSettings>



using System.Configuration;
using System.Net.Mail;
using System.Text;
using System.Net;



protected void SendAcknowledgementMail()
{
MailMessage oMailMessage = new MailMessage();
NetworkCredential oCredentials = new
NetworkCredential(ConfigurationManager.AppSettings["SMTPUserName"].ToString(),
ConfigurationManager.AppSettings["SMTPPassword"].ToString());

oMailMessage.To.Add(txtEmailAddress.Text);
oMailMessage.Subject = "Testing";
oMailMessage.From = new
MailAddress(ConfigurationManager.AppSettings["SMTPUserName"].ToString());
oMailMessage.Body = "Hi this is a sample testing
mail. Pls ignore this.";
oMailMessage.IsBodyHtml = false;

SmtpClient oSmtpClient = new
SmtpClient("smtp.gmail.com");
oSmtpClient.UseDefaultCredentials = false;
oSmtpClient.EnableSsl = true;
oSmtpClient.Credentials = oCredentials;
oSmtpClient.Port = 587;
if (!string.IsNullOrEmpty(oMailMessage.Subject))
{
oSmtpClient.Send(oMailMessage);
}
}




protected void btnsend_Click(object sender, EventArgs e)
{
SendAcknowledgementMail();
}

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