Source code: ASP.NET Add AutoNumber Column in GridView or DataList

Send Email using Gmail ASP.NET C# VB.NET

If you want to send email using your Gmail account or using Gmail's smtp server in ASP.NET application or if you don't have a working smtp server to send mails using your ASP.NET application or aspx page than sending e-mail using Gmail is best option.

First of all add below mentioned namespace in code behind of aspx page from which you want to send the mail.

using System.Net.Mail;

Now write this code in click event of button
C# code

protected void Button1_Click(object sender, EventArgs e)
{
  MailMessage mail = new MailMessage();
  mail.To.Add("jainamit.agra@gmail.com");
  mail.To.Add("amit_jain_online@yahoo.com");
  mail.From = new MailAddress("jainamit.agra@gmail.com");
  mail.Subject = "Email using Gmail";
  string Body = "Hi, this mail is to test sending mail"+
                "using Gmail in ASP.NET";
  mail.Body = Body;
  mail.IsBodyHtml = true;
  SmtpClient smtp = new SmtpClient();
  smtp.Host = "smtp.gmail.com";
  smtp.Credentials = new System.Net.NetworkCredential
       ("YourUserName@gmail.com","YourGmailPassword");
  smtp.EnableSsl = true;
  smtp.Send(mail);
}

VB.NET code

Imports System.Net.Mail
Protected  Sub Button1_Click
(ByVal sender As Object, ByVal e As EventArgs)
  Dim mail As MailMessage =  New MailMessage()
  mail.To.Add("jainamit.agra@gmail.com")
  mail.To.Add("amit_jain_online@yahoo.com")
  mail.From = New MailAddress("jainamit.agra@gmail.com")
  mail.Subject = "Email using Gmail"
  String Body = "Hi, this mail is to test sending mail"+
                "using Gmail in ASP.NET"
  mail.Body = Body
  mail.IsBodyHtml = True
  Dim smtp As SmtpClient =  New SmtpClient()
  smtp.Host = "smtp.gmail.com"
  smtp.Credentials = New System.Net.NetworkCredential
       ("YourUserName@gmail.com","YourGmailPassword")
  smtp.EnableSsl = True
  smtp.Send(mail)
End Sub