Send email with gmail

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C#

ASP.NET

The code to send emails with gmail smtp server doesn't seem to working

What I have tried:

Web.config

system.net
mailSettings
smtp deliveryMethod="Network" from="***"
network host="smtp.gmail.com" port="587" userName="***" password="***"
smtp
mailSettings
system.net

aspx.cs

SmtpClient smptclient = new SmtpClient();
MailMessage message = new MailMessage();
message.To.Add(new MailAddress(txtEmail.Text.ToString()));
message.Subject = "Welcome to XcellIT";
message.Body = "Thank you for joining XcellIT";
smptclient.Send(message);