Send Email Functionality using ASP.NET with c sharp

Web.config file:
===========
<configuration>
  <appSettings>
    <add key="Email" value="chitharan89@gmail.com"/>
  </appSettings>
  <system.net>
    <mailSettings>
      <smtp >
        <network host="127.0.0.1" port="25" userName ="chitharan89@gmail.com" password ="9715929121" />
      </smtp>
    </mailSettings>
  </system.net>
<connectionStrings>
<add name="connection" connectionString="Data Source=SPTEST;database=db1;Integrated Security=True;  "/>
</connectionStrings>
</configuration>

protected void imgBtnshare_Click(object sender, ImageClickEventArgs e)
        {
            try
            {
                string FromEmail = ConfigurationManager.AppSettings["Email"].ToString();
                string ToEmail = "chitharan89@gmail.com";
                MailMessage Message = new MailMessage(FromEmail, ToEmail);
                Message.Subject = "To Share the Idea to Friends";
                Message.Body = "The main Purpose sharing ideas to friend and get reply ";                              
                Message.IsBodyHtml = true;
                SmtpClient SMTP = new SmtpClient();
                SMTP.Send(Message);
               
               
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);

            }

        }