Code for forgot password, email not sent out. C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System;
using System.Data;
using System.Data.SqlClient;
using System.Net.Mail;
using System.Configuration;

public partial class ForgotPassword : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        try {
            DataSet ds = new DataSet();
            string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
            using (SqlConnection con = new SqlConnection(connectionString))
            {
                con.Open();
                SqlCommand cmd = new SqlCommand("SELECT UserName, Password FROM Users Where Email='" + txtEmail.Text.Trim() + "'", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                con.Close();
            }
            if (ds.Tables[0].Rows.Count>0)
            {
                MailMessage msg = new MailMessage();
                msg.From = new MailAddress(txtEmail.Text);
                msg.To.Add(txtEmail.Text);
                msg.Subject="Share It: Password Recovery";
                msg.Body="Hi, " + ds.Tables[0].Rows[0]["FirstName"] +" " + ds.Tables[0].Rows[0]["LastName"] +"<br />As requested, here is your login details<br /><br />Your Username: " + ds.Tables[0].Rows[0]["UserName"] + "<br /><br />Your Password: " + ds.Tables[0].Rows[0]["Password"] + "<br /><br />Thank you for trusting us! Hope to hear from you soon!<br /><br />";
                msg.IsBodyHtml = true;

                SmtpClient smtp = new SmtpClient("smtp.gamil.com", 587);
                smtp.UseDefaultCredentials = false;
                //smtp.Host = "smtp.gmail.com";
                //smtp.Port = 587;
                smtp.Credentials = new System.Net.NetworkCredential("theresakang93@gmail.com", "passwordremoved");
                smtp.EnableSsl = true;
                smtp.Send(msg);
                lbltxt.Text = "Your Password Details Sent to your mail.";
            }
        
            else
            
                lbltxt.Text = "The Email you entered does not exists.";
        }    
        catch (Exception ex) {
        
                Console.WriteLine("{0} Exception caught.", ex);
                lbltxt.Text = "Unable to send";
            }