How Can I Send A Conformation Mail After Login. Please Help Me By Editing M Y Code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
namespace logindemo
{
public partial class login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void TextBox1_TextChanged(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
string connetionString = "Data Source=INFND-DTP-023;Initial Catalog=Test_DB;User ID=alo;Password=abcd@1234";
SqlConnection conn = new
SqlConnection(connetionString);
conn.Open();
string commText = "Select * from login where User_name='" + TextBox1.Text.Trim() + "' and Password='" + TextBox2.Text.Trim() + "'";
SqlCommand cmd =new
SqlCommand(commText, conn);
SqlDataReader dr = cmd.ExecuteReader();

if (!dr.Read())
{
Response.Write("Invalid User");
}
else
{
conn.Close();
Response.Redirect("~/welcometo.aspx");
}

}

protected void Button2_Click(object sender, EventArgs e)
{
TextBox1.Text = String.Empty;
TextBox2.Text = String.Empty;
}

protected void Button3_Click(object sender, EventArgs e)
{
Response.Redirect("~/Register.aspx");
}
}
}