Displaying Data On Textbox From Database, I Have 3 Textboxes To Display The Data Fetched From Database

protected void Button1_Click(object sender, EventArgs e)
    {
        SqlConnection con1 = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        DataTable dt = new DataTable();
        con1.Open();
        SqlDataReader myReader = null;
        SqlCommand myCommand = new SqlCommand("select * from s3 where username='" + Session["username"] + "'", con1);

    while (myReader.Read())
        {
           
            TextBox1.Text=(myReader["username"].ToString());
            TextBox2.Text=(myReader["password"].ToString());
            TextBox3.Text=(myReader["email"].ToString());
        }
        con1.Close();
    }