How to retreive data from database to a table in asp webform

Question

Good day i created a table to be displayed on A adminlte template but it is not displaying the data from the database on the table

namespace WebApplication4
{
    public partial class transahis : System.Web.UI.Page
    {
        SqlDataAdapter da;
        DataSet ds = new DataSet();
        StringBuilder htmlTable = new StringBuilder();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                binddata();
            }
        }
        private void binddata()
        {
            SqlConnection con = new SqlConnection();
            ;
            con.ConnectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\odt\Documents\login.mdf;Integrated Security=True;Connect Timeout=30";
            //con.Open();
            // SqlCommand cmd = new SqlCommand();
            //cmd.CommandText = "select * from [log] ";
            SqlCommand cmd = new SqlCommand("SELECT * FROM log ", con);
            da = new SqlDataAdapter(cmd);
            da.Fill(ds);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
            //cmd.Connection = con;
            // SqlDataReader dt = cmd.ExecuteReader();
            htmlTable.Append("<table border='1'>");
            htmlTable.Append("<tr style='background-color:green; color: White;'><th>ID</th><th>Name</th><th>password</th></tr>");
            if (!object.Equals(ds.Tables[0], null))
            {
                if (ds.Tables[0].Rows.Count > 0)
                {
                    for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                    {
                        htmlTable.Append("<tr style='color: White;'>");
                        htmlTable.Append("<td>" + ds.Tables[0].Rows[i]["Id"] + "</td>");
                        htmlTable.Append("<td>" + ds.Tables[0].Rows[i]["username"] + "</td>");
                        htmlTable.Append("<td>" + ds.Tables[0].Rows[i]["password"] + "</td>");
                        /* htmlTable.Append("<td>" + ds.Tables[0].Rows[i]["ContactNo"] + "</td>")*/
                        ;
                        htmlTable.Append("</tr>");
                    }
                    htmlTable.Append("</table>");
                    hph.Controls.Add(new Literal { Text = htmlTable.ToString() });
                }
                else
                {
                    htmlTable.Append("<tr>");
                    htmlTable.Append("<td align='center' colspan='4'>There is no Record.</td>");
                    htmlTable.Append("</tr>");
                }
            }
        }
    }
}