How to use Literal and Placeholder in asp.net ?

Design Page :-

       <div>

            <fieldset>

                <legend>Using Placeholder & Literals</legend>

                <asp:PlaceHolder ID="PlaceHolder1" runat="server" />

            <br />

                <asp:Literal ID="literalDemo" runat="server" />

            </fieldset>

</div>

Coding Page : -

Make class like this : -

        private static DataTable GetData()

        {

            DataTable dt = new DataTable();

            using (SqlConnection con = new SqlConnection(Common.Global.myconstring))

            {

                SqlDataAdapter adp = new SqlDataAdapter("GetData", con); //call procedure

                adp.Fill(dt);

            }

            return dt;

        }

        protected void Page_Load(object sender, EventArgs e)

        {

            DataTable dt = GetData();

            StringBuilder sb = new StringBuilder();

            sb.Append("<table>");

            sb.Append("<tr>");

            foreach (DataColumn col in dt.Columns)

            {

                sb.Append("<th>");

                sb.Append(col.ColumnName);

                sb.Append("</th>");

            }

            sb.Append("</tr>");

            foreach(DataRow dr in dt.Rows)

            {

                sb.Append("<tr>");

                foreach(DataColumn col in dt.Columns)

                {

                    sb.Append("<td>");

                    sb.Append(dr[col.ColumnName]);

                    sb.Append("</td>");

                }

                

                sb.Append("</tr>");

            }

            sb.Append("</html>");

            literalDemo.Text = sb.ToString();

            // you can also use this if you take placeholder in design page.

            PlaceHolder1.Controls.Add(new Literal { Text = sb.ToString() });

        }

Output:-