how to create HTML Ui using C# string Builder

This is code when i create my sample web application i want to create html ui in back end code so i created using string builder.

if (dt.Rows.Count > 0)
            {
                StringBuilder strb = new StringBuilder();
                strb.Append("<br/><br/>");
                strb.Append("<table border='1' cellpadding='3'>");
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    strb.Append("<tr><td>");
                    strb.Append(dt.Rows[i]["Subject"].ToString());
                    strb.Append("</td>");
                    strb.Append("<td>");
                    strb.Append("<input type=\"text\" name=\"subject\" id=\"txtSubject" + i.ToString() + "\" runat=\"server\" />");
                    strb.Append("<input type=\"hidden\" name=\"hidsubject\" id=\"hidSubject" + i.ToString() + "\" runat=\"server+\" value=" + dt.Rows[i]["Subject_ID"].ToString() + "/>");
                    strb.Append("</td></tr>");
                }
                //subject = subject + "," + dt.Rows[i]["Subject_ID"].ToString();
                //hidSubject.Value = subject;
                strb.Append("</table>");
                divMark.InnerHtml = strb.ToString();
            }