HTML Report in c# .Net

//Blog does not take starting tag of the html.....please write all starting tag and end tag before each table tag,th tag and tr tag and td tag and closing tag...


protected void btnHtmlkReport_Click(object sender, EventArgs e)
{
conn.open();
SqlCommand cmd = new SqlCommand("select * from students", conn);
SqlDataReader oDr = cmd.ExecuteReader();
if (oDr.HasRows)
{
StringBuilder sb = new StringBuilder();
sb.Append("table align='center'>");
sb.Append("tr> td > th>Financial Report /th>/td>/tr>");
sb.Append("tr>td align='center'>");
sb.Append("id".ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append("Name".ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append("Roll".ToString());
// finish the rest of the row
sb.Append("");
// get your data
while (oDr.Read())
{
sb.Append("tr>td align='center'>");
sb.Append(oDr["id"].ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append(oDr["Name"].ToString());
sb.Append("/td>");
sb.Append("td align='center'>");
sb.Append(oDr["Roll"].ToString());
// finish the rest of the row
sb.Append("/td>/tr>");
}
sb.Append("/table>");
Response.Write(sb);
con.close();
}
}