Build Html Tags using C# asp.net

protected override void Render(HtmlTextWriter output)
{
StringBuilder sb = new StringBuilder();
       
sb.AppendLine("<object type='application/x-mplayer2' height='100' width='210'><param name='src' value=''/></object>");

output.BeginRender();
output.Write(sb.ToString());
output.EndRender();
}

If you want to build any html5 tags with css using stringbuilder and HTMLtextwriter are possible to build