(C#) ASP.NET Response.ContentType() - Response Object

<%@ Page Language="C#" Debug="true" %>
<script runat="server">
    void Page_Load(object sender, EventArgs e)
	{
		Response.Clear();
		Response.AddHeader("Content-Disposition", "Attachment;Filename=Excel.xls");
		Response.Buffer = true;
		Response.Charset = "UTF-8";
		Response.ContentType = "application/vnd.ms-excel";

		Response.Write("<table width=500  border=1>");
		Response.Write("  <tr>");
		Response.Write("	<td>Column1</td>");
		Response.Write("	<td>Column2</td>");
		Response.Write("	<td>Column3</td>");
		Response.Write("  </tr>");
		Response.Write("  <tr>");
		Response.Write("	<td>1</td>");
		Response.Write("	<td>2</td>");
		Response.Write("	<td>3</td>");
		Response.Write("  </tr>");
		Response.Write("  <tr>");
		Response.Write("	<td>4</td>");
		Response.Write("	<td>5</td>");
		Response.Write("	<td>6</td>");
		Response.Write("  </tr>");
		Response.Write("</table>");
	}
</script>