Add table to second sheet of Excel using C#

Question

I am dumping the data from a table to an excel sheet which is created during run time.I have the file path in Session["Fullpath"]. I am able to create the excel with contains the data of table1.Now, I have one more table table2.I want to dump the data from table table2 to the second sheet of the same excel.

Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename= " + Session["Fullpath"]);
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
table.RenderControl(htw);
Response.Output.Write(sw.ToString());
System.IO.File.WriteAllText(Session["Fullpath"].ToString(), sw.ToString());
Response.Flush();
Response.End();