Seprate two excel file for two different data items present in dropdown in asp.net?

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C#

C#4.0

I have created one dropdownlist.By default --All-- is selected in dropdown .If all is selected then after clicking on export to excel button it should generate two different excel documnet one for A and another for B(i.e One excel file for document related to A and other file related to B)

following is the code related ::

Response.ClearContent();
             

              Response.Output.Write("<tr><td></td><td></td><td></td><td></td><td colspan='2' align='center'><div align='center' style='text-align:center'>" + imagepath + "</div></td></tr>");
              Response.AddHeader("content-disposition", "attachment; filename=" + strFileName);
              Response.AddHeader("content-disposition", "attachment;filename=" + strFileName);
              Response.ContentType = "application/excel";
              System.IO.StringWriter sw = new System.IO.StringWriter();
              HtmlTextWriter htw = new HtmlTextWriter(sw);
              dg.RenderControl(htw);
              Response.Write(sw.ToString());
              Response.End();

Give me Quick Response!!