Excel File downloading page contents

Hi,

I have excel file on my server and I want to send it client side. 

I have the follwing code

Response.Buffer = true;
Response.ClearContent();
Response.ContentType = "application/ms-excel";
Response.AddHeader("Content-Disposition", @"attachment;filename=" + fileName);
Response.Charset = "";
Response.TransmitFile(Server.MapPath(fileName));
HttpContext.Current.ApplicationInstance.CompleteRequest();
System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);

On client side I m receiving the file but it has Page contents and not the contents which i have saved in it.

Please help.

Thanks

Ashok