Download Excel file from the Document Library in the SharePoint 2010

SPSite site = SPContext.Current.Site;

SPWeb web = SPContext.Current.Web;

SPList doclib = web.Lists["Shared Documents"];

foreach (SPListItem itemin doclib.Items)

 {

    var fileName = item.File.Name;

    byte[] binFile = item.File.OpenBinary();

    SPFile fileToDownload = web.GetFile(doclib.RootFolder.Url +"/" + fileName);

    Int32 bufferLength = 4096;

    Int32 readLength = bufferLength;

    Byte[] buffer =new Byte[bufferLength];

    System.IO.Stream fstream = fileToDownload.OpenBinaryStream();

                Response.ContentType ="application/vnd.ms-excel";

                Response.AppendHeader("Content-Disposition","attachment; filename=" + fileName);

                while (readLength == buffer.Length)

                {

                    readLength = fstream.Read(buffer, 0, bufferLength);

                    Response.OutputStream.Write(buffer, 0, readLength);

                    if (readLength < bufferLength)break;

                }

               Response.End();

               Response.Flush();

   }