window application download dialogue box for excel download

try
{
    Microsoft.Office.Interop.Word.ApplicationClass wordObject = new Microsoft.Office.Interop.Word.ApplicationClass();
    //object File = @"C:\Documents and Settings\admin\My Documents\Visual Studio 2008\Projects\JyoBussinessApplication\JyoBussinessApplication\solvent_letterhead.doc";
    object File = @"C:\Documents and Settings\admin\My Documents\Visual Studio 2008\Projects\JyoBussinessApplication\JyoBussinessApplication\VinayakaEnterprise_letterhead.docx";
    object nullobject = System.Reflection.Missing.Value;


    //object nullobject = System.Reflection.Missing.Value;
    Microsoft.Office.Interop.Word.Application wordobject = new Microsoft.Office.Interop.Word.Application();
    wordobject.DisplayAlerts = Microsoft.Office.Interop.Word.WdAlertLevel.wdAlertsNone;
    Microsoft.Office.Interop.Word._Document docs = wordObject.Documents.Open(ref File, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject, ref nullobject);

    //  docs.ActiveWindow.Selection.WholeStory();
    // docs.ActiveWindow.Selection.Copy();
}
catch
{

}