private static void DownloadFile(bool forceDownload, string fname, Page page)
		{
			string path = page.MapPath( fname );
			string name = Path.GetFileName( path );
			string ext =  Path.GetExtension( path );
			string type = "";
			// set known types based on file extension  
			if ( ext != null )
			{
				switch( ext.ToLower() )
				{
					case ".gif":
						type = "Picture/gif";
						break;
				}
			}
			if ( forceDownload )
			{
				page.Response.AppendHeader( "content-disposition",
					"attachment; filename=" + name );
			}
			if ( type != "" )   
				page.Response.ContentType = type;
			page.Response.WriteFile( path );
			page.Response.End();    
		}