//删除原有图片
public void DeletePhoto(string ID)
{
string str = newshelper.NewsDelPhoto(ID);
if (str != "")
{
string strPath = HttpContext.Current.Request.FilePath + "/../../upload_Img/News"; //项目根路径
string fullname = Server.MapPath(strPath + "/" + str);//保存文件的路径
DeleteOldAttach(fullname);
}
}