比如访问:
http://localhost/forums/MySendMessage.aspx?ForumID=0&ReturnUrl=/forums/User/MessageDetail.aspx?UserID=190&MessageID=19
其实ReturnURL的值应该是/forums/User/MessageDetail.aspx?UserID=190&MessageID=19
但是实际上,在MySendMessage.aspx页中,所得到的ReturnURL参数的值是/forums/User/MessageDetail.aspx?UserID=190 
如果解决这个问题呢?