从asp.net web应用程序调用WCF使web ui挂起直到关闭WCF连接

The Problem is when i am calling wcf webservice from asp.net Web Application UI hangs til webservice finishes it processing and connection to service get closed. The problems comes in very badly when i am calling webservice using AJAX, Complete UI Hangs till service connection get close. If you could give me any clue?The Problem is when i am calling wcf webservice