asp.net - Could not call Webservice on second time c# -

i use web service insert new user. works while insert data first time. when insert not getting response. please find code below.

scserviceapi webservice = new scserviceapi(); userinfo newuser = new userinfo(); newuser.username = musername; newuser.password = mpassword; newuser.servicecenter = mservicecenter; newuser.companyuniqueid = configurationmanager.appsettings["webserviceuniqueid"].tostring();  userinfo[] newuserinfo = new userinfo[] { newuser };  userresponse[] muserresponse = webservice.insertuserinfo(newuserinfo); 

works perfect on windows application problem when using same web application.

**this first question here. pls ignore if mistake in typo :-)