asp.net - showing The Error "ConnectionString property has not been initialized" periodically -

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i have website in vb.net , sql server high number of users. problem during day, website throws exception , not show parts of webpage. authentication performed using session , cookies. session id s written in database table , after signing out deleted. not know happens when restart iis problem obviated after time appears again. stack trace of log file below. problem?

userid:rezagmc3        sessionid:uup5l0koj3eacxl3pcqdxmbz form data: no form data found1: error description:the connectionstring property has not been initialized. 1: source:system.data 1: stack trace:   @ system.data.sqlclient.sqlconnection.permissiondemand() 1:    @ system.data.sqlclient.sqlconnectionfactory.permissiondemand(dbconnection outerconnection) 1:    @ system.data.providerbase.dbconnectionclosed.openconnection(dbconnection outerconnection, dbconnectionfactory connectionfactory) 1:    @ system.data.sqlclient.sqlconnection.open() 1:    @ sorathesab.sqlhelperparametercache.discoverspparameterset(sqlconnection connection, string spname, boolean includereturnvalueparameter, object[] parametervalues) 1:    @ sorathesab.sqlhelperparametercache.getspparametersetinternal(sqlconnection connection, string spname, boolean includereturnvalueparameter) 1:    @ sorathesab.sqlhelperparametercache.getspparameterset(sqlconnection connection, string spname, boolean includereturnvalueparameter) 1:    @ sorathesab.sqlhelperparametercache.getspparameterset(sqlconnection connection, string spname) 1:    @ sorathesab.mysqlhelperparametercache.getspparameterset(string sectionname, string spname) 1:    @ sorathesab.clscaccop.getlastupdateddate(string sectionname) 1:    @ sorathesab.cacc.page_load(object sender, eventargs e) 1: target site:void permissiondemand()


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