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asynchronous call for data population in user control

Posted By:      Posted Date: October 13, 2010    Points: 0   Category :ASP.Net

i have a user control in which i want  to populate a drop down on blur event of text box asynchronously.. i tried with page method but it gives error as method is undefined.. then i tried with writing a web service..
and called a web service method in javascript on user control.. this also gives the same error as method is undefined...project is using master pages.. so the script manager is registered in master page..
so i added service reference as

ScriptManager sm = ScriptManager.GetCurrent(this.Page);
            sm.Services.Add(new ServiceReference("../Controls/MeetingTime.asmx"));

in user control...

below is my javascript call..

function getMeetingTime()
       var uclcmbUserId = document.getElementById('<%= uclcmbActiveClients.ClientID %>'+'<%= uclcmbActiveClients.ActualComboId%>');       

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