Delete WHS Mobile Device Portal User Session in AX2012

lookup

public void lookup(FormStringControl _control)
{
    Query                 query = new Query();
    QueryBuildDataSource  queryBuildDataSource;
    SysTableLookup        sysTableLookup = SysTableLookup::newParameters(tableNum(WHSWorkUserSession), 
                                                                         _control);

    sysTableLookup.addLookupField(fieldNum(WHSWorkUserSession, UserId));
    sysTableLookup.addLookupField(fieldNum(WHSWorkUserSession, InventLocationId));
    sysTableLookup.addLookupField(fieldNum(WHSWorkUserSession, LastActionDateTime));
    queryBuildDataSource = query.addDataSource(tableNum(WHSWorkUserSession));
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}