c# - Lambda Except Placement -

i want return list of lans , want exclude userinformation.globals.lanid list.

code:

var lanlist = _context.corp_matrixpositionoldway                .where(x => x.childorglevel.startswith(parentorg.tostring()))                .select(x => x.childlan)                .except(userinformation.globals.lanid); 

error:

'iqueryable' not contain definition 'except'

i think want exclude single childlan, use where:

var lanlist = _context.corp_matrixpositionoldway            .where(x => x.childorglevel.startswith(parentorg.tostring()))            .select(x => x.childlan)            .where(lan => lan != userinformation.globals.lanid);