c# - Linq query with group by retrieving percentage -

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i have calculate percentage in group clause. more in depth need calculate percentage of controlforms have status = 'false'. status in table checkresult.

var items = (from controlform in datacontext.controlforms              join controlformstatus in datacontext.controlformstatus on controlform.fk_controlformstatus equals controlformstatus.id              join doccheck in datacontext.documentchecks on controlform.id equals doccheck.fk_controlform              join checkresult in datacontext.checkresults on doccheck.fk_checkresult equals checkresult.id              controlform.fk_controlcycle.tostring().equals(controlcycleid) & (              controlformstatus.description.equals(constants.controlformstatustestcontrolowner)              | controlformstatus.description.equals(constants.controlformstatusapprovalprocessowner))              group controlform new { controlform.id, controlform.fk_controlcycle, controlform.fk_samplenode, controlform.fk_control, /*function*/} ctrlform                          select new controlformreportpartialresults(ctrlform.key.id, ctrlform.key.fk_controlcycle, ctrlform.key.fk_samplenode, ctrlform.key.fk_control, valuefunction));

can suggest me have istead of /function/? or if there way solve problem? welcome!

thanks in advance, dario zanelli

replace "collection" appropriate variable containing items want calculate percentage for:

collection.select(item => item.status == false).count() / collection.count() * 100

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