c# - Why does BadRequest(ModelState) return Status Code 500? -


i have web api controller turning return badrequest(modelstate) if fails modelsatate.isvalid check so.

if(modelstate.isvalid) {     return badrequest(modelstate); }

but why response code 500 , not 400? if return badrequest() without modelstate, 400. 

if(modelstate.isvalid) {     return badrequest(); }


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