c# - LINQ - query does not return an object from a list of objects -

i have list of objects , need execute linq query on find specific object.

class myclass {      int id;     int someotheridbutnotunique; }  var ls = myobjectlist.where(x => x.id==specificid                            && x.someotheridbutnotunique == someotherspecificid)                      .firstordefault(); 

but query not return myclass object. , also, how should change query list of myclass objects fulfill given condition. @ same time, know if there linq tutorial can start scratch.

linq extension methods take predicates filter list by. where, first, firstordefault, single, singleordefault (to name few) take same predicate.

some lambda expression filter list by.

public class myclass {     public int id {get;set;}     public int other {get;set;} }  // myclasses populated list <-- needs checked. var result = myclasses.firstordefault(x => x.id == specificid && x.other == specificother); 

result should contain either single myclass instance or null.

if omit ordefault() code throw error if can't find instance matches predicate.

if predicate returns several items, first pick first item. if swap first single , predicate returns several items, throw exception.

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things check

1. the list performing query against has list of instances.

2. the variables specificid , specificother have values exist in list. last thing want wondering why isn't returning anything, when doing asked , reason failing values using query wrong.