Hello , please at this sample : Employee [] employees = Employee .GetEmployeesArray(); EmployeeOptionEntry [] empOptions = EmployeeOptionEntry .GetEmployeeOptionEntries(); var employeeOptions = employees.Join( empOptions, // inner sequence e => e.id, // outerKeySelector o => o.id, // innerKeySelector (e, o) => new // resultSelector { id = e.id, name = string .Format( "{0} {1}" , e.firstName, e.lastName), options = o.optionsCount }); when I see the parameter of " Join " Method , the first parameter
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