Essential Books

ThenBy

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ThenBy can only be used after a OrderBy clause allowing to order using multiple criteria 

var persons = new[] 
{
    new {Id = 1, Name = "Foo", Order = 1},
    new {Id = 1, Name = "FooTwo", Order = 2},
    new {Id = 2, Name = "Bar", Order = 2},
    new {Id = 2, Name = "BarTwo", Order = 1},
    new {Id = 3, Name = "Fizz", Order = 2},
    new {Id = 3, Name = "FizzTwo", Order = 1},  
};

var personsSortedByName = persons.OrderBy(p => p.Id).ThenBy(p => p.Order);

Console.WriteLine(string.Join(",", personsSortedByName.Select(p => p.Name)));
//This will display : 
//Foo,FooTwo,BarTwo,Bar,FizzTwo,Fizz
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