c# - Grouping the details of the data into one, price field should be separated by semi-colon -


i have requirement need group data ordernum, price needs consolidated in 1 row separated semi-colon, determined type. can iterating results but, there's better way in linq.

var notebooks = new list<notebook>             {                 new notebook { type = 1, currency = "usd", price = 1000, ordernum = "123" },                 new notebook { type = 2, currency = "usd", price = 2000, ordernum = "123" },                 new notebook { type = 0, currency = "usd", price = 3000, ordernum = "456" },                 new notebook { type = 0, currency = "usd", price = 4000, ordernum = "789" },                 new notebook { type = 4, currency = "usd", price = 5000, ordernum = "753" }              };              var results = r in notebooks                           group r new { r.ordernum } g                           select new                               {                                   currency = g.first().currency,                                   ordernum = g.first().ordernum,                                   price = ???                               };

i'm expecting result of 

currency ordernum price   usd   123   1000; 2000   usd   456   3000   usd   789   4000   usd   753   5000

not sure description how type should used here, form single price line can use string.join:

price = string.join(";", g.select(x => x.price))

and in case running .net version older 4.0, make sure convert second param array:

price = string.join(";", g.select(x => x.price).toarray())

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