Linq selecting multiple columns when using anonymous types using Sum multiple columns

Question

I have a list with multiple columns where I need to sum a list of columns for each row into a new column (not 100% sure if there is another way to sum other than I have done it). Problem I'm having is being able to select more than just column I'm creating
used from summing the other column and the Key. Below will produce a row with the CustomerId and the total of all the months.
CustomerId
Total
12345
2500.00
12346
3000.00
But let's say I have a row called Name in "history"--how can display it in the query results as below.  I'm unable to reference anything but the key.
CustomerId
Total
Name
12345
2500.00
John Smith
12346
3000.00
May Allen
var list = history
.GroupBy(g => g.CustomerId)
.Select(sg =>
new
Key = lg.Key,
SumTotal = sg.Sum(x => x.month_01)
+ sg.Sum(x => x.month_02)
+ sg.Sum(x => x.month_03)
+ sg.Sum(x => x.month_04)
+ sg.Sum(x => x.month_05)
+ sg.Sum(x => x.month_06)
+ sg.Sum(x => x.month_07)
+ sg.Sum(x => x.month_08)
+ sg.Sum(x => x.month_09)
+ sg.Sum(x => x.month_10)
+ sg.Sum(x => x.month_11)
+ sg.Sum(x => x.month_12)

Answer 1

Hi
ajl7519,
I have tested on my side,  please check my code. 
InitializeComponent();
AuctionItems = new List<AuctionItem>() {
new AuctionItem() { Category = "Car", CurrentPrice = "100", Description = "100", SpecialFeatures = "100", StartDate = 1, StartPrice = 1 },
new AuctionItem() { Category = "Car", CurrentPrice = "100", Description = "100", SpecialFeatures = "100", StartDate = 2, StartPrice = 2 },
new AuctionItem() { Category = "Car", CurrentPrice = "100", Description = "100", SpecialFeatures = "100", StartDate = 3, StartPrice = 3 }
var resu = AuctionItems.GroupBy(a => new { a.Category, a.Description }).Select(sg => new { ID = sg.Key.Category, Total = sg.Sum(oc => oc.StartPrice + oc.StartDate), Name = sg.Key.Description });
 You also can change your code to
• SumTotal = sg.Sum(x => x.month_01+x.month_02+ ......)
Have a nice day !
Kristin
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