C# LINQ Query to Sum Data Groupby Column?

I have a Data View that contains a DATE Column and a POWER Column. I am filling this data view from an XML file which I get from a particular link and I want to sum the POWER Column Group by "DATE". I use this linq query to get it:

var query = from row in _Hdt.AsEnumerable()
        group row by row.Field<int>("DATE") into grp
        orderby grp.Key
        select new
        {
        DATE = grp.Key,
        Sum = grp.Sum(r => r.Field<decimal>("KW"))
        };

        foreach (var grp in query)
        {
        Console.WriteLine("{0}\t{1}", grp.Id, grp.Sum);
        }
        }

but i am getting errors:

Error   1   Invalid token 'return'开发者_JAVA百科 in class, struct, or interface member declaration    
Error   2   Invalid token ';' in class, struct, or interface member declaration 
Error   3   Expected class, delegate, enum, interface, or struct     
Error   4   Expected class, delegate, enum, interface, or struct     
Error   5   Expected class, delegate, enum, interface, or struct     
Error   6   Identifier expected C:\Documents and Settings\Administrator.MUSEWERX-
Error   7   Expected class, delegate, enum, interface, or struct     
Error   8   Expected class, delegate, enum, interface, or struct     
Error   9   A namespace does not directly contain members such as fields or methods 
Error   10  Type or namespace definition, or end-of-file expected   

I hope for your replies.

The problem is not LINQ query itself but incorrect placing of braces.

Apparently, the compiler decided that your return statement is right inside of the class declaration. Of course you can't return from a class, you can only return from a method.

I can't tell the problem right away because you only posted a piece of your code, however I noticed there are two closing } instead of just one matching foreach—could that be the reason compiler thought method is over?

Create a method which returns an IEnumerable and place your code into it.Do not directly write the code inside the class.

EDIT:

public IEnumerable MethodAmk(){
          var query = from row in _Hdt.AsEnumerable()         
                      group row by row.Field<int>("DATE") into grp         
                      orderby grp.Key         
                      select new {         
                            DATE = grp.Key,         
                            Sum = grp.Sum(r => r.Field<decimal>("KW"))         
            };          
          foreach (var grp in query)         
                {         
                 Console.WriteLine("{0}\t{1}", grp.Id, grp.Sum);         
               } 
          return query;
}