Aggregete function on List using Linq

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C#

ASP.NET

I have a list containg
list<cls> Objlist = new list<cls>();

Obj1.Name="earth";
obj1.code="1"
Obj1.Value = 10;
objlist.add(Obj1);

Obj2.Name="sun";
obj1.code="2"
Obj2.value = 15;
objlist.add(Obj2);

Obj3.Name = "earth";
obj1.code="1"
Obj3.Value = 25;
objlist.add(Obj3);

Obj4.Name = "earth";
obj1.code="1"
Obj4.Value = 35;
objlist.add(Obj4);

Obj5.Name="sun";
obj1.code="2"
Obj5.value = 50;
objlist.add(Obj5);

Now i want to find a sub list using linq which contain,ie sum field contain sum of value group by id.
Obj1.Name="earth";
obj1.code="1"
Obj1.sum= 70;
and
Obj5.Name="sun";
obj1.code="2"
Obj5.sum= 65;
tks in advance