How Can I get Object Properties from within an Object Anonymous type in C# from LINQ to Entities Query

Question

Lets say I have an method which returns an object. I return a new object which contains two properties Sum and Count. When I call this method, How can I retrieve these properties?

public static object SomeMethod(){
   using (var context = new MappedTableEntities()){
      return from x in context.SomeMappedTable
                   group x by 1 into g
                   select new
                   {
                       Count = g.Count(),
                       Sum = g.Sum(col => col.someSummableColumn)
                   };
       }
}

when I call this function:

var obj = SomeClass.someMethod();

I do not see the properties exposed and I get a compiler error when I try to retrieve them. How can I expose these members?

/*ERROR */
var count = obj.Count;
var sum = obj.Sum;