Untitled

Data transfer object with O(1) lookup
public class DTO
{
    string name;
    int id;
    int schoolId;
    double value;
}

DtoList.Where(x=>x.name="name" && x.id=1 && x.schoolId=2).First();

struct Key
{
    string Name;
    int Id;
    int SchoolId;
}

class DictionaryObject
{
   IDictionary<Key, double> _dict;

   public DictionaryObject(IEnumerable<Dto> dtoList)
   {
      _dict = dtoList.ToDictionary(
             o => new Key { Name = o.Name, Id = o.Id, SchoolId = o.SchoolId },
             o => o.Value);
   }

   double GetValue(string Name, int Id, int SchoolId)
   {
      // if the key exists then...
      return _dict[new Key { Name = Name, Id = Id, SchoolId = SchoolId }];
   }

   ...
}