Entity Framework 4.1 : How to do sub query in Select - entity-framework

Question

I am trying to do following using Entity Framework 4.1 Code First:
Select c1,
c2,
(select v1 from table2 where id = c3) as col3
from table1
Any help is really appreciated.
EDIT:
For example, let's say I have two tables in database,
LookupValues [ ID, Code, DescResourceID ]
Resources [ResourceID, Culture, Value ]
DescResourceID and ResourceID are Foreign Keys.
So I want to create a Configuration or mapping for...
public partial class LookupValues
{
public virtual string ID;
public virtual string Code;
public virtual string Description;
}
Description is mapped to subquery as mentioned above.

Answer 1

You can try something like this:
var query = from x in context.Table1
let z = context.Table2
.Where(y => y.Id == c3)
.Select(y => y.V1).FirstOrDefault()
select new
{
C1 = x.C1,
C2 = x.C2,
C3 = z
};

Answer 2

I would create an Entity Model and use LINQ.
I assume you know what LINQ is as you're working with Entity Framework.
Let's assume you have a data structure like the following;
Products and products has (Column1, Column2, Column3)
Categories and Categories key has a Column3 which is equivilant to the Products.Column3
Do the following;
var categories_Column3 = List<Categories>().Select(c => c.Column3 == some value);
var products_Column3_Query = List<Products>().Select(c => c.Column3 == categories_Column3).ToList<value_type_of_column3>();
Of course, this is just some psuedo code, and because I want to make sure you get the hang of LINQ and realize you can do what you want in LINQ using Entity Framework as it's OR/M I will now point you to the following site, which should give you a thorough tutorial on LINQ.
http://weblogs.asp.net/scottgu/archive/2007/05/19/using-linq-to-sql-part-1.aspx
Hope this helps!
Happy Coding! ;)