Question

I need cities count for each state and all columns of states table in select result set.
I have TSQL query but dont know how to tackle inner query and grouping in LINQ.

States Table

StateID,StateName,Description,Address,SectionName

Cities Table:

CityID,StateID,Address,Description

Here is TSQL query need to be converted to LINQ

declare @State varchar(100)
set @State='IL'

SELECT s.*,oCities.CityCount
from ( 
        Select c.StateID,count(*) CityCount
        from States s inner join Cities c on 
        s.StateID =c.StateID 
        where s.StateName =@State
        group by c.StateID 
    ) oCities inner join States s on oCities.StateID = s.StateID 
where s.StateName =@State

Preferably in C# language but any help will be appreciated

Answer 1

Assuming your foreign keys have been defined and imported correctly then something like this should work

var state = states.Where (s => s.StateName == name).Select (
    s => new {State=s, CityCount=s.Cities.Count()}).SingleOrDefault ();

Using Linq to SQL this translates as

SELECT [t2].*, [t2].[value] AS [CityCount]
FROM (
    SELECT [t0].*, (
        SELECT COUNT(*)
        FROM [City] AS [t1]
        WHERE [t1].[StateId] = [t0].[Id]
        ) AS [value]
    FROM [State] AS [t0]
    ) AS [t2]
WHERE [t2].[StateName] = @p0

where p0 is your @state parameter.