how to read multiple rows and check the checkbox based on

Question

I have a Page in which  i am assigning Cities to User The user Table is like that (userID(Primary),Name,City(Foreign_Key),Email) 

one user can have multiple cities for that purposes i made another table with name UserCities(Recordid(P),City(Foreign key),User_ID(Foreign_KEY ) 

UserID	City	Email
1	1	[email protected] m

The Cities are present in their own table like   

(CityID(P),CITYName) 

CITY ID(P)	NAme
1	A
2	B
3	C

 The UserDistrict Table is having UserID(foreignkey) and CityID(foreignkey)

RecordID(P)	UserID(Foreign)	CITY_ID(ForeignKey)
1	1	1
2	1	2
3	1	3

Now I am saving these records and I have Checkboxlist for showing the cities on edit how i show the checkbox checked based on UserDistrict Table , I am asking how i am reading multiple rows and make the check box checked .