Code
declare @tbname nvarchar(256);
set @tbname=N'dbo.aspnet_Applications';

with fkids as
(
select
object_id(CONSTRAINT_NAME) as FkId,
object_id(UNIQUE_CONSTRAINT_NAME) AS PkId
from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS
)
,realations as
(
select p.parent_object_id as pktableId
,f.parent_object_id as fktableid
,i.pkid,i.fkid
from
fkids i inner join sys.objects p on i.pkid=p.[object_id]
inner join sys.objects f on i.fkid=f.[object_id]

)
,cte as
(
select * from realations where pktableid=object_id(@tbname)
union all
select r.* from cte c join realations r on r.pktableid=c.fktableid
)

select
object_name(pktableid) as pktable
,object_name(fktableid) as fktable
,object_name(pkid) as pk
,object_name(fkid) as fk from cte