Get Row Values as Comma Separated String in sql server

create table tbl_name(Name varchar(20))

insert into tbl_name values('adi')
insert into tbl_name values('jc')
insert into tbl_name values('ravi')
insert into tbl_name values('raghu')

DECLARE @name_list VARCHAR(MAX)
SELECT @name_list = COALESCE(@name_list+',' ,'') + Name from tbl_name
SELECT @name_list

OUTPUT

adi,jc,ravi,raghu