How to convert the column data to comma separated in Single Row IN SQL

I have a table "sampledata"  with data like


id    city
1     Pune
2     Banglore
3    Mumbai
4    Nagpur


------------------------------------
DECLARE @list nvarchar(max)

SELECT @list = COALESCE(@list + ', ', '') + CAST(city AS varchar(100))
FROM sampledata

SELECT @list as List


-----------------------Output----------------

 Pune, Banglore, Mumbai, Nagpur


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