Creating a string from a generic list

I'm trying to create a string from the values in a list; what I am trying to achieve is the SQL syntax which is used in an update query:

UPDATE TABLE SET COLUMN1 =X WHERE COLUMN2 IN ('A','B','C')

(A,B,C are items in my list.) How can I achieve this?

I tried:

string commaSeparatedList = _list.Aggregate((a, x) => a + ", " + x);

but it creates the list without the apostrophes.

You can also use String.Join Method instead:

string commaSeparatedList = string.Join(",", _list.Select(s => "'" + s + "'"));

If your code gives you exactly what you want except for the apostrophes, just stick a

.Select(s => "'" + s + "'")

between _list .and .Aggregate...