c# - Why the LINQ method `Where` in my code is wrong for string[]? -

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.net 3.5

i simple linq operation:

using system.linq; ... /* extract product key. i.e. "acad-7001:  * 409" "software\autodesk\autocad\r17.2\acad-  * 7001:409". ignore last '\' char if   * exists. */ string product_code = subkey_name.split('\\').where     (n -> n != string.empty).last();

but compilation error:

enter image description here

hm... in code use linq-method where. whot wrong?

instead of 

where     (n -> n != string.empty)

use 

where     (n => n != string.empty)

(so replace -> => correct syntax)

but i'd prefer this:

.where(n => !string.isnullorempty(n))

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