How to use select column in XML exist node condition in SQL serve

This is my query

select distinct ItemId,X.Y.value('./@Name', 'VARCHAR(200)')  from ItemExt e
CROSS APPLY e.ItemCustomPropertyXmlData.nodes('ExtendedProperties/Property') as X(Y)
where cast(ItemCustomPropertyXmlData as xml).exist('/ExtendedProperties/Property[@Name eq "'+X.Y.value('./@Name', 'VARCHAR(200)')+'"]') = 1

After executing above query getting "The argument 1 of the XML data type method "exist" must be a string literal" error