Minumum value of a list isn't compariable with a double value

if (b.B开发者_开发知识库ooksList[ID].BookPrices.Min== b.BooksList[ID].BookPrices[i])

cannot be compared. BookPrices[] is a list of doubles.

Error: Error 11 Operator '==' cannot be applied to operands of type 'method group' and 'double'

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You forgot the parenthesis on your call to Min().

Whenever the words "method group" appear in an error message, it's time to go looking for missing parenthesis on a function call.

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Try

if (b.BooksList[ID].BookPrices.Min()== b.BooksList[ID].BookPrices[i])