check if value already exists

Question

I have dictionary which holds my books:

Dictionary<string, book> books

Book definiton:

class book
{
    string author { get; set; }

    string title { get; set; }
} 

I have added some books to the dictionary.

How can I check if there is a book in the Dictionary that matches the title provided by the user?

Answer 1

books.ContainsKey("book name");