I am using Flickr API for retrieving user image for my school project.
I have used search-box to fetch image using key-words which user enters, for adding extra features I want to display images of user by default, for that I need to get users id but I am not getting.
There is a Flickr C# library that may be of interest for you. It's called FlickrNet and comes with source code to some example applications.
Also, have a look at this Flickr API wrapper for C#. It's a light-weight class that helps you perform some basic functionality such as retrieving user sets and info about user photos in a set.