🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

New No-Code Track! 🚀start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
  • Larry Davis
    Larry Davis
    6,007 Points

    What does this mean? Segmentation fault (core dumped)

    Posted April 23, 2019 3:34pm by Larry Davis
    Larry Davis
    6,007 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    4 Answers

  • Kevin Gates
    Kevin Gates
    15,053 Points

    FYI: Number of Birds (and Sightings) are different in the WorkSpace vs. Video.

    Posted January 3, 2019 1:36pm by Kevin Gates
    Kevin Gates
    15,053 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • How Much Data Do We Have?

    2 Answers

  • okilydokily
    okilydokily
    12,105 Points

    I wish there was an explanation for where the key in grp.Key comes from?

    Posted November 2, 2018 6:51am by okilydokily
    okilydokily
    12,105 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • How Much Data Do We Have?

    0 Answers

  • Daniel Breen
    Daniel Breen
    14,943 Points

    Select vs SelectMany When Getting Average

    Posted June 14, 2018 12:44am by Daniel Breen
    Daniel Breen
    14,943 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • How Much Data Do We Have?

    1 Answer

  • Alan Mills
    Alan Mills
    31,712 Points

    struggling with the syntax.

    Posted December 28, 2017 12:37pm by Alan Mills
    Alan Mills
    31,712 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    1 Answer

  • Radu - Adrian Buha
    PLUS
    Radu - Adrian Buha
    Courses Plus Student 5,535 Points

    Dumm question, how do you write it correctly : link or linq?

    Posted December 10, 2017 9:29am by Radu - Adrian Buha
    Radu - Adrian Buha
    Courses Plus Student 5,535 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Importing

    1 Answer

  • Radu - Adrian Buha
    PLUS
    Radu - Adrian Buha
    Courses Plus Student 5,535 Points

    Is there a better Workspace Alternative?

    Posted December 8, 2017 10:37am by Radu - Adrian Buha
    Radu - Adrian Buha
    Courses Plus Student 5,535 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • How Much Data Do We Have?

    4 Answers

  • Ole Vølund Skov Mortensen
    Ole Vølund Skov Mortensen
    27,842 Points

    where are the link to LiNQ to SQL?

    Posted August 8, 2017 5:12pm by Ole Vølund Skov Mortensen
    Ole Vølund Skov Mortensen
    27,842 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Some Final Advice

    1 Answer

  • Nathan Yebgui
    Nathan Yebgui
    15,732 Points

    a much easier way

    Posted July 24, 2017 10:47am by Nathan Yebgui
    Nathan Yebgui
    15,732 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Sightings of Endangered Birds

    1 Answer

  • Amy Shah
    Amy Shah
    25,337 Points

    Problem with understanding how the public static bool method is supposed to work here

    Posted March 10, 2017 10:45pm by Amy Shah
    Amy Shah
    25,337 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    2 Answers

  • Emilio Meira
    Emilio Meira
    11,059 Points

    Problems on the Linq query

    Posted February 22, 2017 9:19pm by Emilio Meira
    Emilio Meira
    11,059 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    1 Answer

  • Elshad Shabanov
    Elshad Shabanov
    2,890 Points

    In my test, Concat + Distinct is way faster than Concat alone or Union

    Posted February 15, 2017 10:57am by Elshad Shabanov
    Elshad Shabanov
    2,890 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Which is Faster? Union versus Concat

    2 Answers

  • Samuel Ferree
    Samuel Ferree
    31,722 Points

    Is join overly verbose in this instance?

    Posted December 27, 2016 9:04pm by Samuel Ferree
    Samuel Ferree
    31,722 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Search Extension

    1 Answer

  • Maurice Abney
    PLUS
    Maurice Abney
    Courses Plus Student 9,859 Points

    Answer not correct

    Posted December 14, 2016 4:40pm by Maurice Abney
    Maurice Abney
    Courses Plus Student 9,859 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    2 Answers

  • David Batton
    David Batton
    10,383 Points

    LINQ list of strings in a string

    Posted November 21, 2016 7:23pm by David Batton
    David Batton
    10,383 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    5 Answers

  • Dan Whiting
    Dan Whiting
    12,661 Points

    Extension method challenge

    Posted November 4, 2016 2:03pm by Dan Whiting
    Dan Whiting
    12,661 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    1 Answer

  • Daniel Hildreth
    Daniel Hildreth
    16,170 Points

    Program when ran does not return any birds

    Posted October 28, 2016 4:17am by Daniel Hildreth
    Daniel Hildreth
    16,170 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Search In Action

    2 Answers

  • Daniel Hildreth
    Daniel Hildreth
    16,170 Points

    Bird Search In Action Error

    Posted October 27, 2016 6:44pm by Daniel Hildreth
    Daniel Hildreth
    16,170 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Search In Action

    1 Answer

  • David Merk
    David Merk
    9,863 Points

    I'm really struggling with a challenge. This looks right to me. Last Q in Linq :)

    Posted September 30, 2016 6:33pm by David Merk
    David Merk
    9,863 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    2 Answers

  • Kirsty Pollock
    Kirsty Pollock
    14,261 Points

    Brainbending

    Posted July 8, 2016 3:50pm by Kirsty Pollock
    Kirsty Pollock
    14,261 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Sightings of Endangered Birds

    3 Answers

  • Aaron Selonke
    Aaron Selonke
    10,323 Points

    .Contains Method used here

    Posted June 24, 2016 4:09pm by Aaron Selonke
    Aaron Selonke
    10,323 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Search Extension

    2 Answers

  • Aaron Selonke
    Aaron Selonke
    10,323 Points

    Are the Birds in Workspaces the same as in the video?

    Posted June 24, 2016 3:30pm by Aaron Selonke
    Aaron Selonke
    10,323 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Importing

    1 Answer

  • Aaron Selonke
    Aaron Selonke
    10,323 Points

    Why use the Join() to check for duplicates

    Posted June 24, 2016 3:17pm by Aaron Selonke
    Aaron Selonke
    10,323 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Bird Importing

    3 Answers

  • Aaron Selonke
    Aaron Selonke
    10,323 Points

    Querying With Linq Challange

    Posted June 19, 2016 2:32am by Aaron Selonke
    Aaron Selonke
    10,323 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    2 Answers

  • Aaron Selonke
    Aaron Selonke
    10,323 Points

    What was that!

    Posted June 17, 2016 4:45am by Aaron Selonke
    Aaron Selonke
    10,323 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Sightings of Endangered Birds

    1 Answer

  • Dean Wiseman
    Dean Wiseman
    20,901 Points

    Extension Method

    Posted June 15, 2016 4:40pm by Dean Wiseman
    Dean Wiseman
    20,901 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    2 Answers

  • Rohit Gopalan
    Rohit Gopalan
    81,945 Points

    Extension method in Linq

    Posted May 27, 2016 6:00am by Rohit Gopalan
    Rohit Gopalan
    81,945 Points
    • C#
    • Querying With LINQ
    • Querying the BirdWatcher Data
    • Extension Method

    1 Answer

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

    Treehouse

  • About
  • Blog
  • Careers
  • Community
  • Stories
  • Shop
  • Contact
  • Gift Card

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.