Treehouse | Community | The System.Collections.Generic Namespace

💥 2026 New Year's Sale 💥 Take 50% off your first 6 months! (new subscribers only, renews at regular price).

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

Newest
- Newest
- Active
- Unanswered
- Featured
All Topics

evanpavan
5,025 Points
For the previous code challenge I'm stuck at "Bummer: The given key was not present in the dictionary."

Posted February 18, 2019 6:00pm by evanpavan

evanpavan
5,025 Points
1 Answer
Christian Fincher
3,065 Points
NullReferenceException Tower

Posted February 16, 2019 10:03pm by Christian Fincher

Christian Fincher
3,065 Points
3 Answers
Jerome Allen
42,838 Points
DateTime.TryParse is failing about half the time

Posted January 10, 2019 12:46am by Jerome Allen

Jerome Allen
42,838 Points
- C#
1 Answer
Kevin Gates
15,053 Points
Why won't my DataBase Initializer work? (Visual Studio 2017)

Posted January 9, 2019 7:00pm by Kevin Gates

Kevin Gates
15,053 Points
3 Answers
Prasanth Rv
4,205 Points
how to initialize a string?

Posted January 7, 2019 5:11pm by Prasanth Rv

Prasanth Rv
4,205 Points
1 Answer
<noob />
17,063 Points
some questions about what is the use of namespaces

Posted November 18, 2018 8:50pm by <noob />

<noob />
17,063 Points
4 Answers
Akshay Mehta
1,831 Points
It will not let me assign a variable to a type I made through a class

Posted November 13, 2018 10:44pm by Akshay Mehta

Akshay Mehta
1,831 Points
- C#
2 Answers
Akshay Mehta
1,831 Points
In my C# workspace I select C#, make a name, but then it will not let me select a c# template, it is grayed out. Why?

Posted November 13, 2018 3:35am by Akshay Mehta

Akshay Mehta
1,831 Points
- C#
0 Answers
PLUS

Chris Gauthier
Courses Plus Student 6,434 Points
Whats up with this?

Posted November 12, 2018 8:02pm by Chris Gauthier

Chris Gauthier
Courses Plus Student 6,434 Points
1 Answer
okilydokily
12,105 Points
This video was really confusing because you don't explain what a key is.

Posted November 1, 2018 11:04pm by okilydokily

okilydokily
12,105 Points
2 Answers
Shoko Ishigaki
21,826 Points
When to throw an exception?

Posted October 30, 2018 11:45am by Shoko Ishigaki

Shoko Ishigaki
21,826 Points
- C#
- Wrapping Up
2 Answers
Pratham Patel
565 Points
Could someone explain to me all the different versions of ASP.NET

Posted October 18, 2018 9:36pm by Pratham Patel

Pratham Patel
565 Points
- C#
2 Answers
Jim Conachan
2,514 Points
Try/Catch exercise.

Posted October 18, 2018 5:43pm by Jim Conachan

Jim Conachan
2,514 Points
- C#
- C# Basics (Retired)
- Perfect
- Final
1 Answer
Zachary Eckstein
9,901 Points
Error when trying to write a For loop: 'not all code paths return a value'

Posted October 3, 2018 2:55pm by Zachary Eckstein

Zachary Eckstein
9,901 Points
1 Answer
Thaedra Brondum
1,648 Points
After the first video of Console I/O and before the quiz is an "Objective" but nothing shows. What do I do for this?

Posted October 3, 2018 3:57am by Thaedra Brondum

Thaedra Brondum
1,648 Points
1 Answer
kal alben-mccave
9,556 Points
Is C# the Language I should learn to build my Trading Software

Posted September 27, 2018 12:53am by kal alben-mccave

kal alben-mccave
9,556 Points
- C#
3 Answers
Richard Miles
10,964 Points
I'm totally lost here.. Any ideas?

Posted September 19, 2018 10:47pm by Richard Miles

Richard Miles
10,964 Points
2 Answers
Erich Freimann
1,047 Points
error CS0019: Operator `+' cannot be applied to operands of type `int'

Posted September 18, 2018 10:43am by Erich Freimann

Erich Freimann
1,047 Points
1 Answer
Simbarashe Forbes Mutombodzi
2,170 Points
how do you declare a string variable named booktitle

Posted September 3, 2018 10:12am by Simbarashe Forbes Mutombodzi

Simbarashe Forbes Mutombodzi
2,170 Points
1 Answer
Ankit Biswas
280 Points
Average

Posted August 31, 2018 5:37am by Ankit Biswas

Ankit Biswas
280 Points
1 Answer
Sassafras Finley
13,168 Points
Unable to start program...not a valid working directory.

Posted August 30, 2018 5:43pm by Sassafras Finley

Sassafras Finley
13,168 Points
- C#
3 Answers
Ali Dahud
3,459 Points
Bummer: Did you initialize the field 'numSides' to 4 in the base constructor? Why?

Posted August 29, 2018 2:08pm by Ali Dahud

Ali Dahud
3,459 Points
- C#
- C# Objects
- Inheritance
- Inheritance
2 Answers
Ali Dahud
3,459 Points
Can you explain to me in more depth?

Posted August 25, 2018 10:58am by Ali Dahud

Ali Dahud
3,459 Points
- C#
1 Answer
Mark Ramos
19,209 Points
Initialize Interactive with Project

Posted July 9, 2018 7:38pm by Mark Ramos

Mark Ramos
19,209 Points
2 Answers
PLUS

Carlos Pizarro
Courses Plus Student 1,878 Points
C# Objects 3 - Using the keyword base (I simply do not get it)

Posted May 30, 2018 4:15am by Carlos Pizarro

Carlos Pizarro
Courses Plus Student 1,878 Points
- C#
- C# Objects
- Inheritance
- Inheritance
4 Answers
Lee Puckett
12,539 Points
I'm having trouble with this challenge. I tried to follow the advice offered on a couple posts, but still get an error

Posted September 27, 2017 4:54pm by Lee Puckett

Lee Puckett
12,539 Points
1 Answer
Daniel Tkach
7,608 Points
No \r, only \n

Posted April 14, 2017 1:08am by Daniel Tkach

Daniel Tkach
7,608 Points
4 Answers
mehmet odabas
2,120 Points
compiler error in if else statement

Posted November 21, 2015 11:46am by mehmet odabas

mehmet odabas
2,120 Points
2 Answers

Prev Page 271 of 638 Next

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