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Answer 1

+8 A:

System.Collections

System.Data (many apps have a database backend)

System.Windows (as it's a desktop app)

System.Graphics (as above)

System.Diagnostics (provides various objects and methods useful for logging and when debugging, always important in commercial code).

These namespaces contain important classes to do a lot of everyday stuff done in most applications, regardless of whether the app is web or desktop based. Windows is pretty much just for desktop apps (like you said you do), and graphics will compliment that closely (also compliments web apps too). You'd do well to learn all the classes in these namespaces, even though you asked for just classes.

dotnetdev 2009-01-13 23:16:35

Thanks. It was helpful.

Alex Baranosky 2009-01-13 23:23:00

System.Collections.Generic is much more important than System.Collections.

configurator 2009-01-13 23:32:45

Did you mean System.Drawing? I am not finding System.Graphics on msdn.com

Alex Baranosky 2009-01-13 23:33:31

GordonG: I'm not sure if System.Drawing is a core namespace as it is not supported at all in ASP.NET or Windows Services (it will work though, but it's not stable)

DrJokepu 2009-01-14 01:03:59

I think it may have been System.Graphics.Drawing. I will have to check that. Also, I mean core in terms of likelihood of use in a desktop app, not core in most important in the Framework or most relied upon by the framework (e.g. many methods return or ask for a collection of some sort).

dotnetdev 2009-01-14 01:05:42

Also, if it is System.Drawing, you might need to add a reference. Can't remember exact path. When I say "most important in the Framework" I really mean most fundamental.

dotnetdev 2009-01-14 01:12:20

Answer 2

+1 A:

For desktop applications, I would add to GSS comment : System.Windows.Forms. These classes are the base for desktop development.

Best wishes, Sylvain.

Sylvain 2009-01-13 23:28:32

Answer 3

A:

StringBuilder is a very important class.

Basically when you want to do lot of dynamic string concaternation with + operator, what you really want to do is to use StringBuilder.

Krzysztof Koźmic 2009-01-13 23:31:46

But only use a StringBuilder when you have a significant amount of string concatenation going on...

Mitch Wheat 2009-01-13 23:34:00

Seconded; there is nothing wrong with `a + b + c + d + e` - the compiler uses string.Concat for you. You generally use StringBuilder when you are appending in a loop.

Marc Gravell 2009-01-13 23:42:35

Jon Skeet has very good article when to use StringBuilder (http://www.yoda.arachsys.com/csharp/stringbuilder.html), and based on it your example is bad.

Sunny 2009-01-14 00:27:52

All of which doesn't detract from the **correct** statement: "StringBuilder is a very important class."; it is just the example that is wrong. I think -3 is unfair for this...

Marc Gravell 2009-01-14 07:37:44

Answer 4

+2 A:

System.Collections

System.Collections.Generic

System.IO

System.Diagnostics

Mitch Wheat 2009-01-13 23:36:19

Answer 5

+2 A:

System.Text anyone?

That is one of the most important, at least for me, you will need it to perform basic operations on text such as convert text between encodings...

Gustavo Rubio 2009-01-14 01:12:43

Answer 6

+2 A:

Just found this link in another thread: map

Also, download Reflector and browse through the .NET Framework classes, starting with mscorlib.dll and System.dll.

2009-01-14 09:08:12

I love the poster. I plan to examine all of the namespaces and classes on there.

Alex Baranosky 2009-01-17 06:15:39

Answer 7

A:

I can suggest the following :

System.Windows.Form
System.Windows.FileDialog
System.Windows.Forms.MDIClient
System.Windows.Forms.MessageBox
System.XML.XMLDocument
System.XML.XMLNodeReader
System.XML.XMLReader
System.Drawing.Text
System.Collections.*
System.Diagnostics.Trace/Debug
System.Configuration.* - System.Component.ComponentModel
System.Text.*
System.Timers.Timer
System.Data.*

Codex 2009-01-14 10:16:02

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