Comment Feed for Channel 9 - Understanding and Creating Classes - 14 http://ak.channel9.msdn.com/ch9/d562/3ffa04b2-8173-4733-9638-9f9f000fd562/14VBUnderstandingandCreatingClasses_100_ch9.jpg Channel 9 - Understanding and Creating Classes - 14 Now that you have a good sampling of basic Visual Basic syntax under your belt, it's time to tackle some of the more challenging topics. Classes are integral to the .NET Framework, particularly the .NET Framework Class Library. As a means of better understanding what classes are -- particularly as utilized in the .NET Framework -- we demonstrate how to create your own custom classes. In this lesson we demonstrate how classes are defined and new instances are created. We demonstrate how to define Properties (using the prop "code snippet" to create auto implemented properties) and how to both set their values and get their values for a given instance of the class as well as creating Methods in our classes. We talk about how the classes you create are really custom dat types and can be used as such in helper method declarations and such. Download the source code for Understanding and Creating Classes en Thu, 20 Jun 2013 06:24:28 GMT Thu, 20 Jun 2013 06:24:28 GMT Rev9 Re: Understanding and Creating Classes - 14
i have question about the method inside the class

does it take more memory if i use it in the class camper if its was in the module ?

well in the module it appear once
and the class it appear in all the instances i made

posted by avv

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634582343412487279 Wed, 30 Nov 2011 07:19:01 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634582343412487279 avv Re: Understanding and Creating Classes - 14 posted by David N

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634587093964237563 Mon, 05 Dec 2011 19:16:36 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634587093964237563 David N Re: Understanding and Creating Classes - 14 @avv ... Honestly?  The memory footprint is negligible unless you have a massive massive application.  I would worry about optimizing your application last -- and only make changes once you have determined a baseline of performance and use a profiling tool to determine where the bottle necks are.  Writing your application in a maintainable way should be your first goal.

But these issues are WAY down the line.  You'll get there ... best wishes!

posted by BobTabor

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634587874860489526 Tue, 06 Dec 2011 16:58:06 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634587874860489526 BobTabor Re: Understanding and Creating Classes - 14
Thanks!

posted by Jay

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634647849381685107 Tue, 14 Feb 2012 02:55:38 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634647849381685107 Jay Re: Understanding and Creating Classes - 14 @David N: @Jay: Thank you both for your encouraging words.  Glad this worked for you!

posted by BobTabor

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634648659448999950 Wed, 15 Feb 2012 01:25:44 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634648659448999950 BobTabor Re: Understanding and Creating Classes - 14 posted by connor horton

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634685649228291631 Wed, 28 Mar 2012 20:55:22 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634685649228291631 connor horton Re: Understanding and Creating Classes - 14 Module Module1

Sub Main()
Console.WriteLine("find out how many days you have been alive for: format = 00, 00, 0000 day month year")
Dim mybirthdate = Console.ReadLine()
Dim myage = Date.Now.Subtract(mybirthdate)
Console.WriteLine(myage.TotalDays.ToString())
Console.ReadLine()
End Sub

End Module

posted by connor horton

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634685679352917181 Wed, 28 Mar 2012 21:45:35 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634685679352917181 connor horton Re: Understanding and Creating Classes - 14 Public Property Make() As String

Visual Studio is automatically adding;

Public Property Make() As String
Get

End Get
Set(ByVal value As String)

End Set
End Property

The code won't work unless I define it all through this. Do I need to make anychanges to the code Visual Studio gives me, or o I leave it as it is?

posted by Antonio Moore

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634701833183991279 Mon, 16 Apr 2012 14:28:38 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634701833183991279 Antonio Moore Re: Understanding and Creating Classes - 14
What do we need to do to fix this issue?


Warning 1 Property 'Make' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used. C:\Documents and Settings\mark_fogg\My Documents\Visual Studio 2008\Projects\SimpleClasses\SimpleClasses\Car.vb 6 9 SimpleClasses

posted by M Fogg

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634703675440499856 Wed, 18 Apr 2012 17:39:04 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634703675440499856 M Fogg Re: Understanding and Creating Classes - 14 OK, What we needed to do Antonio, is let it fill in the pseudo code.
 It should only give you a warning.
Everything should then work as advertised.
At least it does for me. I am also running using Visual Studio 2008.

posted by mdfogg

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634704532039760772 Thu, 19 Apr 2012 17:26:43 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634704532039760772 mdfogg Re: Understanding and Creating Classes - 14 I installed the free version of Microsoft Visual Basic 2010 Express and it works fine without adding the code snip-its. 

Otherwise you need to  add them...

Private _make As String
Public Property Make() As String
Get
Return _make
End Get
Set(ByVal value As String)
_make = value
End Set
End Property

posted by mdfogg

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634707985655280981 Mon, 23 Apr 2012 17:22:45 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634707985655280981 mdfogg Re: Understanding and Creating Classes - 14 @connor horton: Your code looks just fine.  Nice work!

@Antonio Moore: @M Fogg: Both styles work, and @mdfogg: is absolutely correct in what he suggests.  The code snippets are merely text macros ... they produce a tiny bit of text in a window that happens to be the code editor.  There are similar programs that could be used across all Windows applications ... text expanders ... in this case, it's merely baked into Visual Studio.  Hope that helps!

posted by BobTabor

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634717386197966660 Fri, 04 May 2012 14:30:19 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634717386197966660 BobTabor Re: Understanding and Creating Classes - 14 example

Public Property Make As String '<--- it shows error then when i hit the return key it should like this.

Public Property Make() As String
Get

End Get
Set(ByVal value As String)

End Set
End Property

Please help me and explain to me why it is like this. i am a newbie but i am fast learner ^_^ i hope your positive response thank you..

P.S Sir 10 stars for all of your videos from 1 to 25 keep it up sir God bless you...

posted by Marc Comia

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634724106849326364 Sat, 12 May 2012 09:11:24 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634724106849326364 Marc Comia Re: Understanding and Creating Classes - 14 example

Public Property Make As String '<--- it shows error then when i hit the return key it should like this.

Public Property Make() As String
Get

End Get
Set(ByVal value As String)

End Set
End Property

Please help me and explain to me why it is like this. i am a newbie but i am fast learner ^_^ i hope your positive response thank you..

P.S Sir 10 stars for all of your videos from 1 to 25 keep it up sir God bless you...

posted by Marc Comia

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634724110543968333 Sat, 12 May 2012 09:17:34 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634724110543968333 Marc Comia Re: Understanding and Creating Classes - 14 Great Video

posted by moaneibrahim

]]> http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634800350764766316 Wed, 08 Aug 2012 15:04:36 GMT http://channel9.msdn.com/Series/Visual-Basic-Development-for-Absolute-Beginners/Understanding-and-Creating-Classes-14#c634800350764766316 moaneibrahim