Abstract, interface, Confusion - C# Discussion Boards

Urs Enzler5-Sep-07 3:00

5-Sep-07 3:00

1) either set the DataSource property of the GridView to your Dataet or (better) use an DataSource approach (see MSDN for that).

2) register the RowBound event of the GridView

3) set CssClass of row depending on your data

4) write the CSS styles

by the way: MSDN would have been a good source of information, too.

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no risk no funk ................... please vote ------>

Assaf825-Sep-07 4:50

Assaf82

5-Sep-07 4:50

can you claify your answer please

Thanks

Assaf

Urs Enzler5-Sep-07 4:55

5-Sep-07 4:55

I think I gave you enough buzz words to go to google or the msdn and find the details of your own.

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no risk no funk ................... please vote ------>

Assaf825-Sep-07 9:53

Assaf82

5-Sep-07 9:53

for coloring each row ???
but i didn't saw this idea before !
I'll seach for this anyway ???

Thanks

Assaf

Urs Enzler5-Sep-07 20:14

Abstract, interface, Confusion

5-Sep-07 20:14

protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
     e.Row.CssClass = /* some rule */
}

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no risk no funk ................... please vote ------>

Intel UPnP SDK

MicealG5-Sep-07 2:41

MicealG

5-Sep-07 2:41

Can anyone point me in the direction of some examples of the implementation of the Intel UPnP SDK. According to a post I found Intel haven't released any documentation about it because they consider it to be a support DLL and nothing more.

Freedom is the right to say that 2+2=5 if this is so everything else will follow.

Word Addins

som84835-Sep-07 2:20

som8483

5-Sep-07 2:20

Hi,
I need to create and Ms-Word addin that will add a footer to all the pages of an open document. I have browsed and got some code.

I have referred MS knowledgebase article and have created an addin, but that code is not adding any button to the commandbar of Word. It did one for outlook. When I made some changes to the code to make it word specific, it still didn't do anything. I have written the following code in OnStartupComplete method:

object oMissing=System.Reflection.Missing.Value;

CommandBars cmdBar = wordApp.ActiveDocument.CommandBars;

try

{

this.myButton = (CommandBarButton)cmdBar["Tools"].Controls.Add(1, oMissing, oMissing, oMissing, oMissing);

}

catch

{

this.myButton = (CommandBarButton)cmdBar["Tools"].Controls.Add(MsoControlType.msoControlButton, oMissing, oMissing, oMissing, oMissing);

this.myButton.Caption ="Hello";

this.myButton.Style=MsoButtonStyle.msoButtonCaption;

}

this.myButton.Tag ="Hello Butom";

this.myButton.OnAction="MyAddin1.Connect";

this.myButton.Visible =true;

this.myButton.Click += new _CommandBarButtonEvents_ClickEventHandler(this.myButton_Click);

But this is not working. I am also not able to debug it.

Please help!!!!

Vodstok5-Sep-07 2:19

Re: Abstract, interface, Confusion

5-Sep-07 2:19

I have been reading a lot lately about how Interfaces and abstract classes are hallmarks of good C# programming. I admit, they are interesting, but my understanding is very limited as to why one would use either instead of simply creating a reusable class.

I have been programming for a long time, but have never needed either, but I will be the first to admit that much of my code in the past could have been done better.

SoI guess my question is, what circumstances would I use either an interface or an abstract class, and why would this benefit me?

______________________
Mr Griffin, eleventy billion is not a number... WTF | :WTF:

Urs Enzler5-Sep-07 2:56

Re: Abstract, interface, Confusion

5-Sep-07 2:56

1) A class in c# can derive from one class and can implement as many interfaces as it wants.

2) an abstract class contains abstract methods and normally at least one non-abstract method. They are used if there exists a common behaviour (non-abstract methods) and methods that can only be implemented by derived classes (abstract methods).

3) interfaces are used to define an Interface that means it describes what some object can do.

4) you can look at an interface as a class containing only abstract methods

5) because you can not have multiple inheritance in c#, interfaces are used instead.

A good object oriented base idea is that you always program against an interface and never against a class. This simplifies loose coupling of components a lot as well as it allows the replacement of an instance implementing a certain interface with another (good in testing with mocks for example) or if your code has several strategies to handle something that can be exchanged (strategy pattern).

I'm stopping now, it's going loooong.

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no risk no funk ................... please vote ------>

Vodstok5-Sep-07 3:19

Re: Abstract, interface, Confusion [modified]

5-Sep-07 3:19

So, essentially, they are there to make things easier and cleaner (kind of like XHTML), it isnt really ever necesarry, but is, as a rulle, good practice. Right?

______________________
Mr Griffin, eleventy billion is not a number... WTF | :WTF:

Urs Enzler5-Sep-07 3:25

Re: Abstract, interface, Confusion

5-Sep-07 3:25

If you want, then yes.

But necessary is only machine code, everything else is to make things easier and cleaner:
- assembler
- IL
- C#
- interface, classes
- patterns

Laugh | :laugh:

-- modified at 9:36 Wednesday 5th September, 2007

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no risk no funk ................... please vote ------>

Larantz5-Sep-07 9:05

Larantz

5-Sep-07 9:05

There's also the benefits of using Interfaces as contracts for communication through .NET Remoting.
If the server exposes an Interface, the clients don't have to know the inner workings that's going on on the serverside.

-Larantz-

for those about to code, we salute you
http://www.itverket.no

use math.h in C#

max_dev2006@yahoo.com5-Sep-07 1:35

max_dev2006@yahoo.com

5-Sep-07 1:35

Hi friends,
I have some code in C which I need to convert in C#. The very first line of C code is an Include file. So how can I convert this line in C# code or what is the equivalent of this in C#? I have already tried system.math class but I want to convert this particular in C#.
#include <math.h>

max dev

Re: use math.h in C#

Nouman Bhatti5-Sep-07 1:38

Nouman Bhatti

5-Sep-07 1:38

u can't use .h file
i think u have to convert it into class library then u can use it

Re: use math.h in C#

max_dev2006@yahoo.com5-Sep-07 19:25

max_dev2006@yahoo.com

5-Sep-07 19:25

Thanks so much for your reply. Can you tell me how can I convert it in system library ? or can you suggest any source or converter where I can convert my C Code into C# ?

max dev

Re: use math.h in C#

blackjack21505-Sep-07 1:47

blackjack2150

5-Sep-07 1:47

You'll have to use the corresponding methods of System.Math and do some manual labor to adapt your C code.

Cannot take the address or size of a variable of a managed type

Vikas Salvi5-Sep-07 1:32

Vikas Salvi

5-Sep-07 1:32

hi all,

following is a structure that i hv define

[StructLayout(LayoutKind.Sequential, Size = 16)]
public struct MESSAGE_INFO
{
public UInt16 _MessageCode;
public UInt16 _ChannelNo;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=6)]
public UInt16[] _Parameter;
}

Now when i declare pointer to this structure, It throws the error "Cannot take the address or size of a variable of a managed type"

MESSAGE_INFO* ptrMsgInfo

But if i declare "public UInt16[] _Parameter" as only "public UInt16 _Parameter" then it compiles perfectly.
Any light on this would be highly appreciated...
Thanx in advance

Vikas Salvi

Programmer Analyst

Re: Cannot take the address or size of a variable of a managed type

TJoe5-Sep-07 8:41

TJoe

5-Sep-07 8:41

Hello Vikas,

MSDN[^] says (at the top of the page) that the pointer can point to "Any user-defined struct type that contains fields of unmanaged types only". When you define the field as an array, then it's considered a managed type. When you define it as just a UInt16, then it's considered an unmanaged type (sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, decimal, or bool).

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

How to create new file

Hum Dum5-Sep-07 1:26

Hum Dum

5-Sep-07 1:26

How can we create a new file in a selected folder.
also is there any kind of limitation on file type( file format) which we can create.

I want to create a new file in whichever folder a user chooses?

originSH5-Sep-07 1:37

originSH

5-Sep-07 1:37

File.Create?

I mean seriously ... how hard is google to use?

http://www.google.co.uk/search?hl=en&q=c%23+create+file&btnG=Google+Search&meta=[^]

Knowing how to research something is probably one of the best skills you can have as a programmer and it'll save your arse.

Vodstok5-Sep-07 2:00

5-Sep-07 2:00

Sometimes its not what you search, for but how. Not knowing how to word a proper search is pretty common, even among professionals.

______________________
Mr Griffin, eleventy billion is not a number... WTF | :WTF:

originSH5-Sep-07 3:19

originSH

5-Sep-07 3:19

WHich is worrying ... they should atleast be able to do "c# a few keywords" X(

Vodstok5-Sep-07 3:20

It's quite embarrassing..

5-Sep-07 3:20

Welcome to the Human Race Smile | :)

______________________
Mr Griffin, eleventy billion is not a number... WTF | :WTF:

Muammar©

5-Sep-07 0:55

but how do you send two arguments to be put in one string array when the called function has one string array defined in its header..

private void SayHi(string[] str_In)
{
MessageBox.Show(<blink>str_In[0]</blink>+" "+<blink>str_In[1]</blink>);
}

...

SayHi(<blink>"Hi"</blink>,<blink>"Cpian!"</blink>); //of course this's wrong, but how to do it without having to create another string array, fill it and send it;

Smile: A curve that can set a lot of things straight!
(\ /)
(O.o)
(><)

Re: It's quite embarrassing..

Urs Enzler5-Sep-07 1:00