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Until the OP clarifies what his issue is, and its context, I think we are "reading tea leaves" here, but I must disagree with you, respectfully, regarding using a Form in the way you show here.
It's a waste of resources, imho, even if you go to the trouble of hiding all the form-adornments, control-box, maximize and minimize buttons, etc.
By the way in the code you show here, if the Form is the last control added to the Panel, the setting of its Dock property to 'Fill means it will fill the Panel and completely obscure any other controls added previously.
The idea that would one would want to "Clear" all the Controls in a Panel, is, to me, also a dubious one: typically you have built-up a set of Controls in a Container for a good reason, and you would want to re-use them, not discard them.
UserControls and Panels, and other "lighter weight" containers, make sense here, given the little we know of the OP's actual scenario.
best, Bill
"Is it a fact - or have I dreamt it - that, by means of electricity, the world of matter has become a great nerve, vibrating thousands of miles in a breathless point of time? Rather, the round globe is a vast head, a brain, instinct with intelligence!" - Nathanial Hawthorne, House of the Seven Gables
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BillWoodruff wrote: The idea that would one would want to "Clear" all the Controls in a Panel, is, to me, also a dubious one: typically you have built-up a set of Controls in a Container for a good reason, and you would want to re-use them, not discard them.
Clearing the controls-collection doesn't discard the controls, it merely clears the controls-collection of the container, and yes, I'm reusing that container to show something else that's already in memory.
BillWoodruff wrote: UserControls and Panels, and other "lighter weight" containers, make sense here, given the little we know of the OP's actual scenario.
The "cost" of a Form isn't that excessive.
Bastard Programmer from Hell 
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Eddy Vluggen wrote: Clearing the controls-collection doesn't discard the controls, it merely clears the controls-collection of the container, and yes, I'm reusing that container to show something else that's already in memory.
You interpret my use of the word 'discard' as if I had said 'Dispose' which is an incorrect interpretation. Of course the Controls, and even their internal "state" is not "lost," when they are removed from a ControlCollection, by 'Clear().'
What is "discarded" is the entire "design and intelligence" that (hopefully) went into creating a collection of Controls on a Panel (or Form, or UserControl). Which includes placement, z-order, tab-order, docking, anchoring, etc.
To "flush" the ControlCollection, just to present something else is just a ridiculously bad programming practice when there are such simpler alternatives.
Yes, you could write code to copy all the Controls in a Panel into an Array (using CopyTo(Control[], index)), and you could loop through that array, and, hopefully, restore the Panel's controls to a previous configuration: but what a waste of time and code ... when all you have to do is hide the whole Panel, or fill it, temporarily, with some other container that hides the 'original controls.'
And to design a ControlCollection to be used once and discarded: I can't imagine what kind of real-world scenario would call for such an implementation.
Forms are 'expensive,' and I think the way you have advocated using them here is an example of how to mis-use Forms.
Good programming practice uses "lighter-weight" objects for "lighter weight" tasks. The days of "MDI" are gone (praise be, except for the undoubted 'legacy' applications that will use that architecture until doomsday), and the use of Forms within Forms is just bad practice.
yrs, Bill
"Is it a fact - or have I dreamt it - that, by means of electricity, the world of matter has become a great nerve, vibrating thousands of miles in a breathless point of time? Rather, the round globe is a vast head, a brain, instinct with intelligence!" - Nathanial Hawthorne, House of the Seven Gables
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BillWoodruff wrote: What is "discarded" is the entire "design and intelligence" that (hopefully) went into creating a collection of Controls on a Panel (or Form, or UserControl). Which includes placement, z-order, tab-order, docking, anchoring, etc.
Not notably different from a UserControl, and somewhat easier to manage at times.
BillWoodruff wrote: Yes, you could write code to copy all the Controls in a Panel into an Array (using CopyTo(Control[], index)), and you could loop through that array, and, hopefully, restore the Panel's controls to a previous configuration: but what a waste of time and code ... when all you have to do is hide the whole Panel, or fill it, temporarily, with some other container that hides the 'original controls.'
I didn't mention copying controls. Merely instantiate the Form/UserControl and assign it to a container that's serving as a a placeholder.
BillWoodruff wrote: Forms are 'expensive,' and I think the way you have advocated using them here is an example of how to mis-use Forms.
They're more expensive than a Panel, but in turn they offer a bit more design-time flexibility. Yes, a BackGroundWorker is more expensive than a Thread, but the tradeoff can be worth it. That's why we don't code in C at this moment 
BillWoodruff wrote: and the use of Forms within Forms is just bad practice
Since when? Have you taken a look at the VS-IDE?
Bastard Programmer from Hell
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I have put together an appication that uses the WMP Cpmponent.
This works perfectly on my machine and other machines, and I can run it and play whatever files I wish under my account, guest account or any other account I care to create on my machine, I have also tested it on other machines without an issue.
The problem is, that the people who whish to use it are on a VERY secure network with privileges really locked dowm, and the player although working fine for the admin who installed it, is unable to find the codec needed when used by another user. It gets even wierder in that the standard Windows WMP will play the file without a problem, it CAN find the codec.
I am totally baffled and was wondering if anyone may have an idea of what the hell is going on.
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Look in the Event Viewer to see if anything is being logged there that may give you a clue.
Also, maybe your application needs to be added to the windows firewall exceptions.
If your actions inspire others to dream more, learn more, do more and become more, you are a leader." - John Quincy Adams
You must accept one of two basic premises: Either we are alone in the universe, or we are not alone in the universe. And either way, the implications are staggering” - Wernher von Braun
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Hi, I was just wondering...
To write a good, interactive online game (as an example) would normally require flash, and this has its own language...right?
Now, if I learnt C#, is it possible to have some kind of "flash" like interface so that I could place interactive programs online.
I was looking at Silverlight, would you be able to use this to write 100% C# games and then run them in the browser, or is there another method?
I am interested as I want to create my own little, fun, gaming website. But instead of presenting my games for download, I would like to allow the user to run them in the browser, online.
I really don't want to start learning flash and other tools and technology’s just yet, and would prefer to do this as close to 100% C# as possible, but would still like to include basic graphics, animations, sound etc.
Thank you for any ideas.
Steve
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Yep, Silverlight can do pretty much anything Flash can do (as far as multimedia and interaction go), and you can use C# for Silverlight. As long as the user has the Silverlight plugin installed, they will be able to run your games in their browser (just like a user would need the Flash plugin to run Flash games). Flash runs on more browsers than Silverlight, but most users at least have the option of downloading Silverlight and the number of computers Silverlight is installed on is huge.
Flash uses ActionScript, if you feel like learning that.
Mashoo offers Silverlight games, if you want to see what is possible.
Martin Fowler wrote: Any fool can write code that a computer can understand. Good programmers write code that humans can understand.
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AspDotNetDev wrote: Yep, Silverlight can do pretty much anything Flash can do
Excellent!
AspDotNetDev wrote: Flash uses ActionScript, if you feel like learning that.
Not really. I am still learning C#, and I have heard that the learning curve for proper use of ActionScript can be a bit high.
I am glad I can use C# with Silverlight, and I will look into this when I become a little better with C#
Thank you,
Steve
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One more thing. Keep in mind that you will probably also be heavily involed with XAML if you use Silverlight. XAML is basically what you use to build UI's in Silverlight. Everything you can do in XAML you can also do in pure C#, but most documentation and such shows the XAML.
Martin Fowler wrote: Any fool can write code that a computer can understand. Good programmers write code that humans can understand.
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AspDotNetDev wrote: One more thing. Keep in mind that you will probably also be heavily involed with XAML if you use Silverlight. XAML is basically what you use to build UI's in Silverlight. Everything you can do in XAML you can also do in pure C#, but most documentation and such shows the XAML.
OK, Thank you for the "heads up", I will take a look into it. Proberbly just end up getting myself a book on WPF and Silverlight.
Kind Regards,
Stephen
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There are also lots of great articles here on CodeProject which will help you to learn XAML/C#. Most are WPF oriented, but since Silverlight is a subset of WPF they are still very useful, especially any by Josh Smith[^] and Sacha Barber[^], amongst others.
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OK thank you again,
I have pleanty to get going with.
Thank you,
Steve
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You may wish to evaluate MS's XNA[^] platform for gaming. Uses C# (and now VB, as well).
And, check out ASPDotNetDev's comments here:[^], as well as[^].
I have no experience with XNA, have no idea what it's current and future status is, but other folks here on CP do !
best, Bill
"Is it a fact - or have I dreamt it - that, by means of electricity, the world of matter has become a great nerve, vibrating thousands of miles in a breathless point of time? Rather, the round globe is a vast head, a brain, instinct with intelligence!" - Nathanial Hawthorne, House of the Seven Gables
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Thank you,
I will have a look at XNA aswell,
Steve
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You need more details in your idea.
Angry Birds is not in any way comparable to World of Warcraft. And neither is comparable to Portal.
Not conceptually and not in implementation.
And your question is, vaguely, about display options only.
stephen.darling wrote: would prefer to do this as close to 100% C# as possible
So in terms of this and your mention of "online game".
Then your strategy would be.
1. Design the game.
2. Create a C# game that runs on your computer. GUI and internals are all in C#. (Nothing online about it and ONLY one person.)
3. Create an installer for the game (2).
4. For the online part create your own down load server and allow the installer (3) to be downloaded from it.
Now if you want to create a game where several people play against or with each other then the strategy is different.
A. Design the game.
B. Create the game server. This handles communication between players.
C. Create the client app. This must include a way to find or designate the game server. There are different ways to implement this.
D. Create a down load server (not the same as 2) which allows a user to get the client app.
There are details that can modify the above strategies in different ways. For example you don't need to actually create a down load server. There are hosting companies and sites that will provide that for you.
Another variation is in C above where it could be entirely browser based. That eliminates step D but has its own limitations. (Although making it browser based is probably a good learning exercise and for a single person sufficient.)
1. Create
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Thank you for the advice, however, the game will be simple and aimed at one player. It must run in the browser as I must retain full controll of the source code.
The game itself will be very basic, with basic graphics and minimal animation.
I am currently persuing the idea of hosting a c# app in silverlight.
Thank you,
Steve
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Does anyone know of a class library, have example code or an algorithm to determine the optimal number of shipping containers required to transport x stock items? Stock items or varying sizes can be packed into the same shipping container.
We'll have the dimensions of the various stock items and the shipping containers, and would like to feed this and the item quantities being shipped into a routine.
Regards,
Andrew
Andy
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yes, knapsacks are described here[^].
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Unfortunately that article and the related packing problem article [^] are written in a language only mathematicians understand. 
Andy
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Capital sigma is summation. And, now that you know the name of the problem, you can google for it.
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I have to present a value (as string) into many formats
i.e :
Possibility to converts the data in differents units of measure
Exemple if I have Centimeter
L = 2019.80
and User chooses meter so the new L become
L = 20.19
Also depends on Precision :
if Precision = 2 I have L= 2019.80
and if Precision = 3 I have 2019.800 ...
So can you help me ?
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You need to look into the String.Format methods[^]. The link points to the MSDN page for this.
As for converting lengths i.e from centimetre to metre etc, you are going to have to have some sort of conversion class that does the actual conversion, and then calls String.Format on the result.
Hope this helps
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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I need to check whether password has at least 6 characters with at least 1 letter and one special character. I am checking the condition !Regex.IsMatch(strPassword,"(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{6,24})$"). But it doesnot allow special character.
I need to change the expression to check if there is at least one special character.
Please help me out.
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