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• Enigmail - how to encrypt only part of the message?

  - by Lukasz Zaroda

  When I confirmed my OpenPGP key on launchpad I got a mail from them, that was only partially encrypted with my key (only few paragraphs inside the message). Is it possible to encrypt only chosen part of the message with Enigmail? Or what would be the easiest way to accomplish it? Added #1: I found a pretty convenient way for producing ASCII armoured encrypted messages by using Nautilus interface (useful for ones that for some reason doesn't like to work with terminal). You need to install Nautilus-Actions Configuration Tool, and add there a script with a name eg. "Encrypt in ASCII" and parameters: path: gpg parameters: --batch -sear %x %f The trick is that now you can create file, with extension that would be name of your recipient, you can then fill it with your message, right click it in Nautilus, choose "Encrypt in ASCII", and you will have encrypted ascii file which content you can (probably) just copy to your message. But if anybody knows more convenient solution please share it. Added #1B: In the above case if you care more about security of your messages, It's worth to turning off invisible backup files that gedit creates every time, you create new document, or just remember to delete them.

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• general questions about link spam

  - by hen3ry

  Hello, A CMS-based site I manage is suffering from a small but ominously growing number of almost certainly bot-emplaced, invisible spam links placed in registered-user-only shoutboxes and user forums. "Link Spam", yes? Until recently, I've kept my eyes on narrow tech issues, and I'm having trouble understanding what's going on. I understand that we need to tighten up our registration procedures, but more generally... Do I understand correctly that our primary interest in combatting link spam on our site is that major search engines reduce or zero the search visibility of sites that contain link spam? Although we're non-commercial, we don't want to be at the bottom of the rankings, or eliminated altogether. Are the linked-to sites the direct beneficiaries of the spam links, or is there some kind of indirection? What is the likely relationship between the link-spammers and the owners of the (directly or indirectly) linked-to sites? Are the owners of the linked-to sites paying the link-spammers for higher visibility? Are the owners aware that this method is being used? It is my impression that major search engines are capable these days of detecting that given sites are being promoted by link spam, and that these sites may consequently be reduced in search rank or dropped altogether. Do these sanctions occur frequently? Is there any potential value in sending notifications to the owners of the linked-to sites that their visibility is at risk? TIA, hen3ry

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• Couldn't dual boot Vista and Centos 5.4

  - by jack sparrow

  Hi all, Today I have installed Centos 5.4 with dual boot with Vista. Everything was fine, but after testing Centos 5.4, when I tried to load Vista, it did not load. After selecting vista from grub menu, it shows the following message: rootnoverify (hd0, 1) chainloader +1 No bootmgr found I googled and try to fix the boot but failed, Then I restart my machine, boot with vista cd and in rescue option, restore my bootmgr by typing bootrec /fixmbr What happened after that, I can load at vista now, but no grub menu shows :P It seems the Centos went totally invisible. I am using dual booting Ubuntu 9.10 and vista in my laptop and its working fine and with no error from the beginning. But installed Centos for one of my project needs and I need it running asap. So I am feeling very helpless. Please help me anyone out there. I know there are many people knows how to fix it. Please help me.. Thanks in advance.

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• Question about mipmaps + anisotropic filtering

  - by Telanor

  I'm a bit confused here and maybe someone can explain this to me. I created a simple test texture for my terrain which is nothing more than a solid green color with a black grid overlayed on top of it. If I look at the terrain in the distance with mipmapping on and linear filtering, the grid lines become blurry fairly quickly and further back the grid is pretty much invisible. With these settings, I don't get any moire patterns at all. If I turn on anisotropic filtering, however, the higher the anisotropic level, the more the terrain looks like it did with without mipmapping. The lines are much crisper nearby but in the distance I start to see terrible moire patterns. My understanding was that mipmapping is supposed to get rid of moire patterns. I've always had anisotropic filtering on in every game I play and I've never noticed any moire patterns as a result, so I don't understand why it's happening in my game. I am using logarithmic depth however, could that be causing any problems? And if it is, how do I resolve it? I've created my sampler state like so (I'm using slimdx): ssa = SamplerState.FromDescription(Engine.Device, new SamplerDescription { AddressU = TextureAddressMode.Clamp, AddressV = TextureAddressMode.Clamp, AddressW = TextureAddressMode.Clamp, Filter = Filter.Anisotropic, MaximumAnisotropy = anisotropicLevel, MinimumLod = 0, MaximumLod = float.MaxValue });

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• make my Ubuntu 12.04 laptop visible on the network

  - by Andrew Boyd

  I'm ecstatically happy with my 12.04 on my laptop after loading it over my MS Vista... but there's just one thing, one little fly in the ointment.... While I can view our 2 Terabyte, shared hard-drive in the lounge (and copy files back and forth) I can't see my PC (when I boot up in Ubuntu 12.04) nor the Lubuntu computer connected to the TV (for movies, Youtube etc). Printing to the HP office jet on the PC doesnt work over the network either. Have had one dubious flirtation with Samba, which seems to be the only thing I've found that will 'work', however halfway through that "installation" everything just ground to a halt, the directions began to stop making sense... I was working from this page. Our Network consists of the following: Our Internet service is wirelessly sent to us from our provider to our dish on a pole. It comes into the house via an ethernet cable. We split it there to a phone, and to 6 other destinations (bedrooms, computers, and to another splitter in the lounge which has a wifi antennae and 4 ethernet ports). one port goes to the Lubuntu OS PC which is connected to the TV the second port goes to the 2 Terabyte harddrive (MS powered 'Mybooklive') (the other two are empty) My Ubuntu 12.04 laptop connects wirelessly to this splitter in the lounge. I know just enough about computers to get myself into an awful mess without too much trouble We usually can view friends' laptops when they get on our network (as they are invariably MS OS's) Our flatmate, who introduced us to Linux's computer is also invisible How can we make our Linux OS based computers visible on the network and share files and printing?

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• Thread safe GUI programming

  - by James

  I have been programming Java with swing for a couple of years now, and always accepted that GUI interactions had to happen on the Event Dispatch Thread. I recently started to use GTK+ for C applications and was unsurprised to find that GUI interactions had to be called on gtk_main. Similarly, I looked at SWT to see in what ways it was different to Swing and to see if it was worth using, and again found the UI thread idea, and I am sure that these 3 are not the only toolkits to use this model. I was wondering if there is a reason for this design i.e. what is the reason for keeping UI modifications isolated to a single thread. I can see why some modifications may cause issues (like modifying a list while it is being drawn), but I do not see why these concerns pass on to the user of the API. Is there a limit imposed by an operating system? Is there a good reason these concerns are not 'hidden' (i.e. some form of synchronization that is invisible to the user)? Is there any (even purely conceptual) way of creating a thread safe graphics library, or is such a thing actually impossible? I found this http://blogs.operationaldynamics.com/andrew/software/gnome-desktop/gtk-thread-awareness which seems to describe GTK differently to how I understood it (although my understanding was the same as many people's) How does this differ to other toolkits? Is it possible to implement this in Swing (as the EDT model does not actually prevent access from other threads, it just often leads to Exceptions)

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• Mutating Programming Language?

  - by MattiasK

  For fun I was thinking about how one could build a programming language that differs from OOP and came up with this concept. I don't have a strong foundation in computer science so it might be common place without me knowing it (more likely it's just a stupid idea :) I apologize in advance for this somewhat rambling question :) Anyways here goes: In normal OOP methods and classes are variant only upon parameters, meaning if two different classes/methods call the same method they get the same output. My, perhaps crazy idea, is that the calling method and class could be an "invisible" part of it's signature and the response could vary depending on who call's an method. Say that we have a Window object with a Break() method, now anyone (who has access) could call this method on Window with the same result. Now say that we have two different objects, Hammer and SledgeHammer. If Break need to produce different results based on these we'd pass them as parameters Break(IBluntObject bluntObject) With a mutating programming language (mpl) the operating objects on the method would be visible to the Break Method without begin explicitly defined and it could adopt itself based on them). So if SledgeHammer calls Window.Break() it would generate vastly different results than if Hammer did so. If OOP classes are black boxes then MPL are black boxes that knows who's (trying) to push it's buttons and can adapt accordingly. You could also have different permission sets on methods depending who's calling them rather than having absolute permissions like public and private. Does this have any advantage over OOP? Or perhaps I should say, would it add anything to it since you should be able to simply add this aspect to methods (just give access to a CallingMethod and CallingClass variable in context) I'm not sure, might be to hard to wrap one's head around, it would be kinda interesting to have classes that adopted themselves to who uses them though. Still it's an interesting concept, what do you think, is it viable?

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• Prevent Windows 7 prompt format USB HDD

  - by mike

  I am running Windows 7. I have a USB HDD 100% formatted with a Trucypt partition. When I insert the drive into my system, Windows asks if I would like to format the drive, each time I insert the drive. So how do I turn this prompt off? If so, I would prefer it be applied globally (e.g. no more prompts for any other drives). Since its an invisible partition unless mounted with Trucypt, Windows is always going to think nothing is there and continue to prompt me. I don't want to hit enter on the keyboard a few times by mistake doing something else and have it to go through the process. I'll lose everything. It is all backed up BTW. Will just be inconvienient.

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• Generate or update a PDF to include an encrypted, hidden watermark?

  - by Dave Jarvis

  Background Using LaTeX to write a book. When a user purchases the book, the PDF will be generated automatically. Problem The PDF should have a watermark that includes the person's name and contact information. Question What software meets the following criteria: Applies encrypted, invisible watermarks to a PDF Open Source Platform independent (Linux, Windows) Fast (marks a 200 page PDF in under 1 second) Batch processing (exclusively command-line driven) Collusion-attack resistant Non-fragile (e.g., PDF - EPS - PDF still contains the watermark) Well documented (shows example usages) Ideas & Resources Some thoughts and findings: Natural language processing (NLP) watermarks. Apply steganography on a randomly selected image. http://openstego.sourceforge.net/cmdline.html The problem with NLP is that grammatical errors can be introduced. The problem with steganography is that the images are sourced from an image cache, and so recreating that cache with watermarked images will impart a delay when generating the PDF (I could just delete one image from the cache, but that's not an elegant solution). Thank you!

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• Should I make the Cells in a Tiledmap as null when my player hits it

  - by Vishal Kumar

  I am making a Tile Based game using Libgdx. I took the idea from SuperKoalio platformer demo by Mario Zencher. When I wanted to implement Collectables in my game , I simply draw the coins using Tiled Map Editor. When my player hits that, I use to set that cell as null. Someday on this site suggested me not to do so... never use null. I agreed. What can be any other way. If I am using layer.setCell(x,y) to set the cell to any other cell... even if an transparent one .. my player seems to be stopped by an invisible object/hurdle. This is my code: for (Rectangle tile : tiles) { if (koalaRect.overlaps(tile)) { TiledMapTileLayer layer = (TiledMapTileLayer) map.getLayers().get(1); try{ type = layer.getCell((int) tile.x, (int) tile.y).getTile().getProperties().get("tileType").toString(); } catch(Exception e){ System.out.print("Exception in Tiles Property"+e); type="nonbreakable"; } //Let us destroy this cell if(("award".equals(type))){ layer.setCell((int) tile.x, (int) tile.y, null); listener.coin(); score+=100; test = ""+layer.getCell(0, 0).getTile().getProperties().get("tileType"); } //DOING THIS GIVES A BAD EFFECT if(("killer".equals(type))){ //player.health--; //layer.setCell((int) tile.x, (int) tile.y, layer.getCell(20,0)); } // we actually reset the player y-position here // so it is just below/above the tile we collided with // this removes bouncing :) if (player.velocity.y > 0) { player.position.y = (tile.y - Player.height); } Is this a right approach? OR I should create separate Sprite Class called Coin.

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• How to create an extensible rope in Box2D?

  - by Thomas

  Let's say I'm trying to create a ninja lowering himself down a rope, or pulling himself back up, all whilst he might be swinging from side to side or hit by objects. Basically like http://ninja.frozenfractal.com/ but with Box2D instead of hacky JavaScript. Ideally I would like to use a rope joint in Box2D that allows me to change the length after construction. The standard Box2D RopeJoint doesn't offer that functionality. I've considered a PulleyJoint, connecting the other end of the "pulley" to an invisible kinematic body that I can control to change the length, but PulleyJoint is more like a rod than a rope: it constrains maximum length, but unlike RopeJoint it constrains the minimum as well. Re-creating a RopeJoint every frame using a new length is rather inefficient, and I'm not even sure it would work properly in the simulation. I could create a "chain" of bodies connected by RotationJoints but that is also less efficient, and less robust. I also wouldn't be able to change the length arbitrarily, but only by adding and removing a whole number of links, and it's not obvious how I would connect the remainder without violating existing joints. This sounds like something that should be straightforward to do. Am I overlooking something?

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• Daemons die with bus error when their binaries live on NFS

  - by mbac32768

  We have some daemons executing on a number of hosts. The daemon executable images are these very large binaries that are hosted on NFS. When the binaries are updated on the NFS server, the previously running daemons sometimes drop dead with a Bus error. I'm assuming what's happening is the NFS server is replacing the binaries in a way that's invisible to the VFS layer on the NFS clients so they end up loading pages from the updated binary, which of course leads to madness. We tried moving the new binaries into place instead of cp, but that doesn't seem to fix it. I'm considering simply mlock()'ing the binary in the daemon startup script, but surely there's magic NFS options or semantics that we should be abusing. Is there a better way to fix this?

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• Collision detection, stop gravity

  - by Scott Beeson

  I just started using Gamemaker Studio and so far it seems fairly intuitive. However, I set a room to "Room is Physics World" and set gravity to 10. I then enabled physics on my player object and created a block object to match a platform on my background sprite. I set up a Collision Detection event for the player and the block objects that sets the gravity to 0 (and even sets the vspeed to 0). I also put a notification in the collision event and I don't get that either. I have my key down and key up events working well, moving the player left and right and changing the sprites appropriately, so I think I understand the event system. I must just be missing something simple with the physics. I've tried making both and neither of the objects "solid". Pretty frustrating since it looks so easy. The player starting point is directly above the block object in the grid and the player does fall through the block. I even made the block sprite solid red so I could see it (initially it was invisible, obviously).

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• Need alternative to Accessibility's "Locate Pointer" to visually highlight the mouse.

  - by fred.bear

  Update: See end of quetion: A black-on-white cross-hair/I-bar mouse-pointer is soemtimes hard foe me to spot in amongst black-on-white text. I've tried "Accessibility / Mouse Accessibility / Locate Pointer" .. which will: Show pointer position when Control is presssed It works (to a point), but it does have a notable problem, which renders it inpractical. It has the uncanny side-effect of disallowing all Control key navigation while editing a file/dir name in Nautilus (F2).. Just touching the Control key drops it out of edit mode, which means I can't keyboard paste, move-L/R word etc... So, I'm looking for an alternative. I've tried Compiz's Water Effect, but I need something which is sharper, faster, and localized to the pointer. Compiz's Show Mouse (with fire) is no suitable. I'm really lookingf for an analog of "Accessibility / Locate Pointer": * ie. I hit Control (only).. and it blips a quick visual pulse. UPDATE: I've just realized why I can't find my mouse so often! ... It's because it is isn't there !!! ... Two apps I use a lot, Gedit and Konsole (KDE Terminal; it renders unicode better), ... dissolve the mouse-pointer to invisible after the first key is typed ... and Konsole does it after a few seconds of idle-time... like a video-player option: "hide the mouse".. Well I don't use the mouse much, and I thought it was juse my eyesight (which does rely a lot on Compiz's zoom)... I discovered it when I installed a "novelty" app, called Geyes from gnome-applets ("A goofy set of eyes for the GNOME panel. They follow your mouse.") ... It could follow the mouse better than me! :)

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• Customize side panel in Internet Explorer 9/Windows 7

  - by Kari

  I use Internet Explorer 9 with all the horizontal toolbars except the tab bar invisible to maximize vertical space. I have plenty of room at the side so I have the Favorites/Feeds/History panel open, usually on Favorites to replace the Favorites bar. I'd like to customize the shortcuts in this panel to display as large icons, similar to when you set the display in Windows Explorer to Large Icons and, long shot... change the backround color. The side panel does appear to be just a Windows Explorer window but it seems immune to any kind of tampering or customization, mainly because right clicking is disabled on the empty space. Changing browsers is not going to happen but can someone help out here?

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• OpenSSH SFTP server with chroot() + File Permissions

  - by HannesFostie

  I am currently setting up an SFTP server but there is one detail I can't seem to figure out. When I add a user, I would like him to connect using his client and be able to write in his "root dir" right away. My Match case for the SFTP-users group currently has ChrootDirectory set as "/home/%u", and inside that directory I have to have a subdirectory owned by the user, while /home/%u itself is owned by root. Next to that, the "root dir" also has a couple files, .bashrc to name one. Is it possible to put these files somewhere else, remove them, or at least make them invisible to the user? Thanks EDIT: One more little thing I'd like to implement is for one account to have read (or rw, not sure yet) access to all other users' home directories. What is the easiest way to implement this?

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• How to hide the mouse cursor

  - by MvG

  I'm building a kiosk using Ubuntu Precise on a touch screen. Now I'm looking for the appropriate way to make the mouse cursor disappear. As people know where they are pointing, displaying an arrow under their finger is useless, and having an error where they last pointed even more so. My best bet would be some kind of cursor theme consisting only of transparent cursors. I'm a bit surprised to find no UI to switch and maybe install cursor themes the default Unity UI, but as I won't be using Unity, that's not much of a problem. It appears that the alternatives listed in update-alternatives --list x-cursor-theme all refer to .theme files, so I searched the package list for those. The resulting list does not list any likely candidates, i.e. no packages containing “invisible” or “transparent” in their name. So far, some googled result yielding a readme for “XCursor Transparent Theme” is my best bet. That would mean compiling those sources myself, perhaps putting them into my PPA. I'm also a bit sceptical about that result as said readme is dated from 2003. And I'm not sure that I'm not making things overly complicated. After all, there is quite some support in Precise for touch devices, so I don't believe I'm the first one who wants to get rid of his mouse cursor. Is there another way which doesn't involve user-compiled binary code? Is there a theme package for transparent cursors which I've overlooked? Is there some other mechanism to make the cursor disappear without changing the cursor theme? I'll be using Matchbox WM, Firefox and Java applets, so I'll be happy with any solution working under such a setup. I'm not interested in any solutions twiddling with Gnome or Compiz, as I'll not be running either.

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• Windows 7 and Ubuntu Boot/Corruption Problems

  - by Kiraisuki

  I searched around, but I couldn't find the answer to why Windows 7 Ultimate 64x and Ubuntu 12.04 LTS 64x could'nt live together happily on my Asus G1s-X1 laptop. I had Windows 7 Ultimate 64x installed on the laptop when I bought it (bought it used, it comes with Vista new) and I wanted to try out Ubuntu and see what all the hype about the free OS was. I installed Ubuntu on an external 80GB iomega HDD with Windows 7 on my main drive. They both work fine for about 2-3 weeks, until Ubuntu suddenly is unable to boot. A few days after Ubuntu fails, Windows corrupts majorly (winload.exe, ntkrnlpa.exe, and various others corrupt randomly) and Windows Recovery Environment is completely useless. Booting to a live USB with Ubuntu and trying to reinstall it fails, and trying to wipe the main drive and install it there fails as well (something about my graphics card.) I managed to get Windows 7 Ultimate 64x back up and running (after many disk formats) but now I am left with a broken (and invisible) Ubuntu installation on the external drive. Is there any way to get the broken and non-bootable Ubuntu installation off the HDD without damaging or erasing the many files and programs installed and stored on the 80GB drive?

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• How do you convince the client their application's backend needs a rewrite?

  - by Richard DesLonde

  I have been supporting a LOB winforms application for a client the last 3 years. The application is built with a simple monolithic architecture and uses .NET 2.0. The application is a core part of their operations and its longevity is paramount. It needs to evolve with their evolving business processes, as well as implement improved functionality etc....this brings me to believe that this application needs an overhaul of sorts on the back-end. The problem is changing a back-end is "invisible"...i.e. the user never actually sees it. It's a quality of the system that is changing (stability, maintainability, reliability, longevity), not some functional requirement that will be easily seen...i.e. the ROI is not obvious. There is a lot of new functionality to be added to the front-end as well (user experience). I am considering a strategy of changing the back-end over time...i.e. when making a change or adding a feature to the front-end, change those components in the back-end that are affected, eventually you get to everything. How do I convince the client that we need to rebuild the back-end?

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• SQL Server Configuration Manager menu won't show up

  - by Aurelien Gasser

  I'm running a Windows 8 VM on a MacBook using Parallels Desktop 9. On this Windows VM, I have a SQL Server instance running perfectly. However, when I launch SQL Server Configuration Manager, and I want to enable an IP configuration, the Enable menu options are invisible : Here is a screenshot : http://i.imgur.com/PY7qGup.png (I don't have enough reputation to display the image inline) When I click the arrow, a contextual menu should appear with 2 choices "Yes" or "No". Instead, a tiny contextual menu appears, but it's empty. I tried using my keyboard tab/space/arrows keys without success. Has anyone faced/solved the same problem ?

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• Massive Xubuntu desktop malfunction

  - by viktiglemma

  I'm using Xubuntu 11.04. Before everything worked fine, but when booting today the following happened: 1) Window focus does not leave the first-opened program. This means that if I keep Firefox open, and open a terminal, window focus will never be transferred to the terminal. (EDIT: if I open a terminal first, and then open Firefox, Firefox steals focus) 2) Window menus have disappeared. The maximize, minimize, etc., buttons and menu are gone. 3) In Xfce Settings Manager, the "Window Manager" settings window is empty. There is just a gray screen there, so I cannot modify any window settings. 4) The keyboard shortcuts I had previously defined using the Settings Manager do no longer work. Further, ALT-TAB no longer works for cycling between windows. 5) The mouse pointer does not show when I first log in. I have to log out and log in again (with an invisible pointer) before the mouse shows itself. EDIT: 6) I cannot resize or move the Thunderbird window, but I can move the Firefox window What can I do to troubleshoot this?

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• Removing spam external links after pharma hack?

  - by Beatchef

  Back in February my work's site was attacked by a pharma hack at the shared hosting end. I managed to find the placed file and the reference to run it in one of our files. I deleted this file, deleted and redownloaded all of the plugins and themes and reinstalled Wordpress. However I could never find the database entries no matter what I have read up on. Searching for known entries or for drug names backwards etc. On the Google and Bing end I have managed to deny and delete the entries and cache of most if not all of the bad links that the hack managed to instantly SEO to death (why don't these guys work legit and make more money?) However the one thing that is remaining is external links on the homepage that are invisible except when the site is viewed in google cache or scanned with unmaskparasites.com (and says that the external links are safe even though they're obviously not!). http://www.UnmaskParasites.com/security-report/?page=kmcharityteam.co.uk All sorts of website scans say there's nothing wrong with it and I can't find the source of the links in the header or footer or anywhere in the theme. I've searched for the links in the database but no use there either and they change every day so really I'd have to be looking for a generator? Does anybody have any advice or a solution for removing these links? Thanks!

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• Debian, CentOS, Slackware, FreeBSD, OpenSolaris and Ubuntu Server Edition: Which one to use for an http web server?

  - by Ako

  I am going to install and administrate a virtual server for a small university. The server should run inside a virtual machine (VirtualBox OSE). It is only used in the university network and is invisible to the outside world. It should run Apache web server for PHP, MySQL and probably a mail server. I don't know which OS to use. Main criteria for choosing include ease of administration and updating, package management and performance. I wonder if anyone has any suggestions? And candidate OSs are: Debian, Ubuntu, CentOS, Slackware, FreeBSD, OpenSolaris. Add any other OS if you know any better alternatives.

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• Would form keys reduce the amount of spam we receive?

  - by David Wilkins

  I work for a company that has an online store, and we constantly have to deal with a lot of spam product reviews, and bogus customer accounts. These are all created by automated systems and are more of a nuisance than anything. What I am thinking of (in lieu of captcha, which can be broken) is adding a sort of form key solution to all relevant forms. I know for certain some of the spammers are using XRumer, and I know they seldom request a page before sending us the form data (Is this the definition of CSRF?) so I would think that tying a key to each requested form would at least stem the tide. I also know the spammers are lazy and don't check their work, or they would see that we have never posted a spam review, and they have never gained any revenue from our site. Would this succeed in significantly reducing the volume of spam product reviews and customer account creations we are seeing? EDIT: To clarify what I mean by "Form Keys": I am referring to creating a unique identifier (or "key") that will be used as an invisible, static form field. This key will also be stored either in the database (relative to the user session) or in a cookie variable. When the form's target gets a request, the key must be validated for the form's data to be processed. Those pesky bots won't have the key because they don't load the javascript that generates the form (they just send a blind request to the target) and even if they did load the javascript once, they'd only have one valid key, and I'm not sure they even use cookies.

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• 15 Puzzle Shuffle Method Issues

  - by Codemiester

  I am making a 15 puzzle game in C# that allows the user to enter a custom row and column value up to a maximum of a 10 x 10 puzzle. Because of this I am having problems with the shuffle method. I want to make it so the puzzle is always solvable. By first creating a winning puzzle then shuffling the empty space. The problem is it is too inefficient to call every click event each time. I need a way to invoke the click event of a button adjacent to the empty space but not diagonal. I also use an invisible static button for the empty spot. The PuzzlePiece class inherits from Button. I am not too sure how to do this. I would appreciate any help. Thanks here is what I have: private void shuffleBoard() { //5 is just for test purposes for (int i = 0; i < 5; i++) { foreach (Control item in this.Controls) { if (item is PuzzlePiece) { ((PuzzlePiece)item).PerformClick(); } } } } void PuzzlePiece_Click(object sender, EventArgs e) { PuzzlePiece piece = (PuzzlePiece)sender; if (piece.Right == puzzleForm.emptyPiece.Left && piece.Top == puzzleForm.emptyPiece.Top) { movePiece(piece); } else if (piece.Left == puzzleForm.emptyPiece.Right && piece.Top == puzzleForm.emptyPiece.Top) { movePiece(piece); } else if (piece.Top == puzzleForm.emptyPiece.Bottom && piece.Left == puzzleForm.emptyPiece.Left) { movePiece(piece); } else if (piece.Bottom == puzzleForm.emptyPiece.Top && piece.Left == puzzleForm.emptyPiece.Left) { movePiece(piece); } }

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