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• Linking with Boost error

  - by drhorrible

  I just downloaded and ran the boost installer for version 1.42 (from boostpro.com), and set up my project according to the getting started guide. However, when I build the program, I get this linker error: LINK : fatal error LNK1104: cannot open file 'libboost_program_options-vc90-mt-gd-1_42.lib' The build log adds this (I've replaced project-specific paths with *'s): Creating temporary file "******\Debug\RSP00001252363252.rsp" with contents [ /OUT:"*********.exe" /INCREMENTAL /LIBPATH:"C:\Program Files\boost\boost_1_42_0\lib" /MANIFEST /MANIFESTFILE:"Debug\hw6.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /DEBUG /PDB:"********\Debug\***.pdb" /SUBSYSTEM:CONSOLE /DYNAMICBASE /NXCOMPAT /MACHINE:X86 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib ".\Debug\****.obj" ".\Debug\****.exe.embed.manifest.res" ] Creating command line "link.exe @********\Debug\RSP00001252363252.rsp /NOLOGO /ERRORREPORT:PROMPT" I've also emailed [email protected] (with a message very similar to this), but I thought maybe so would be faster.

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• Difference between Setting.settings and web.config?

  - by Muneeb

  This might sound a bit dumb. I always had this impression that web.config should store all settings which are suspect to change post-build and setting.settings should have the one which may change pre-build. but I have seen projects which had like connection string in setting.settings. Connection Strings should always been in web.config, shouldnt it? I am interested in a design perspective answer. Just a bit of background: My current scenario is that I am developing a web application with all the three tiers abstracted in three separate visual studio projects thus every tier has its own .settings and .config file.

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• Trapping Error Status in MSBuild

  - by Ruben Bartelink

  As part of some build automation of running xUnit.net tests with MSBuild, I'm running into a case where I need to loop over a batch of items. Inside the loop, I need to detect whether an iteration failed, but I want to continue executing regardless. Then after the batched bit, I need to know whether one or more errors have occurred in order to report the outcome to TeamBuild. IOW, in pseudocode: Task Name=RunTests CreateItems ForEach item CallTarget Target=RunTest ContinueOnError=true CombineNUnitResults Report success/failure Task Name=RunTest XUnit item I'm hoping this can be achieved without a custom task (or hacking the xunit.net MSBuild task as Jonne did). (But willing to use MSBuild Community or Sdc tasks) And @BradWilson: I this is isnt possible to do cleanly, I'll be looking for Jonne's change a la the NUnit task to also make it into the xunit task See also: http://stackoverflow.com/questions/517560/how-do-i-get-team-build-to-show-test-results-and-coverage-for-xunit-net-test-suit

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• Checking out systems programming, what should I learn, using what resources?

  - by Anto

  I have done some hobby application development, but now I'm interested in checking out systems programming (mainly operating systems, Linux kernel etc.). I know low-level languages like C, and I know minimal amounts of x86 Assembly (should I improve on it?). What resources/books/websites/projects etc. do you recommend for one to get started with systems programming and what topics are important? Note that I know close to nothing about the subject, so whatever resources you suggest should be introductory resources. I still know what the subject is and what it includes etc., but I have not done systems programming before (but some application development, as previously noted, and I'm familiar with a bunch of programming languages as well as software engineering in general and algorithms, data structures etc.).

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• Google I/O 2010 - SEO site advice from the experts

  Google I/O 2010 - SEO site advice from the experts Google I/O 2010 - SEO site advice from the experts Tech Talks Matt Cutts, Greg Grothaus, Evan Roseman A perfect opportunity to get your website reviewed by the experts in the Google Search Quality team. Attendees can get concrete search engine optimization (SEO) feedback on their own sites. We'll also answer real-life questions that affect developers when it comes to optimizing their websites for search. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 308 12 ratings Time: 01:00:38 More in Science & Technology

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• error A2070: invalid instruction operands IN SSE MASM64

  - by Green

  when compiling this in ml64.exe 64bit (masm64) the SSE command give me an error what do i need to do to include the SSE commands in 64 bit? .code test PROC movlps [rdx], xmm7 ;;error A2070: invalid instruction operands ;//Inc in vec ptr add rsi, 16 movhlps xmm6, xmm7 movss [rdx+8], xmm6 ;;rror A2070: invalid instruction operands ret test ENDP end i get the error: 1>Performing Custom Build Step 1> Assembling: extasm.asm 1>extasm.asm(6) : error A2070: invalid instruction operands 1>extasm.asm(10) : error A2070: invalid instruction operands 1>Microsoft (R) Macro Assembler (x64) Version 8.00.50727.215 1>Copyright (C) Microsoft Corporation. All rights reserved. 1>Project : error PRJ0019: A tool returned an error code from "Performing Custom Build Step"

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• Guidance for a C# developer to become better UI developer

  - by Pankaj Upadhyay

  I am a C# developer and had developed simple websites in regular asp.net(with asp.net controls) and a wpf application. Nowadays, I am trying myself in Asp.net MVC3 and been exposed to the HTML with Razor view Engine. To be honest, I am not too good or I should awful at my knowledge of HTML and CSS. Therefore, I keep posting questions now and then on SO for very simple tasks. This has made me very tired of the this Q&A development process. So, now i am thinking of learning the basics of HTML, CSS and maybe some Javascript. Therefore i would request you to guide me to become an efficient enough developer for these technologies. Something that won't take much time and get me up and running fast.

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• SSL cert install in Mongrel

  - by normalocity

  Running a RoR app. I've created a self-signed SSL cert for my test/dev environment, which consists of a single mongrel, and Mac OS X Leopard. Can I install the SSL cert in such a way that mongrel will use it, or do I have build a different server stack to handle SSL (e.g. Apache in front of a mongrel cluster), and install the cert inside of Apache? For my production server, I'll eventually build a server stack like this, so it's no big deal if I have to go that direction - it's just a question of now or later. Thanks!

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• What should web programmers know about cryptography?

  - by davidhaskins

  Should programmers who build websites/web applications understand cryptography? I have no idea how most crypographic algorithms work, and I really don't understand the differences between md5/des/aes/etc. Have any of you found any need for an in-depth understanding of cryptography? I haven't needed it, but I wonder if perhaps I'm missing something. I've used salt + md5 hash to encrypt passwords, and I tell webservers to use SSL. Beyond that, I can't say I've used much else, nor can I say with any certainty how secure these methods are. I only use them because other people claim they are safe. Have you ever found a need to use cryptography in web programming aside from these two simple examples?

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• How do I install MATLAB R2012a?

  - by Mehdi

  I have downloaded MATLAB R2012a for Unix platform and i want to install it on my ubuntu 11.10. To install i try this command: /<matlab_installation_file_directory>/install and it says: install: missing file operand According to it's manual i must give it an input file, So i create an input file like this to install in 'Stand Alone' mode: destinationFolder=usr/local/R2012a fileInstallationKey=xxxxx-xxxxx-xxxxx-xxxxx-xxxxx agreeToLicense=yes outputFile=/tmp/mathworks_usr.log mode=interactive activationPropertiesFile=home/.../lic_standalone.dat Acctually i'm not sure in "activationPropertiesFile" field what file is required, so i supposed it requires license file. I saved this file as txt format in the same directory which installation files are. Then i tried this command: install -inputFile my_input_file.txt and it gets this error: install: invalid option -- 'i' I know there is some helps in other websites and also some questions here about this topic, but i can't figure out what's the problem, Please help me, i'm a real noob on linux . Thank you guys

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• qemu-kvm virtual machine virtio network freeze under load

  - by Rick Koshi

  I'm having a problem with my virtual machines, where the network will freeze under heavy load. I'm using CentOS 6.2 as both host and guest, not using libvirt, just running qemu-kvm directly as follows: /usr/libexec/qemu-kvm \ -drive file=/data2/vm/rb-dev2-www1-vm.img,index=0,media=disk,cache=none,if=virtio \ -boot order=c \ -m 2G \ -smp cores=1,threads=2 \ -vga std \ -name rb-dev2-www1-vm \ -vnc :84,password \ -net nic,vlan=0,macaddr=52:54:20:00:00:54,model=virtio \ -net tap,vlan=0,ifname=tap84,script=/etc/qemu-ifup \ -monitor unix:/var/run/vm/rb-dev2-www1-vm.mon,server,nowait \ -rtc base=utc \ -device piix3-usb-uhci \ -device usb-tablet /etc/qemu-ifup (used by the above command) is a very simple script, containing the following: #!/bin/sh sudo /sbin/ifconfig $1 0.0.0.0 promisc up sudo /usr/sbin/brctl addif br0 $1 sleep 2 And here's the info on br0 and other interfaces: avl-host3 14# brctl show bridge name bridge id STP enabled interfaces br0 8000.180373f5521a no bond0 tap84 virbr0 8000.525400858961 yes virbr0-nic avl-host3 15# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: em1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff 3: em2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP qlen 1000 link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff 4: em3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 18:03:73:f5:52:1e brd ff:ff:ff:ff:ff:ff 5: em4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000 link/ether 18:03:73:f5:52:20 brd ff:ff:ff:ff:ff:ff 6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff inet6 fe80::1a03:73ff:fef5:521a/64 scope link valid_lft forever preferred_lft forever 7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 18:03:73:f5:52:1a brd ff:ff:ff:ff:ff:ff inet 172.16.1.46/24 brd 172.16.1.255 scope global br0 inet6 fe80::1a03:73ff:fef5:521a/64 scope link valid_lft forever preferred_lft forever 8: virbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 52:54:00:85:89:61 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 9: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 500 link/ether 52:54:00:85:89:61 brd ff:ff:ff:ff:ff:ff 12: tap84: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500 link/ether ba:e8:9b:2a:ff:48 brd ff:ff:ff:ff:ff:ff inet6 fe80::b8e8:9bff:fe2a:ff48/64 scope link valid_lft forever preferred_lft forever bond0 is a bond of em1 and em2. virbr0 and virbr0-nic are vestigial interfaces left over from CentOS's default installation. They are unused (as far as I know). The guest runs perfectly until I run a large 'rsync', when the network will freeze after some seemingly-random time (usually under a minute). When it freezes, there is no network activity in or out of the guest. I can still connect to the guest's console via vnc, but it is unable to speak out its network interface. Any attempt to 'ping' from the guest gives a "Destination Host Unreachable" error for 3/4 packets and no reply for every fourth packet. Sometimes (perhaps two thirds of the time), I can bring the interface back to life by doing a "service network restart" from the guest's console. If this works (and if I do it before the rsync times out), the rsync will resume. Usually it will freeze again within a minute or two. If I repeat, the rsync will eventually finish, and I presume the machine goes back to waiting for another period of heavy load. Throughout the whole process, there are no console errors or relevant (that I can see) syslog messages on either guest or host machine. If the "service network restart" doesn't work the first time, trying again (and again and again) never seems to work. The command completes normally, with normal output, but the interface stays frozen. However, a soft reboot of the guest machine (without restarting qemu-kvm) always seems to bring it back. I am aware of the "lowest mac address" assignment problem, where the bridge takes on the mac address of the slave interface with the lowest mac address. This causes temporary network freezes, but is definitely not what's happening for me. My freezes are permanent until manual intervention, and you can see from the 'ip addr show' output above that the mac address being used by br0 is that of the physical ethernet. There are no other virtual machines running on the host. I've verified that each virtual machine on the subnet has its own unique mac address. I have rebuilt the guest machine several times, and I have tried this on three different host machines (identical hardware, built identically). Oddly, I do have one virtual host (the second of this series) which never seemed to have a problem. It never had its network freeze when it was running the same rsync during its build. It's particularly odd because it was the second build. The first, on a different host, did have the freezing problem, but the second did not. I assumed at the time that I had done something wrong with the first build, and that the problem was resolved. Unfortunately, the problem reappeared when I built the third VM. Also unfortunately, I can't do many tests with the working VM, as it's now in production use, and I'm hoping I can find the cause of this issue before that machine starts having problems. It's possible that I just got really lucky while running the rsync on the working machine, and that one time it didn't freeze. Of course it's possible that I somehow changed the build scripts without realizing it and re-broke something, but I can't find any such thing. In any case, I'm hoping someone has some idea what could cause this. Addendum: Preliminary tests suggest that I don't have the problem if I substitute e1000 for virtio in the first -net flag to qemu-kvm. I don't consider this a solution, but it is suitable for a stopgap. Has anyone else had (or better yet, solved) this problem with the virtio network driver?

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• How can I turn the structure of an XML file into a folder structure using ANT

  - by 1ndivisible

  I would like to be able to pass an XML file to an ANT build script and have it create a folder structure mimicking the nodal structure of the XML, using the build files parent directory as the root. For Example using: <root> <folder1> <folder1-1/> </folder1> <folder2/> <folder3> <folder3-1/> </folder3> </root> ant would create: folder1 -folder1-1 folder2 folder3 -folder3-1 I know how to create a directory, but i'm not sure how to have ANT parse the XML.

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• An Object reference is required for the non-static field

  - by Muhammad Akhtar

  I have make my existing method to static method to get access in javascript, like.. [WebMethod(EnableSession = true), ScriptMethod()] public static void Build(String ID) { Control releaseControl = LoadControl("~/Controls/MyControl.ascx"); //An Object reference is required for the non-static field, mthod or property // 'System.Web.UI.TemplateControl.LoadControl(string)' plc.Controls.Add(releaseControl); // where plc is place holder control //object reference is required for the nonstatic field, method, or property '_Default.pl' } When I build I am getting error and I have posted these in comments below each line before converted it to static method, it working perfectly. Please suggest me the solution of my issue. Thanks

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• Using .net 3.5 assemblies in asp.net 2.0 web application

  - by masterik

  I have an .net assembly build against 3.5 framework. This assembly has a class Foo with two method overrides: public class Foo { public T Set<T>(T value); public T Set<T>(Func<T> getValueFunc); } I'm referencing this assembly in my asp.net 2.0 web application to use first override of the Set method (without Func). But on build I get an error saying that I should reference System.Core to use System.Func delegate... but I'm not using this type... Is there a workaround to solve this? PS: There is no option to convert my web application targeting 3.5 framework.

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• Is GoDaddy telling the truth? [closed]

  - by Omne

  Everyone who is familiar with GoDaddy or even web business should know about the recent news about GoDaddy. There are just so many different news around the web that I can't process them in my head... http://articles.cnn.com/2012-09-10/tech/tech_web_go-daddy-outage_1_godaddy-outage-websites http://bits.blogs.nytimes.com/2012/09/10/member-of-anonymous-takes-credit-for-godaddy-attack/ And OFC GoDaddy says there were no hacker and costumer data is safe! I have used GoDaddy for long time and I'm not going to change my provider just for this problem, but I'm worry about my information... how can we make sure that GoDaddy is telling the truth? is our information really safe? I have not received any security alert from them telling me to change my password, should I assume that I'm safe?!

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• How do I create an Access 2003 MDE programmatically or by command line in Access 2007?

  - by Ned Ryerson

  I have a legacy Access 2003 database file that must remain in that format to preserve its menus and toolbars. I have recently moved to Access 2007 in my build environment and will be deploying the compiled Access 2003 program with the Access 2007 runtime. In Access 2003, I could script the process of creating an MDE with the Access Developer Extensions (WZADE.mde) using the command line and an .xml file of build preferences (without creating an install package). The Access 2007 developer extensions do not seem to offer a similar option. I can "Package a Solution", but it creates an accdr and buries it in a CD installer. I've tried programmatic options like Docmd.RunCommand acMakeMDEFILe and Syscmd(603, mdbpath, mdepath) but they no longer work in Access 2007. Of course, i can manually create an MDE using Database ToolsCreate MDE, but that is no scriptable as far as I can tell.

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• Ninject Contextual Binding: Where do I get Ninject.Conditions.dll

  - by Twisted

  I've read about ninjects contextual binding here : http://ninject.codeplex.com/wikipage?title=Contextual%20Binding and am trying to get it working in my project. The docs state that I need to add a reference to Ninject.Conditions.Dll which I do not have. Does anybody know where to get this? I've tried over at github : https://github.com/ninject/ninject I used the download link to get the 2.0.1.0 sources and managed to build them but no dll. I found a similar question here : Where can I find ninject.web.mvc.dll? and an answer with a link to a build server. I followed the link and I get a login request for team city. I don't have an account.

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• SSAS/SSRS remove parameter from cube report destroys report

  - by Jon

  Group, We built a data cube using SSAS and are now building SSRS reports off of that cube. Not sure if anyone has come across this, but when you build the report using the wizard and include parameters all looks fine. However if you are in the report after the wizard is compete, and you decide you want to remove one of the parameters you created it debunks the report and the only way to get it back is to re-create the whole report. Any way you can remove or add parameters after the initial build without destroying your report? Thanks in advance for the help! I love this forumn!

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• Add a Customizable, Free Application Launcher to your Windows Desktop

  - by Lori Kaufman

  RocketDock is an application launcher for Windows modeled after the Mac OS X launch toolbar. It’s a dock that sits along an edge of your screen and contains a collection of shortcuts that expand when you hover over them and launch programs when clicked. You can easily add shortcuts to programs, files, documents, folders, and even actions to the dock. The look of the dock is customizable using themes and icons. Docklets are available to help extend the functionality of your dock. We’ll show you how to install RocketDock, change the dock settings, add shortcuts to the dock, change the settings for shortcut icons, and add new themes to your dock. We’ll also show you how to install and setup a docklet, using the Stacks docklet as an example. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• Implementing google dashboard type interface in asp.net

  - by Sam_Cogan

  I'm looking at implementing a Google IG type dashboard in a .net app. There are a number of options I've found to do this, and i'm trying to establish what is going to be the best to use, in terms of speed, versatility etc. So far the options I am looking at are either to use asp.net webparts and .net Ajax, this would make it quicker to build, but I'm concerned this is going to make the application bulky and slow, or using JQuery, and either .net MVC or Webforms, to custom build an interface. Does anyone have any thoughts on what the best option may be, or any options I may have missed? All I want to do here is to allow users to customise a dashboard with a number of components (which will be user controls). I do also have access to Telerik controls, but I'm not sure if they would be any use here.

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• How do you include additional files using VS2010 web deployment packages?

  - by Jason

  I am testing out using the new web packaging functionality in visual studio 2010 and came across a situation where I use a pre-build event to copy required .dll's into my bin folder that my app relies on for API calls. They cannot be included as a reference since they are not COM dlls that can be used with interop. When I build my deployment package those files are excluded when I choose the option to only include the files required to run the app. Is there a way to configure the deployment settings to include these files? I have had no luck finding any good documentation on this.

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• How do you debug a unit test in Xcode 3?

  - by Dov

  I followed Apple's instructions to set up Unit Testing in my project. I followed the directions for making them dependent, so the tests run with every build of my main project. This works, and when my tests pass the application runs; when they don't, I get build errors on the lines of the unit tests that failed. I would like, however, to be able to step through my application code when the tests are failing, but can't get Xcode (3.2.5) configured properly. The project is a Mac project, not iOS. I tried the instructions here and here, but execution never stopped at the breakpoints I set, neither in the the unit test code or in my application code. After following the first set of instructions, the breakpoints I set turned yellow with blue outlines, and I don't know what that meant, either. What do I need to do to step through my tests?

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• Balanced Quad Tree

  - by Marcos Perez

  Hi, how can I build a balanced quad tree. Thanks, Marcos

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• Unity and Object Creation

  - by William

  I am using unity as my IoC container. I am trying to implement a type of IProviderRepository. The concrete implementation has a constructor that accepts a type of IRepository. When I remove the constructor parameter from the concrete implementation everything works fine. I am sure the container is wired correctly. When I try to create the concrete object with the constructor I receive the following error: "The current build operation (build key Build Key[EMRGen.Infrastructure.Data.IRepository1[EMRGen.Model.Provider.Provider], null]) failed: The current type, EMRGen.Infrastructure.Data.IRepository1[EMRGen.Model.Provider.Provider], is an interface and cannot be constructed. Are you missing a type mapping? (Strategy type BuildPlanStrategy, index 3)". Is it possible to achieve the above mention functionality with Unity? Namely have Unity infer a concrete type from the Interface and also inject the constructor of the concrete type with the appropriate concrete object based on constructor parameters. Below is sample of my types defined in Unity and a skeleton class listing for what I want to achieve. IProviderRepository is implemented by ProviderRepository which has a constructor that expects a type of IRepository. <typeAlias alias="ProviderRepositoryInterface" type="EMRGen.Model.Provider.IProviderRepository, EMRGen.Model" /> <typeAlias alias="ProviderRepositoryConcrete" type="EMRGen.Infrastructure.Repositories.Providers.ProviderRepository, EMRGen.Infrastructure.Repositories" /> <typeAlias alias="ProviderGenericRepositoryInterface" type="EMRGen.Infrastructure.Data.IRepository`1[[EMRGen.Model.Provider.IProvider, EMRGen.Model]], EMRGen.Infrastructure" /> <typeAlias alias="ProviderGenericRepositoryConcrete" type="EMRGen.Infrastructure.Repositories.EntityFramework.ApplicationRepository`1[[EMRGen.Model.Provider.Provider, EMRGen.Model]], EMRGen.Infrastructure.Repositories" /> <!-- Provider Mapping--> <typeAlias alias="ProviderInterface" type="EMRGen.Model.Provider.IProvider, EMRGen.Model" /> <typeAlias alias="ProviderConcrete" type="EMRGen.Model.Provider.Doctor, EMRGen.Model" /> //Illustrate the call being made inside my class public class PrescriptionService { PrescriptionService() { IUnityContainer uc = UnitySingleton.Instance.Container; UnityServiceLocator unityServiceLocator = new UnityServiceLocator(uc); ServiceLocator.SetLocatorProvider(() => unityServiceLocator); IProviderRepository pRepository = ServiceLocator.Current.GetInstance<IProviderRepository>(); } } public class GenericRepository<IProvider> : IRepository<IProvider> { } public class ProviderRepository : IProviderRepository { private IRepository<IProvider> _genericProviderRepository; //Explict public default constructor public ProviderRepository(IRepository<IProvider> genericProviderRepository) { _genericProviderRepository = genericProviderRepository; } }

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• Lambda Expression to be used in Select() query

  - by jameschinnock

  Hi, I am trying to build a lambda expression, containing two assignments (as shown further down), that I can then pass to a Queryable.Select() method. I am trying to pass a string variable into a method and then use that variable to build up the lambda expression so that I can use it in a LINQ Select query. My reasoning behind it is that I have a SQL Server datasource with many column names, I am creating a charting application that will allow the user to select, say by typing in the column name, the actual column of data they want to view in the y-axis of my chart, with the x-axis always being the DateTime. Therefore, they can essentially choose what data they chart against the DateTime value (it’s a data warehouse type app). I have, for example, a class to store the retrieved data in, and hence use as the chart source of: public class AnalysisChartSource { public DateTime Invoicedate { get; set; } public Decimal yValue { get; set; } } I have (purely experimentaly) built an expression tree for the Where clause using the String value and that works fine: public void GetData(String yAxis) { using (DataClasses1DataContext db = new DataClasses1DataContext()) { var data = this.FunctionOne().AsQueryable<AnalysisChartSource>(); //just to get some temp data in.... ParameterExpression pe = Expression.Parameter(typeof(AnalysisChartSource), "p"); Expression left = Expression.MakeMemberAccess(pe, typeof(AnalysisChartSource).GetProperty(yAxis)); Expression right = Expression.Constant((Decimal)16); Expression e2 = Expression.LessThan(left, right); Expression expNew = Expression.New(typeof(AnalysisChartSource)); LambdaExpression le = Expression.Lambda(left, pe); MethodCallExpression whereCall = Expression.Call( typeof(Queryable), "Where", new Type[] { data.ElementType }, data.Expression, Expression.Lambda<Func<AnalysisChartSource, bool>>(e2, new ParameterExpression[] { pe })); } } However……I have tried a similar approach for the Select statement, but just can’t get it to work as I need the Select() to populate both X and Y values of the AnalysisChartSource class, like this: .Select(c => new AnalysisChartSource { Invoicedate = c.Invoicedate, yValue = c.yValue}).AsEnumerable(); How on earth can I build such an expression tree….or….possibly more to the point…..is there an easier way that I have missed entirely?

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