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  • kernelHow to read/write files within kernel module?

    - by Methos
    I know all the discussions about why one should not read/write files from kernel, instead how to use /proc or netlink to do that. I want to read/write anyway. I have also read http://www.linuxjournal.com/article/8110 However, problem is 2.6.30 does not export sys_read(). Rather its wrapped in SYSCALL_DEFINE3. So if I use that in my module, I get following warnings: WARNING: "sys_read" [xxx.ko] undefined! WARNING: "sys_open" [xxx.ko] undefined! Obviously insmod cannot load the module because linking does not happen correctly. Questions: How to read/write within kernel after 2.6.22 (where sys_read()/sys_open() are not exported)? In general, how to use system calls wrapped in macro SYSCALL_DEFINEn() from within the kernel?

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  • LUA: A couple of pattern matching issues

    - by Josh
    I'm fairly new to lua programming, but I'm also a quick study. I've been working on a weather forecaster for a program that I use, and it's working well, for the most part. Here is what I have so far. (Pay no attention to the zs.stuff. That is program specific and has no bearing on the lua coding.) if not http then http = require("socket.http") end local locale = string.gsub(zs.params(1),"%s+","%%20") local page = http.request("http://www.wunderground.com/cgi-bin/findweather/getForecast?query=" .. locale .. "&wuSelect=WEATHER") local location = string.match(page,'title="([%w%s,]+) RSS"') --print("Gathering weather information for " .. location .. ".") --local windspeed = string.match(page,'<span class="nobr"><span class="b">([%d.]+)</span>&nbsp;mph</span>') --print(windspeed) local condition = string.match(page, '<td class="vaM taC"><img src="http://icons-ecast.wxug.com/i/c/a/[%w_]+.gif" width="42" height="42" alt="[%w%s]+" class="condIcon" />') --local image = string.match(page, '<img src="http://icons-ecast.wxug.com/i/c/a/(.+).gif" width="42" height="42" alt="[%w%s]+" class="condIcon" />') local temperature = string.match(page,'pwsvariable="tempf" english="&deg;F" metric="&deg;C" value="([%d.]+)">') local humidity = string.match(page,'pwsvariable="humidity" english="" metric="" value="(%d+)"') zs.say(location) --zs.say("image ./Images/" .. image .. ".gif") zs.say("<color limegreen>Condition:</color> <color white>" .. condition .. "</color>") zs.say("<color limegreen>Temperature: </color><color white>" .. temperature .. "F</color>") zs.say("<color limegreen>Humidity: </color><color white>" .. humidity .. "%</color>") My main issue is this: I changed the 'condition' and added the 'image' variables to what they are now. Even though the line it's supposed to be matching comes directly from the webpage, it fails to match at all. So I'm wondering what it is I'm missing that's preventing this code from working. If I take out the <td class="vaM taC">< img src="http://icons-ecast.wxug.com/i/c/a/[%w_]+.gif" it'll match condition flawlessly. (For whatever reason, I can't get the above line to display correctly, but there is no space between the `< and img) Can anyone point out what is wrong with it? Aside from the pattern matching, I assure you the line is verbatim from the webpage. Another question I had is the ability to match across line breaks. Is there any possible way to do this? The reason why I ask is because on that same page, a few of the things I need to match are broken up on separate lines, and since the actual pattern I'm wanting to match shows up in other places on the page, I need to be able to match across line breaks to get the exact pattern. I appreciate any help in this matter!

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  • Permission Problem While Installing Module With CPAN

    - by neversaint
    I tried to following module using CPAN, but the message I get is the "I have neither the -x permission ..." . How can I resolve that? cpan[3]> install List::MoreUtils is it OK to try to connect to the Internet? [yes] Fetching with LWP: http://www.perl.org/CPAN/authors/id/V/VP/VPARSEVAL/List-MoreUtils-0.22.tar.gz CPAN: Digest::SHA loaded ok (v5.48) Fetching with LWP: http://www.perl.org/CPAN/authors/id/V/VP/VPARSEVAL/CHECKSUMS Checksum for /home/ewijaya/.cpan/sources/authors/id/V/VP/VPARSEVAL/List-MoreUtils-0.22.tar.gz ok Scanning cache /home/neversaint/.cpan/build for sizes .....I have neither the -x permission nor the permission to change the permission; cannot estimate disk usage of '/home/neversaint/.cpan/build/Module-Build-0.3607-Kvb1Vq' .I have neither the -x permission nor the permission to change the permission; cannot estimate disk usage of '/home/neversaint/.cpan/build/ExtUtils-ParseXS-2.2205-zuX4x2' ^CCaught SIGINT, trying to continue

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  • Send instance method to module

    - by Matchu
    Given the following module, module Foo def bar :baz end end def send_to_foo(method) # ...? end send_to_foo(:bar) # => :baz What code should go in send_to_foo to make the last line work as expected? (send_to_foo is obviously not how I would implement this; it just makes clearer what I'm looking for.) I expected Foo.send(:bar) to work at first, but it makes sense that it doesn't. It would if the method were defined as def self.bar, but that's no fun.

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  • Importing a function/class from a Python module of the same name

    - by Brendan
    I have a Python package mymodule with a sub-package utils (i.e. a subdirectory which contains modules each with a function). The functions have the same name as the file/module in which they live. I would like to be able to access the functions as follows, from mymodule.utils import a_function Strangely however, sometimes I can import functions using the above notation, however other times I cannot. I have not been able to work out why though (recently, for example, I renamed a function and the file it was in and reflected this rename in the utils.__init__.py file but it no longer imported as a functions (rather as a module) in one of my scripts. The utils.__init__.py reads something like, __all__ = ['a_function', 'b_function' ...] from a_function import a_function from b_function import b_function ... mymodule.__init__.py has no reference to utils Ideas?

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  • Drupal 6 - Including a module form in a view

    - by espais
    I'm making use of the Favorites module, in order to allow my users to favorite nodes they like. Currently, I know that there is a block available for listing out the favorites, along with the 'Add to favorites' button at the top of this list. What I'd like to do is generate the form which includes the button, and include it within each node that I generate. I'd gotten it hacked up and quickly working by copying the generated form and placing it in my views-view--fields-.tpl.php template, however I believe that doing it this way goes against the thought behind Drupal, and probably introduces security issues with the form_id and form_token being hand-written. I've attempted to call the get_form function, and have passed it the form_id that I found in the generated form code, however I can't get Drupal to recognize it. From some Googling I've noticed that generating module forms programmatically may require a hook, but I haven't been able to find any good examples of this. What is the best way to go about creating this form?

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  • Drupal OAuth Service Module

    - by user470714
    I am trying to do some research into potentially setting up an existing Drupal site with user accounts/login page to also be an OAuth service provider, basically authenticating users to make calls with a web service. I am looking for a Drupal module which will give this functionality. Most of what I run into are OAuth consumer modules, which is not what I want in this case. I've found a few modules which I think might do this for me, but the module descriptions are generally pretty vague and don't have much of a user base which doesn't inspire much confidence. Has anyone else done this before? What are the best modules available for doing this?

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  • Writing Ruby Libraries - hiding methods from outside the module

    - by JP
    Hi all, I'm writing a Ruby library which has a module with a bunch of classes inside it. Many of these classes need to be usable and modifiable by calling scripts, but I don't want (some of) the initializers to be visible/callable: module MyLib class Control def initialize # They can use this end def do_stuff Helper.new('things') end end class Helper # Shouldn't be visible def initialize(what) @what = what end def shout @what end end end c = MyLib::Control.new h = c.do_stuff p h.shout # => "things" # ^ All of this is desired # v This is undesirable p MyLib::Helper.new('!') # => <MyLib::Helper @what='!'> If it's a simple thing, then I'd also appreciate the generated RDoc not even include the .new method for the Helper class either. Any ideas? Thanks for reading!

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  • File/module structure in Python

    - by keithjgrant
    So I'm just getting started with Python, and currently working my way through diveintopython.org. The code examples are nice, but the vast majority of them are little four-line snippets, and I want to see a little more of the big picture. As I understand it--and correct me if I'm wrong--each '.py' file becomes a "module", and a group of modules in a directory becomes a "package" (at least, it does if I create a __init__.py file in that directory). What is it if I don't have a __init__.py file? So what does each "module" file look like? Do I generally define only one class in the file? Does anything else go in that file besides the class definition and maybe a handful of import commands?

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  • Linq to SQL and concurrency with Rob Conery repository pattern

    - by David Hall
    I have implemented a DAL using Rob Conery's spin on the repository pattern (from the MVC Storefront project) where I map database objects to domain objects using Linq and use Linq to SQL to actually get the data. This is all working wonderfully giving me the full control over the shape of my domain objects that I want, but I have hit a problem with concurrency that I thought I'd ask about here. I have concurrency working but the solution feels like it might be wrong (just one of those gitchy feelings). The basic pattern is: private MyDataContext _datacontext private Table _tasks; public Repository(MyDataContext datacontext) { _dataContext = datacontext; } public void GetTasks() { _tasks = from t in _dataContext.Tasks; return from t in _tasks select new Domain.Task { Name = t.Name, Id = t.TaskId, Description = t.Description }; } public void SaveTask(Domain.Task task) { Task dbTask = null; // Logic for new tasks omitted... dbTask = (from t in _tasks where t.TaskId == task.Id select t).SingleOrDefault(); dbTask.Description = task.Description, dbTask.Name = task.Name, _dataContext.SubmitChanges(); } So with that implementation I've lost concurrency tracking because of the mapping to the domain task. I get it back by storing the private Table which is my datacontext list of tasks at the time of getting the original task. I then update the tasks from this stored Table and save what I've updated This is working - I get change conflict exceptions raised when there are concurrency violations, just as I want. However, it just screams to me that I've missed a trick. Is there a better way of doing this? I've looked at the .Attach method on the datacontext but that appears to require storing the original version in a similar way to what I'm already doing. I also know that I could avoid all this by doing away with the domain objects and letting the Linq to SQL generated objects all the way up my stack - but I dislike that just as much as I dislike the way I'm handling concurrency.

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  • preg_match , pattern, php

    - by Michael
    I'm trying to extract some specific pictures from html content . Currently I have the following array [1] = Array ( [0] = BuEZm5g!Wk~$(KGrHqQH-DgEvrb2CLuOBL-vbkHlKw~~_14.JPG#!BuEZm5g!Wk~$(KGrHqQH-DgEvrb2CLuOBL-vbkHlKw~~_12.JPG|1#http://i.ebayimg.com/08#!BuEZqMQBGk~$(KGrHqQH-DoEvrKYSoPiBL-vb)WgLw~~_14.JPG#!BuEZqMQBGk~$(KGrHqQH-DoEvrKYSoPiBL-vb)WgLw~~_12.JPG|2#http://i.ebayimg.com/13#!BuEZtkw!2k~$(KGrHqYH-EYEvsh4EjJSBL-vb-bLow~~_14.JPG#!BuEZtkw!2k~$(KGrHqYH-EYEvsh4EjJSBL-vb-bLow~~_12.JPG|3#http://i.ebayimg.com/03#!BuEZ)!wEGk~$(KGrHqYH-DwEvq8Z1JuQBL-vcMOoFQ~~_14.JPG#!BuEZ)!wEGk~$(KGrHqYH-DwEvq8Z1JuQBL-vcMOoFQ~~_12.JPG|4#http://i.ebayimg.com/09#!BuEZ1IQEGk~$(KGrHqEH-D0EvqwClvviBL-vcclJwg~~_14.JPG#!BuEZ1IQEGk~$(KGrHqEH-D0EvqwClvviBL-vcclJwg~~_12.JPG|5#http://i.ebayimg.com/17#!BuEZ4FQCWk~$(KGrHqUH-DMEvS+,FRj5BL-vco)Qgg~~_14.JPG#!BuEZ4FQCWk~$(KGrHqUH-DMEvS+,FRj5BL-vco)Qgg~~_12.JPG|6#http://i.ebayimg.com/17#!BuEZ7FQEWk~$(KGrHqYH-EYEvsh4EjJSBL-vc1v2Hg~~_14.JPG#!BuEZ7FQEWk~$(KGrHqYH-EYEvsh4EjJSBL-vc1v2Hg~~_12.JPG|7#http://i.ebayimg.com/12#!BuEZ-c!Bmk~$(KGrHqQH-CYEvr5z9)NVBL-vdC,)Mg~~_14.JPG#!BuEZ-c!Bmk~$(KGrHqQH-CYEvr5z9)NVBL-vdC,)Mg~~_12.JPG|8#http://i.ebayimg.com/20#!BuE,CNgCWk~$(KGrHqIH-CIEvqKBurmhBL-vdRBe3!~~_14.JPG#!BuE,CNgCWk~$(KGrHqIH-CIEvqKBurmhBL-vdRBe3!~~_12.JPG|9#http://i.ebayimg.com/24#!BuE,FN!EWk~$(KGrHqUH-C0EvsBdjbv0BL-vdeFkD!~~_14.JPG#!BuE,FN!EWk~$(KGrHqUH-C0EvsBdjbv0BL-vdeFkD!~~_12.JPG|10#http://i.ebayimg.com/16#!BuE,IOgBmk~$(KGrHqEH-EMEvpym7mSLBL-vdqI6nw~~_14.JPG#!BuE,IOgBmk~$(KGrHqEH-EMEvpym7mSLBL-vdqI6nw~~ ) I need to extract only the pictures that start with ! and ends in 12.JPG . An example of expected result is !BuEZm5g!Wk~$(KGrHqQH-DgEvrb2CLuOBL-vbkHlKw~~_12.JPG . I have a pattern but it doesn't work for some reasons that I don't know . It is $pattern = "/#\!(.*)_12.JPG/"; Thank you in advance for any help

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  • Database migration pattern for Java?

    - by Eno
    Im working on some database migration code in Java. Im also using a factory pattern so I can use different kinds of databases. And each kind of database im using implements a common interface. What I would like to do is have a migration check that is internal to the class and runs some database schema update code automatically. The actual update is pretty straight forward (I check schema version in a table and compare against a constant in my app to decide whether to migrate or not and between which versions of schema). To make this automatic I was thinking the test should live inside (or be called from) the constructor. OK, fair enough, that's simple enough. My problem is that I dont want the test to run every single time I instantiate a database object (it runs a query so having it run on every construction is not efficient). So maybe this should be a class static method? I guess my question is, what is a good design pattern for this type of problem? There ought to be a clean way to ensure the migration test runs only once OR is super-efficient.

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  • Need help make these classes use Visitor Pattern and generics

    - by Shervin
    Hi. I need help to generify and implement the visitor pattern. We are using tons of instanceof and it is a pain. I am sure it can be modified, but I am not sure how to do it. Basically we have an interface ProcessData public interface ProcessData { public setDelegate(Object delegate); public Object getDelegate(); //I am sure these delegate methods can use generics somehow } Now we have a class ProcessDataGeneric that implements ProcessData public class ProcessDataGeneric implements ProcessData { private Object delegate; public ProcessDataGeneric(Object delegate) { this.delegate = delegate; } } Now a new interface that retrieves the ProcessData interface ProcessDataWrapper { public ProcessData unwrap(); } Now a common abstract class that implements the wrapper so ProcessData can be retrieved @XmlSeeAlso( { ProcessDataMotorferdsel.class,ProcessDataTilskudd.class }) public abstract class ProcessDataCommon implements ProcessDataWrapper { protected ProcessData unwrapped; public ProcessData unwrap() { return unwrapped; } } Now the implementation public class ProcessDataMotorferdsel extends ProcessDataCommon { public ProcessDataMotorferdsel() { unwrapped = new ProcessDataGeneric(this); } } similarly public class ProcessDataTilskudd extends ProcessDataCommon { public ProcessDataTilskudd() { unwrapped = new ProcessDataGeneric(this); } } Now when I use these classes, I always need to do instanceof ProcessDataCommon pdc = null; if(processData.getDelegate() instanceof ProcessDataMotorferdsel) { pdc = (ProcessDataMotorferdsel) processData.getDelegate(); } else if(processData.getDelegate() instanceof ProcessDataTilskudd) { pdc = (ProcessDataTilskudd) processData.getDelegate(); } I know there is a better way to do this, but I have no idea how I can utilize Generics and the Visitor Pattern. Any help is GREATLY appreciated.

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  • JavaScript Module Pattern - What about using "return this"?

    - by Rob
    After doing some reading about the Module Pattern, I've seen a few ways of returning the properties which you want to be public. One of the most common ways is to declare your public properties and methods right inside of the "return" statement, apart from your private properties and methods. A similar way (the "Revealing" pattern) is to provide simply references to the properties and methods which you want to be public. Lastly, a third technique I saw was to create a new object inside your module function, to which you assign your new properties before returning said object. This was an interesting idea, but requires the creation of a new object. So I was thinking, why not just use "this.propertyName" to assign your public properties and methods, and finally use "return this" at the end? This way seems much simpler to me, as you can create private properties and methods with the usual "var" or "function" syntax, or use the "this.propertyName" syntax to declare your public methods. Here's the method I'm suggesting: (function() { var privateMethod = function () { alert('This is a private method.'); } this.publicMethod = function () { alert('This is a public method.'); } return this; })(); Are there any pros/cons to using the method above? What about the others?

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  • Scheme: Mysterious void in pattern match.

    - by Schemer
    Hi. I am writing a function called annotate that uses match-lambda -- often with recursive calls to annotate. Here is one of the pattern matches: (`(lambda (,<param1> . ,<params>) ,<stmts>) `(CLOSURE ENV (,<param1> . ,<params>) (lambda (ENV) ,(map annotate (map (lambda (x) (append `(,<param1> . ,<params>) (list x))) `(,<stmts>)))))) However, when this pattern is matched this is what returns: '(CLOSURE ENV (x) (lambda (ENV) ((CLOSURE ENV (x y) (lambda (ENV) ((+ x y)))))) #<void>) Specifically I can't figure out where "void" is coming from. In fact, if I include the line: ,(displayln (map annotate (map (lambda (x) (append `(,<param1> . ,<params>) (list x))) `(,<stmts>)))) it prints: ((CLOSURE ENV (x y) (lambda (ENV) ((+ x y))))) notably without "void". If someone could tell me what the problem is it would be greatly appreciated. Thanks.

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  • Repository Pattern Standardization of methods

    - by Nix
    All I am trying to find out the correct definition of the repository pattern. My original understanding was this (extremely dubmed down) Separate your Business Objects from your Data Objects Standardize access methods in data access layer. I have really seen 2 different implementations. Implementation 1 : public Interface IRepository<T>{ List<T> GetAll(); void Create(T p); void Update(T p); } public interface IProductRepository: IRepository<Product> { //Extension methods if needed List<Product> GetProductsByCustomerID(); } Implementation 2 : public interface IProductRepository { List<Product> GetAllProducts(); void CreateProduct(Product p); void UpdateProduct(Product p); List<Product> GetProductsByCustomerID(); } Notice the first is generic Get/Update/GetAll, etc, the second is more of what I would define "DAO" like. Both share an extraction from your data entities. Which I like, but i can do the same with a simple DAO. However the second piece standardize access operations I see value in, if you implement this enterprise wide people would easily know the set of access methods for your repository. Am I wrong to assume that the standardization of access to data is an integral piece of this pattern ? Rhino has a good article on implementation 1, and of course MS has a vague definition and an example of implementation 2 is here.

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  • NUnit Random Module

    - by Tra5is
    I've noticed something curious. When I attach the VS2010 debugger to the nunit.exe running process I see a loaded module with no path and a randomly generated filename. I tried attaching WinDBG to the exact same instance of NUnit.exe and the module is NOT listed in the module list. I also can't find anything with Google so I'm hoping someone here could help out. Is this normal NUnit behavior or is something sneaky going on? Some examples of the module name: 1xmsg0gj x4max0ed koh9hmef

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  • Converting a PowerShell Script into a Module Part 2

    In this article the author explains how PSModuleInfo object for a module can be retrieved. Further, he shows how code can be injected into the module to manipulate the state of a module without having to reload it. He also explains how to directly set some metadata elements, like the module description, and some other PSModuleInfo object features.

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  • Android NDK import-module / code reuse

    - by Graeme
    Morning! I've created a small NDK project which allows dynamic serialisation of objects between Java and C++ through JNI. The logic works like this: Bean - JavaCInterface.Java - JavaCInterface.cpp - JavaCInterface.java - Bean The problem is I want to use this functionality in other projects. I separated out the test code from the project and created a "Tester" project. The tester project sends a Java object through to C++ which then echo's it back to the Java layer. I thought linking would be pretty simple - ("Simple" in terms of NDK/JNI is usually a day of frustration) I added the JNIBridge project as a source project and including the following lines to Android.mk: NDK_MODULE_PATH=.../JNIBridge/jni/" JNIBridge/jni/JavaCInterface/Android.mk: ... include $(BUILD_STATIC_LIBRARY) JNITester/jni/Android.mk: ... include $(BUILD_SHARED_LIBRARY) $(call import-module, JavaCInterface) This all works fine. The C++ files which rely on headers from JavaCInterface module work fine. Also the Java classes can happily use interfaces from JNIBridge project. All the linking is happy. Unfortunately JavaCInterface.java which contains the native method calls cannot see the JNI method located in the static library. (Logically they are in the same project but both are imported into the project where you wish to use them through the above mechanism). My current solutions are are follows. I'm hoping someone can suggest something that will preserve the modular nature of what I'm trying to achieve: My current solution would be to include the JavaCInterface cpp files in the calling project like so: LOCAL_SRC_FILES := FunctionTable.cpp $(PATH_TO_SHARED_PROJECT)/JavaCInterface.cpp But I'd rather not do this as it would lead to me needing to update each depending project if I changed the JavaCInterface architecture. I could create a new set of JNI method signatures in each local project which then link to the imported modules. Again, this binds the implementations too tightly.

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  • Creating Entity Framework objects with Unity for Unit of Work/Repository pattern

    - by TobyEvans
    Hi there, I'm trying to implement the Unit of Work/Repository pattern, as described here: http://blogs.msdn.com/adonet/archive/2009/06/16/using-repository-and-unit-of-work-patterns-with-entity-framework-4-0.aspx This requires each Repository to accept an IUnitOfWork implementation, eg an EF datacontext extended with a partial class to add an IUnitOfWork interface. I'm actually using .net 3.5, not 4.0. My basic Data Access constructor looks like this: public DataAccessLayer(IUnitOfWork unitOfWork, IRealtimeRepository realTimeRepository) { this.unitOfWork = unitOfWork; this.realTimeRepository = realTimeRepository; } So far, so good. What I'm trying to do is add Dependency Injection using the Unity Framework. Getting the EF data context to be created with Unity was an adventure, as it had trouble resolving the constructor - what I did in the end was to create another constructor in my partial class with a new overloaded constructor, and marked that with [InjectionConstructor] [InjectionConstructor] public communergyEntities(string connectionString, string containerName) :this() { (I know I need to pass the connection string to the base object, that can wait until once I've got all the objects initialising correctly) So, using this technique, I can happily resolve my entity framework object as an IUnitOfWork instance thus: using (IUnityContainer container = new UnityContainer()) { container.RegisterType<IUnitOfWork, communergyEntities>(); container.Configure<InjectedMembers>() .ConfigureInjectionFor<communergyEntities>( new InjectionConstructor("a", "b")) DataAccessLayer target = container.Resolve<DataAccessLayer>(); Great. What I need to do now is create the reference to the repository object for the DataAccessLayer - the DAL only needs to know the interface, so I'm guessing that I need to instantiate it as part of the Unity Resolve statement, passing it the appropriate IUnitOfWork interface. In the past, I would have just passed the Repository constructor the db connection string, and it would have gone away, created a local Entity Framework object and used that just for the lifetime of the Repository method. This is different, in that I create an Entity Framework instance as an IUnitOfWork implementation during the Unity Resolve statement, and it's that instance I need to pass into the constructor of the Repository - is that possible, and if so, how? I'm wondering if I could make the Repository a property and mark it as a Dependency, but that still wouldn't solve the problem of how to create the Repository with the IUnitOfWork object that the DAL is being Resolved with I'm not sure if I've understood this pattern correctly, and will happily take advice on the best way to implement it - Entity Framework is staying, but Unity can be swapped out if not the best approach. If I've got the whole thing upside down, please tell me thanks

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  • ASP.NET MVC ViewModel Pattern

    - by Omu
    EDIT: I made something much better to fill and read data from a view using ViewModels, called it ValueInjecter. http://valueinjecter.codeplex.com/documentation using the ViewModel to store the mapping logic was not such a good idea because there was repetition and SRP violation, but now with the ValueInjecter I have clean ViewModels and dry mapping code I made a ViewModel pattern for editing stuff in asp.net mvc this pattern is usefull when you have to make a form for editing an entity and you have to put on the form some dropdowns for the user to choose some values public class OrganisationViewModel { //paramterless constructor required, cuz we are gonna get an OrganisationViewModel object from the form in the post save method public OrganisationViewModel() : this(new Organisation()) {} public OrganisationViewModel(Organisation o) { Organisation = o; Country = new SelectList(LookupFacade.Country.GetAll(), "ID", "Description", CountryKey); } //that's the Type for whom i create the viewmodel public Organisation Organisation { get; set; } #region DropDowns //for each dropdown i have a int? Key that stores the selected value public IEnumerable<SelectListItem> Country { get; set; } public int? CountryKey { get { if (Organisation.Country != null) { return Organisation.Country.ID; } return null; } set { if (value.HasValue) { Organisation.Country = LookupFacade.Country.Get(value.Value); } } } #endregion } and that's how i use it public ViewResult Edit(int id) { var model = new OrganisationViewModel(organisationRepository.Get(id)); return View(model); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult Edit(OrganisationViewModel model) { organisationRepository.SaveOrUpdate(model.Organisation); return RedirectToAction("Index"); } and the markup <p> <label for="Name"> Name:</label> <%= Html.Hidden("Organisation.ID", Model.Organisation.ID)%> <%= Html.TextBox("Organisation.Name", Model.Organisation.Name)%> <%= Html.ValidationMessage("Organisation.Name", "*")%> </p> <p> ... <label for="CountryKey"> Country:</label> <%= Html.DropDownList("CountryKey", Model.Country, "please select") %> <%= Html.ValidationMessage("CountryKey", "*") %> </p> so tell me what you think about it

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