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• how to bind the click event of a button and the selecteditemchanged of a listbox to a viewmodel in m

  - by Michel

  Hi, i'm just starting with the mvvm model in Silverlight. In step 1 i got a listbox bound to my viewmodel, but now i want to propagate a click in a button and a selecteditemchanged of the listbox back to the viewmodel. I guess i have to bind the click event of the button and the selecteditemchanged of the listbox to 2 methods in my viewmodel somehow? For the selecteditemchanged of the listbox i think there must also be a 'return call' possible when the viewmodel tries to set the selecteditem to another value? i come from a asp.net (mvc) background, but can't figure out how to do it in silverlight.

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• How do I shim a Excel automation addin that implements IDTExtensibility2 but is not a com add in?

  - by Shane

  I found this article http://blogs.officezealot.com/whitechapel/archive/2005/05/21/4728.aspx but the example given is a straight automation add-in that does not implement IDTExtensibility2. My add in implements IDTExtensibility2 to get access to the excel object model but is not installed as a COM add in so RegisterFunction for example will called when one of the add in functions is first used not when the excel starts as in the case of the a COM add in. Will this method described in the link above work in my case also? I tried version 2.3.1 of the shim wizard which seems to have support for automations add-ins (it has a check box for automation add ins in the metadata import process). The generated shim runs (I can see breakpoints being hit in the debugger), but my functions no longer work (i get #NAME). The shims is installed as a COM add in and loads when excel starts so I suspect it's not doing what I want.

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• Weird mapping error in linq-to-sql dbml file in VS2010

  - by rwwilden

  Since I switched to VS2010, several times a day I get a compilation error in my dbml file: DBML1005: Mapping between DbType 'bigint' and Type 'MyNamespace.SecurityToken' in Column 'SecurityToken' of Type 'Employee' is not supported When I restart VS2010 the error disappears. I have no problems running my application using this dbml file (specifically, there are no problems getting correct values inside the SecurityToken property of Employee objects). The SecurityToken property is of an enum type defined as follows: [Flags] public enum SecurityToken : long { None = 1, Admin = 2, ...... } The SecurityToken column in the database is of type bigint. Am I missing something? It's especially weird that the error only happens sometimes, when I'm writing code that isn't related at all to the LINQ model.

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• How do I use SimpleRepository without the migration approach?

  - by Bill Sempf

  I am evaluating SubSonic for use in Phase 2 of a large project. This is an ASP.NET project, with 700 tables in a SQL Server database. We are planning for our domain model to consist of POCO classes to assist with an offline access requirements we have. I believe that the SimpleRepository pattern would be among my best options. Since I have a database already, however, the migration assistance doesn't help me. Are there T4 templates for SimpleRepository that I just overlooked? How do I 'turn off' migration? If I missed something in the Wiki, point me there, otherwise get me started and I'll write up a Wiki entry for y'all when we get there.

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• How can I write a "user can only access own profile page" type of security check in Play Framework?

  - by karianneberg

  I have a Play framework application that has a model like this: A Company has one and only one User associated with it. I have URLs like http://www.example.com/companies/1234, http://www.example.com/companies/1234/departments, http://www.example.com/companies/1234/departments/employees and so on. The numbers are the company id's, not the user id's. I want that normal users (not admins) should only be able to access their own profile pages, not other people's profile pages. So a user associated with the company with id 1234 should not be able to access the URL http://www.example.com/companies/6789 I tried to accomplish this by overriding Secure.check() and comparing the request parameter "id" to the ID of the company associated with the logged in user. However, this obviously fails if the parameter is called anything else than "id". Does anyone know how this could be accomplished?

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• Validate form fields from InfoPath custom code

  - by Alex Angas

  I'm developing an InfoPath form for Forms Services. It has these views: View 1 asks the user to input some basic initial data View 2 calls a web service based on data in View 1 and populates drop-downs accordingly At the bottom of View 1 I've added a Next > button to move to View 2. As part of clicking that button I would like the inputs in View 1 to be validated first. However, there don't appear to be any rules that validate a view or anything in the object model to execute validation rules. Is there code that can trigger a field's validation event?

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• CreateChildControls AFTER Postback

  - by Francois

  I'm creating my own CompositeControl: a collection of MyLineWebControl and a "add" button. When the user press the "add" button, a new MyLineWebControl is added. In CreateChildControls(), I run through my model (some object MyGridOfLines which has a collection of MyLine) and add one MyLineWebControl for each MyLine. In addButton.Click, I add a new MyLine to my object MyGridOfLines. But, since the Click event method is called after CreateChildControls(), the new MyLineWebControl will be only displayed on the next postback. What can I do to "redraw" immediately my control, without loosing values that I've entered in each input?

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• Building a rails form to filter an index page?

  - by Schroedinger

  G'day guys, I'm having an issue with filtering the presentation of several thousand trade items I have in my system. As per the specs of the system we're building we have to have a form that allows people to put in a start date and then an interval in minutes, to filter the presentation of the items. I've built my helper functions to return all of the trades within that interval period, but I can't for the life of me properly build the form that will return a dateTime value and an integer value within the top of the index page? Any ideas? Would I have to build a separate model object to assign values to, or is there a simpler way?

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• How would I UPDATE these table entries with SQL and PHP?

  - by CT

  I am working on an Asset Database problem. I enter assets into a database. Every object is an asset and has variables within the asset table. An object is also a type of asset. In this example the type is server. Here is the Query to retrieve all necessary data: SELECT asset.id ,asset.company ,asset.location ,asset.purchaseDate ,asset.purchaseOrder ,asset.value ,asset.type ,asset.notes ,server.manufacturer ,server.model ,server.serialNumber ,server.esc ,server.warranty ,server.user ,server.prevUser ,server.cpu ,server.memory ,server.hardDrive FROM asset LEFT JOIN server ON server.id = asset.id WHERE asset.id = '$id' I then assign all results into single php variables. How would I write a query/script to update an asset?

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• ASP.Net Web Site Project - Errors Not Caught at Compile time

  - by 5arx

  For the first time in my career, I'm working on an ASP.Net (v3.5) project that has been set up as a Visual Studio 2008/10 Web Site Project. I'm not keen on this way of working this way for various reasons but for the moment and until such time as the company sees the virtue in working in an environment with namespaces, designer and project files etc., I have to continue with the existing codebase. I've run into some odd issues since I began this but perhaps the oddest one of all is that althought VS lets me build the code, it doesn't reliably pick up compilation errors so these are not noticed until runtime. I know the website model allows dynamic/hot compilation when a request is made for a specific but I can't see why it wouldn't do this when I manually (F5) build/rebuild the project. Its immensely annoying as you can imagine and I can't find a workaround. Could any StackOverflow person help with suome suggestions to make things better?

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• Entity Framework with File-Based Database

  - by Dave Swersky

  I am in the process of developing a desktop application that needs a database. The application is currently targeted to SQL Express 2005 and works wonderfully. However, I'm not crazy about having this dependency on SQL Express and would prefer to use a small file-based database. My problem is that I am using Entity Framework. I have tried both SQL Compact and SQLite, and they both have bizarre problems with EF v1. I get errors creating the Model, invalid models when it does get created... it's a nightmare. I'm about ready to give up and write a data layer and repository in the good-old-school Connection/Command pattern. Not my favorite plan... Is there a lightweight, file-based database out there that plays well with EF? OR Is there a better ORM tool that I should use instead of EF with my lightweight DB?

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• Grails GORM on multiple Forms

  - by Fabien Barbier

  Usually I'm using One-to-many relationship by this way : class Subject { static hasMany = [ crfs : Crf ] String name ... } class Crf { String title String info ... } I can extend this relationship to others domains, Ex : static hasMany = [ crfs : Crf, crfb : CrfBlood ...] But in my case I have to link the Subject domain to 30 others domains, maybe more...(ex : CrfBlood, CrfMedical, crfFamily, etc...). What domain model implementation should I use in my case ? I would like to keep the dynamic finders usability in my project.

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• Creating a QLineEdit search field for items displayed in a QListView

  - by krunk

  I want to create a search field that filters the items shown in a QListView. Basically the user could type in "foo" and only items with "foo" in the DisplayRole are shown. I already have a few ideas on how to do this, but thought I'd ask those more experienced than I. My idea would be to use some signals and slots to set a filter in the QAbstractItem model and trigger an update() in the QListView. Are there any helper methods in QListView for filtering I may have missed? Is there a canonical way of handling this I haven't run across?

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• LevelToVisibilityConverter in silverligt 4

  - by prince23

  <UserControl x:Class="SLGridImage.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"> <UserControl.Resources> <local:LevelToVisibilityConverter x:Key="LevelToVisibility" /> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White"> <sdk:DataGrid x:Name="dgMarks" CanUserResizeColumns="False" SelectionMode="Single" AutoGenerateColumns="False" VerticalAlignment="Top" ItemsSource="{Binding MarkCollection}" IsReadOnly="True" Margin="13,44,0,0" RowDetailsVisibilityMode="Collapsed" Height="391" HorizontalAlignment="Left" Width="965" VerticalScrollBarVisibility="Visible" > <sdk:DataGrid.Columns> <sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate> <Button x:Name="myButton" Click="myButton_Click"> <StackPanel Orientation="Horizontal"> <Image Margin="2, 2, 2, 2" x:Name="imgMarks" Stretch="Fill" Width="12" Height="12" Source="Images/test.png" VerticalAlignment="Center" HorizontalAlignment="Center" Visibility="{Binding Level, Converter={StaticResource LevelToVisibility}}" /> <TextBlock Text="{Binding Level}" TextWrapping="NoWrap" ></TextBlock> </StackPanel> </Button> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn Header="Name" > <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate > <Border> <TextBlock Text="{Binding Name}" /> </Border> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> <sdk:DataGridTemplateColumn Header="Marks" Width="80"> <sdk:DataGridTemplateColumn.CellTemplate> <DataTemplate> <Border> <TextBlock Text="{Binding Marks}" /> </Border> </DataTemplate> </sdk:DataGridTemplateColumn.CellTemplate> </sdk:DataGridTemplateColumn> </sdk:DataGrid.Columns> </sdk:DataGrid> </Grid> </UserControl> in .cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Collections.ObjectModel; using System.ComponentModel; namespace SLGridImage { public partial class MainPage : UserControl { private MarksViewModel model = new MarksViewModel(); public MainPage() { InitializeComponent(); this.DataContext = model; } private void myButton_Click(object sender, RoutedEventArgs e) { } } public class MarksViewModel : INotifyPropertyChanged { public MarksViewModel() { markCollection.Add(new Mark() { Name = "ABC", Marks = 23, Level = 0 }); markCollection.Add(new Mark() { Name = "XYZ", Marks = 67, Level = 1 }); markCollection.Add(new Mark() { Name = "YU", Marks = 56, Level = 0 }); markCollection.Add(new Mark() { Name = "AAA", Marks = 89, Level = 1 }); } private ObservableCollection<Mark> markCollection = new ObservableCollection<Mark>(); public ObservableCollection<Mark> MarkCollection { get { return this.markCollection; } set { this.markCollection = value; OnPropertyChanged("MarkCollection"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string propName) { if (PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(propName)); } } public class Mark { public string Name { get; set; } public int Marks { get; set; } public int Level { get; set; } } public class LevelToVisibilityConverter : System.Windows.Data.IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { Visibility isVisible = Visibility.Collapsed; if ((value == null)) return isVisible; int condition = (int)value; isVisible = condition == 1 ? Visibility.Visible : Visibility.Collapsed; return isVisible; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } #endregion } } when i run getting error The type 'local:LevelToVisibilityConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. what i am i missing here looking forward for an solution thank you

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• Can't set background colour for UIView from ViewController

  - by Curyous

  I have the following code in the view controller: - (void)viewDidLoad { [super viewDidLoad]; ThemeManager *themer = [ThemeManager sharedInstance]; UIView *theView = self.view; UIColor *forBackground = [themer backgroundColour]; [theView setBackgroundColor:forBackground]; } but when execution gets to the setBackgroundColor line, I get the following error: *** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40' There's got to be something simple that I'm doing wrong, how do I set the background colour? Do I have to subclass the view and do it in there? I'd prefer not to have the extra class, even though that is better separation of the whole model/view/controller thing. Update: value returned by [themer backgroundColour] is constructed using colorWithPatternImage:, could this make a difference?

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• Mathematica Plot3D does not produce a plot when graphing a user-defined function?

  - by pythonscript

  I'm writing a simple Mathematica implementation of the black-scholes model and using Plot3D to plot the pricing surface. However, when I run this code, no plot is produced. My call and put functions to produce correct values when run separately, but no plot is produced. Code: Clear[d1, d2, call, put, stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] d1[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := (Log[stockPrice / strikePrice] + (riskFreeRate + 0.5*volatility^2)*timeToExp) / (volatility * Sqrt[timeToExp]) d2[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] - volatility*Sqrt[timeToExp] call[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := stockPrice * CDF[NormalDistribution[0, 1], d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] - strikePrice * Exp[-riskFreeRate*timeToExp] *CDF[NormalDistribution[0, 1], d2[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] Plot3D[call[stockPrice, 500, 0.0030, timeToExp, 0.39], {stockPrice, 10, 1000}, {timetoExp, 0.0833333, 5}] Other plots, like this sample from the reference, do work. Plot3D[{x^2 + y^2, -x^2 - y^2}, {x, -2, 2}, {y, -2, 2}, RegionFunction -> Function[{x, y, z}, x^2 + y^2 <= 4], BoxRatios -> Automatic]

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• Route alias, is it possible?

  - by benoror

  I have a Vehicle model: map.resources :vehicles, :has_many => :suppliers Everything works great, but Vehicle has a boolean attribute is_truck. I want to make an Alias so I can get the same resources but with the "truck" word, I tried with: map.trucks '/trucks', :controller => :vehicles, :action => :index, :is_truck => true map.trucks '/trucks/by_supplier/:supplier', :controller => :vehicles, :action => :index, :is_truck => true The first one works well, but when I search within a Form the second doesn't work and searches all suppliers. Is it possible to map.resources for an alias ?

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• How do I verify the URL that ActiveResource intends to use on a call?

  - by btelles

  Hi there, I'm trying to request data from another Rails app, but I keep getting a "URL not found" error. Is it possible to use the debugger to figure out the intended URL and parameters for an intended ActiveResource call? For example, I'd like to make a GET request with the following parameters: https://some_server.com/employees/search.xml?last_name=smith And I have the following ActiveResource model class Employee < ActiveResource::Base self.site = "https://.some_server.com" end And the some_server.com app has a search action that maps this way: map.connect "/employees/search.:format", :controller => 'employees', :action => 'search' But when I try this: Employee.new(:last_name => 'smith).get(:search) I get a 404 "Service not found" error. To me, that sounds like the URL that ACtiveResource is requesting is incorrect, 'cause when I make the above request via a browser, I get the xml. Any idea what I'm doing wrong? Cheerio, Berns

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• How to move from untyped DataSets to POCO\LINQ2SQL in legacy application

  - by artvolk

  Good day! I've a legacy application where data access layer consists of classes where queries are done using SqlConnection/SqlCommand and results are passed to upper layers wrapped in untyped DataSets/DataTable. Now I'm working on integrating this application into newer one where written in ASP.NET MVC 2 where LINQ2SQL is used for data access. I don't want to rewrite fancy logic of generating complex queries that are passed to SqlConnection/SqlCommand in LINQ2SQL (and don't have permission to do this), but I'd like to have result of these queries as strong-typed objects collection instead of untyped DataSets/DataTable. The basic idea is to wrap old data access code in a nice-looking from ASP.NET MVC "Model". What is the fast\easy way of doing this?

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• C# Get Type of IEnumerable<TModel>

  - by Jimbo

  I have a method to which I pass an IEnumerable<TModel>. Then depending on the type of TModel, the method carries out a set of instructions as below: public void MyMethod<TModel>(IEnumerable<TModel> items) where TModel : class { int operationType; switch (typeof(TModel)) { case typeof(MyModelOne): operationType = 1; break; case typeof(MyModelTwo): operationType = 2; break; case typeof(MyModelThree): operationType = 3; break; default: throw new Exception("The collection model passed to MyMethod is not recognized"); } ... } This doesnt work, I get the error: There is no application variable or memeber 'TModel'

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• Processing file uploads before object is saved

  - by Dominic Rodger

  I've got a model like this: class Talk(BaseModel): title = models.CharField(max_length=200) mp3 = models.FileField(upload_to = u'talks/', max_length=200) seconds = models.IntegerField(blank = True, null = True) I want to validate before saving that the uploaded file is an MP3, like this: def is_mp3(path_to_file): from mutagen.mp3 import MP3 audio = MP3(path_to_file) return not audio.info.sketchy Once I'm sure I've got an MP3, I want to save the length of the talk in the seconds attribute, like this: audio = MP3(path_to_file) self.seconds = audio.info.length The problem is, before saving, the uploaded file doesn't have a path (see this ticket, closed as wontfix), so I can't process the MP3. I'd like to raise a nice validation error so that ModelForms can display a helpful error ("You idiot, you didn't upload an MP3" or something). Any idea how I can go about accessing the file before it's saved? p.s. If anyone knows a better way of validating files are MP3s I'm all ears - I also want to be able to mess around with ID3 data (set the artist, album, title and probably album art, so I need it to be processable by mutagen).

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• Best way to structure AJAX for a Zend Framework application

  - by John Nall

  Sorry, but there's a lot of outdated and just plain bad information for Zend Framework, since it has changed so much over the years and is so flexible. I thought of having an AJAX module service layer, with controllers and actions that interact with my model. Easy, but not very extensible and would violate DRY. If I change the logistics of some process I'll have to edit the AJAX controllers and the normal controllers. So ideally I would load the exact same actions for both javascript and non-javascript users. I have thought about maybe checking for $_POST['ajax'], if it is set I would load a different (json'y) view for the data. Was wondering how/a good way to do this (front controller plugin I imagine?) or if someone can point me to an UP TO DATE tutorial that describes a really good way for building a larger ajax application. thx

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• logic of button to be disabled or not in mvc

  - by rod

  Hi All, Here's an excerpt from a book I'm reading about application design with MVC: Ideally, the view is so simple and logic-free as to need virtually no testing. Users (and developers before users) can reasonably test the view by simply looking at the pixels on the screen. Anything else beyond pure graphical rendering should ideally be taken out of the view and placed in the controller and model. This includes, for example, the logic that determines whether a certain button should be enabled or grayed out at some point. what does the bold statement mean to you? what would this look like? thanks, rod.

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• Windows Server 2008 R2 network adapter stops working, requires hard reboot

  - by Geoff Dalgas

  TL;DR version: Turns out this was a Windows Server 2008 R2 kernel networking bug. After siccing Microsoft support on it, we (eventually) got an unpublished kernel hotfix from Microsoft to address it. If you, too, are experiencing mysterious low-level network driver failures requiring a reboot/bluescreen cycle, you might want that hotfix (or maybe Service Pack 1 whenever it is released, too.) We have been using HAProxy along with heartbeat from the Linux-HA project. We are using two linux instances to provide a failover. Each server has with their own public IP and a single IP which is shared between the two using a virtual interface (eth1:1) at IP: 69.59.196.211 The virtual interface (eth1:1) IP 69.59.196.211 is configured as the gateway for the windows servers behind them and we use ip_forwarding to route traffic. We are experiencing an occasional network outage on one of our windows servers behind our linux gateways. HAProxy will detect the server is offline which we can verify by remoting to the failed server and attempting to ping the gateway: Pinging 69.59.196.211 with 32 bytes of data: Reply from 69.59.196.220: Destination host unreachable. Running arp -a on this failed server shows that there is no entry for the gateway address (69.59.196.211): Interface: 69.59.196.220 --- 0xa Internet Address Physical Address Type 69.59.196.161 00-26-88-63-c7-80 dynamic 69.59.196.210 00-15-5d-0a-3e-0e dynamic 69.59.196.212 00-21-5e-4d-45-c9 dynamic 69.59.196.213 00-15-5d-00-b2-0d dynamic 69.59.196.215 00-21-5e-4d-61-1a dynamic 69.59.196.217 00-21-5e-4d-2c-e8 dynamic 69.59.196.219 00-21-5e-4d-38-e5 dynamic 69.59.196.221 00-15-5d-00-b2-0d dynamic 69.59.196.222 00-15-5d-0a-3e-09 dynamic 69.59.196.223 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.252 01-00-5e-00-00-fc static 225.0.0.1 01-00-5e-00-00-01 static On our linux gateway instances arp -a shows: peak-colo-196-220.peak.org (69.59.196.220) at <incomplete> on eth1 stackoverflow.com (69.59.196.212) at 00:21:5e:4d:45:c9 [ether] on eth1 peak-colo-196-215.peak.org (69.59.196.215) at 00:21:5e:4d:61:1a [ether] on eth1 peak-colo-196-219.peak.org (69.59.196.219) at 00:21:5e:4d:38:e5 [ether] on eth1 peak-colo-196-222.peak.org (69.59.196.222) at 00:15:5d:0a:3e:09 [ether] on eth1 peak-colo-196-209.peak.org (69.59.196.209) at 00:26:88:63:c7:80 [ether] on eth1 peak-colo-196-217.peak.org (69.59.196.217) at 00:21:5e:4d:2c:e8 [ether] on eth1 Why would arp occasionally set the entry for this failed server as <incomplete>? Should we be defining our arp entries statically? I've always left arp alone since it works 99% of the time, but in this one instance it appears to be failing. Are there any additional troubleshooting steps we can take help resolve this issue? THINGS WE HAVE TRIED I added a static arp entry for testing on one of the linux gateways which still didn't help. root@haproxy2:~# arp -a peak-colo-196-215.peak.org (69.59.196.215) at 00:21:5e:4d:61:1a [ether] on eth1 peak-colo-196-221.peak.org (69.59.196.221) at 00:15:5d:00:b2:0d [ether] on eth1 stackoverflow.com (69.59.196.212) at 00:21:5e:4d:45:c9 [ether] on eth1 peak-colo-196-219.peak.org (69.59.196.219) at 00:21:5e:4d:38:e5 [ether] on eth1 peak-colo-196-209.peak.org (69.59.196.209) at 00:26:88:63:c7:80 [ether] on eth1 peak-colo-196-217.peak.org (69.59.196.217) at 00:21:5e:4d:2c:e8 [ether] on eth1 peak-colo-196-220.peak.org (69.59.196.220) at 00:21:5e:4d:30:8d [ether] PERM on eth1 root@haproxy2:~# arp -i eth1 -s 69.59.196.220 00:21:5e:4d:30:8d root@haproxy2:~# ping 69.59.196.220 PING 69.59.196.220 (69.59.196.220) 56(84) bytes of data. --- 69.59.196.220 ping statistics --- 7 packets transmitted, 0 received, 100% packet loss, time 6006ms Rebooting the windows web server solves this issue temporarily with no other changes to the network but our experience shows this issue will come back. Swapping network cards and switches I noticed the link light on the port of the switch for the failed windows server was running at 100Mb instead of 1Gb on the failed interface. I moved the cable to several other open ports and the link indicated 100Mb for each port that I tried. I also swapped the cable with the same result. I tried changing the properties of the network card in windows and the server locked up and required a hard reset after clicking apply. This windows server has two physical network interfaces so I have swapped the cables and network settings on the two interfaces to see if the problem follows the interface. If the public interface goes down again we will know that it is not an issue with the network card. (We also tried another switch we have on hand, no change) Changing network hardware driver versions We've had the same problem with the latest Broadcom driver, as well as the built-in driver that ships in Windows Server 2008 R2. Replacing network cables As a last ditch effort we remembered another change that occurred was the replacement of all of the patch cords between our servers / switch. We had purchased two sets, one green of lengths 1ft - 3ft for the private interfaces and another set of red cables for the public interfaces. We swapped out all of the public interface patch cables with a different brand and ran our servers without issue for a full week ... aaaaaand then the problem recurred. Disable checksum offload, remove TProxy We also tried disabling TCP/IP checksum offload in the driver, no change. We're now pulling out TProxy and moving to a more traditional x-forwarded-for network arrangement without any fancy IP address rewriting. We'll see if that helps. Switch Virtualization providers On the off chance this was related to Hyper-V in some way (we do host Linux VMs on it), we switched to VMWare Server. No change. Switch host model We've reached the end of our troubleshooting rope and are now formally involving Microsoft support. They recommended changing the host model: http://en.wikipedia.org/wiki/Host_model http://technet.microsoft.com/en-us/magazine/2007.09.cableguy.aspx We did that, and.. we'll see.

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• ASP MVC 2 : Custom display of a required form element based on ModelMetaData

  - by Nigel

  I have an MVC 2 application that utilises forms. The required fields within the form are set using attributes that update the model metadata. The form fields are created using the MVC HtmlHelper method : Html.EditorFor. This works fine so far as validation is concerned, but it seems that by default the required fields are not displayed to the user (for example by appending a * to the control). If I wanted to provide some custom means of displaying this fact to the user (lets immagine I want to change the background colour of the edit control for example), where is the best place to do it. Would I need to create a custom html helper to replace EditorFor? I tried but it seemed difficult to gain access to the metadata for the correct property. I already have a custom ModelMetaDataProvider so there is no problem adding it there if that is the correct place.

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