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• Why use Monte-Carlo method?

  - by Gili

  When should the Monte-Carlo method be used? For example, why did Joel decide to use the Monte-Carlo method for Evidence Based Scheduling instead of methodically processing all user data for the past year?

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• C# Monte Carlo Simulation Package Needed

  - by Yunzhou

  I'm relative new to C# and doing a project using Monte Carlo Simulation. Basically my question is the following. I have two uncertain variable inputs, A and B, and they will go through a model and give an output C. So C = f(A,B). I know A's probability distribution (Triangular) and B's probability distribution (Discrete). How can I get the probability distribution of C? What I have done now is that I can generate random numbers based on A's triangular distribution as well as B's discrete distribution. Each pair of randomly generated A and B gives a resultant C. I've run this model 1000 times thus I can get 1000 possible values of C. The difficulty is to get the corresponding probabilities of each value of C. Obviously it's not 1/1000 unless C is uniformly distributed. Is there any Monte Carlo Simulation package/library I can use?

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• Arbitrary-precision random numbers in C: generation for Monte Carlo simulation without atmospheric n

  - by Yktula

  I know that there are other questions similar to this one, however the following question pertains to arbitrary-precision random number generation in C for use in Monte Carlo simulation. How can we generate good quality arbitrary-precision random numbers in C, when atmospheric noise isn't always available, without relying on disk i/o or network access that would create bottlenecks? libgmp is capable of generating random numbers, but, like other implementations of pseudo-random number generators, it requires a seed. As the manual mentions, "the system time is quite easy to guess, so if unpredictability is required then it should definitely not be the only source for the seed value." Is there a portable/ported library for generating random numbers, or seeds for random numbers? The libgmp also mentions that "On some systems there's a special device /dev/random which provides random data better suited for use as a seed." However, /dev/random and /dev/urandom can only be used on *nix systems.

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• Limit a program's execution time in C (Monte Carlo technique)

  - by rrs90

  I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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• C# Monte Carlo Incremental Risk Calculation optimisation, random numbers, parallel execution

  - by m3ntat

  My current task is to optimise a Monte Carlo Simulation that calculates Capital Adequacy figures by region for a set of Obligors. It is running about 10 x too slow for where it will need to be in production and number or daily runs required. Additionally the granularity of the result figures will need to be improved down to desk possibly book level at some stage, the code I've been given is basically a prototype which is used by business units in a semi production capacity. The application is currently single threaded so I'll need to make it multi-threaded, may look at System.Threading.ThreadPool or the Microsoft Parallel Extensions library but I'm constrained to .NET 2 on the server at this bank so I may have to consider this guy's port, http://www.codeproject.com/KB/cs/aforge_parallel.aspx. I am trying my best to get them to upgrade to .NET 3.5 SP1 but it's a major exercise in an organisation of this size and might not be possible in my contract time frames. I've profiled the application using the trial of dotTrace (http://www.jetbrains.com/profiler). What other good profilers exist? Free ones? A lot of the execution time is spent generating uniform random numbers and then translating this to a normally distributed random number. They are using a C# Mersenne twister implementation. I am not sure where they got it or if it's the best way to go about this (or best implementation) to generate the uniform random numbers. Then this is translated to a normally distributed version for use in the calculation (I haven't delved into the translation code yet). Also what is the experience using the following? http://quantlib.org http://www.qlnet.org (C# port of quantlib) or http://www.boost.org Any alternatives you know of? I'm a C# developer so would prefer C#, but a wrapper to C++ shouldn't be a problem, should it? Maybe even faster leveraging the C++ implementations. I am thinking some of these libraries will have the fastest method to directly generate normally distributed random numbers, without the translation step. Also they may have some other functions that will be helpful in the subsequent calculations. Also the computer this is on is a quad core Opteron 275, 8 GB memory but Windows Server 2003 Enterprise 32 bit. Should I advise them to upgrade to a 64 bit OS? Any links to articles supporting this decision would really be appreciated. Anyway, any advice and help you may have is really appreciated.

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• Facebook publishActivity: No error, but no activity published

  - by carlo.capocasa

  Hi, implementing publishActivity in PHP using the REST API using this code: $activity = array( 'message' => '{*actor*} did something.', 'action_link' => array( 'text' => 'Play Travians', 'href' => WEBROOT ) ); $activity = $facebook->api_client->dashboard_publishActivity($activity); I get a 15-digit number returned and no errors, however no activity appears in the logged in account or friends of this account. Help appreciated. Carlo

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• Invalid attempt to access a field before calling Read() INSERT

  - by Raphael Fernandes

  I'm trying to use this code to check if the system already exists a field with this value Dim adap As New MySqlDataAdapter Dim sqlquery = "SELECT * FROM client WHERE code ='"+ TxtCode.Text +"'" Dim comand As New MySqlCommand() comand.Connection = con comand.CommandText = sqlquery adap.SelectCommand = comand Dim data As MySqlDataReader data = comando2.ExecuteReader() leitor.Read() If (data(3).ToString) = code Then MsgBox("already exists", MsgBoxStyle.Information) TxtCode.ResetText() TxtCode.Focus() Else Console.WriteLine(insert("INSERT INTO client (name, tel, code) VALUES ('" & name & "', '" & tel & "')")) con.Close() End If

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• Visual C# 2008 Express deployment

  - by Carlo

  Hello, is there any way I can add some files in the deployment process so they get copied in the installation? I need an xml file that has some data that the application needs, I tried every option in the build action for the file but nothing works, the application always crashes after the installation. Also, I'd like the program to be installed under the Program Files directory. The folder where VS Express installs it it's weird some C:\Users\Carlo\Temp\Applications\weirdnumbers9231FFC231\ directory, and I don't want that either. Thanks in advance!

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• Remapping keyboard to get extra cursor keys - but why stick to VIM standard hjkl

  - by Carlo V. Dango

  Inspired from VIM I recently remapped my keyboard layout to get extra keys for cursor movement. Being fluent in both QWERTY and DVORAK, it came quite natural to me to remap the DF and JK keys rather than the VIM standard hjkl keys. Here is my reasoning It enables me to quickly identify cursor keys since F and J are physically marked on my keyboard I'm using two hands for movement rather than one. I guess from DVORAK I learned to appreciate shifting between hands rather than using primarily one hand. It maps well with the Kinesis keyboard mapping http://www.kinesis-ergo.com/advantage.htm that I use occasionally. I feel I'm using my strongest fingers. I don't have to stretch my right index finger to read H as I would using the VIM layout. However, since I am still doing green field explorations on the cursor key remapping, I'd like others to share their experiences and/or criticize my suggested mapping. PS. If you want to toy around with my remapping using Autohotkey here is my script ; extra cursor keys. !d:: Send {Left} <^>!d:: Send {Left} !f:: Send {Right} <^>!f:: Send {Right} !j:: Send {Up} <^>!j:: Send {Up} !k:: Send {Down} <^>!k:: Send {Down} The question Is this mapping sane or is the VIM mapping superior?

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• Internet key not always detected by the operating system

  - by Carlo Gisonni

  I've over the time, tried and installed several versions of Ubuntu. Those versions I like more than others are: Lubuntu and Kubuntu. Everything seems to work properly but the Internet key. I do not know if it may depends on the weather, the moonphase or the tides but the Internet key is not always detected by the system and is sometimes very difficult to establish a connection when I do need to connect to internet. Without applyng any change sometimes works sometimes not. I've so far not found the solution and I think is a quite strange behaviour of the operating system as if the settings are wrong, should never work Awaiting a kind answer from those of you willing to help.

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• Lubuntu 12.04 PPC slow startup and shutdown

  - by Carlo Bertuccini

  I've installed Lubuntu 12.04 on a Powerbook G4 (PowerPC 1GHz, 1 gb ram, Geforce MX 440). Everything works perfectly except the startup and shutdown. To startup my system I have to wait about 3 minutes (and similar time to shutdown) Giving a look @ /var/log/dmesg I noticed the following [drm] nouveau 0000:00:10.0: Detected an NV10 generation card (0x017900a5) checking generic (b8004000 151800) vs hw (b8000000 80000000) fb: conflicting fb hw usage nouveaufb vs 0Ffb NVDA,Displ - removing generic driver The only issue concerns Nouveau ... inside my /var/log/kern.log says what follows BUG: soft lockup - CPU#0 stuck for 22s! I've booted passing the "nouveau.modeset=0" parameter and the system boot in 15 seconds but with 4 bit graphics -- Any idea how to fix? Thanks in advance for any help

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• Merck Serono Gains Deep Understanding of Product Portfolio Value-Drivers, Risks, and Sales Expectations Through Forecasting Solution

  - by Melissa Centurio Lopes

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Merck Serono S.A. is the biopharmaceutical division of Merck KGaA. It offers leading brands in 150 countries to help patients with cancer, multiple sclerosis, infertility, endocrine and metabolic disorders, as well as cardiovascular diseases. Challenges: Establish a better decision-making framework for its complex, development portfolio of pharmaceutical products, where single-point estimates or expected averages of portfolio values, portfolio risks, and sales forecasts are insufficient and can be misleading Enable the company to be aware at all times of the range of possible outcomes of technical and market risks and uncertainties, such as the technical uncertainty of whether a product will produce the desired clinical outcomes, or the market-related uncertainty of whether a product will be outperformed by its competitors Solutions to Overcome the Challenges: Used Oracle Crystal Ball to devise a Monte-Carlo-based approach to better analyze and define the values and risks of the company’s development portfolio, laying the groundwork for optimized decision-making Enabled a better understanding of the range of potential values and risks to improve portfolio planning Enabled detailed analysis of the likelihood of favorable or unfavorable outcomes, such as the likelihood of whether Merck Serono can meet its sales targets planned for the next ten years with its existing product portfolio Gained the ability to take into account correlative risks, synergies and project interactions, enabling Merck Serono to better forecast what the company may achieve—for example, that there is a 70% probability of a particular sales target being met Established Monte-Carlo-based analysis using Oracle Crystal Ball as a useful element in decision-making at the board level, as the approach provides a better analysis of values and risks associated with the company’s product portfolio “Oracle Crystal Ball enables us to make Monte Carlo simulations of the potential value and sales of our development portfolio. It is a very powerful tool for gaining a thorough understanding and improved awareness of value drivers, uncertainties, and risks, along with associated probabilities.” – Riccardo Lampariello, Associate Director, Merck Serono S.A Why Oracle “We chose Oracle Crystal Ball to enable us to perform Monte Carlo analysis, which gives us a deeper understanding and improved awareness of the value drivers, uncertainties and risks of our portfolio of development projects,” said Kimber Hardy, head of valuation and analysis, Merck Serono S.A. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Click here to read the full version of the customer success story Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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• Right approach to convert a word document that contains forms in a web app

  - by carlo

  I would know if someone can suggest a good approach to convert a word document that contains forms in a web app, specifically in an application built with WaveMaker.(but I'm curious also with a general approach not strictly dependent on the technology that I have mentioned). For example, if I have a page in a word document, that maps the fields of a user entity, what could be my "programmer approach" to convert it without much use of copy-paste, but with a dynamic methodology ?

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• Update to kernel 3.12 seems to fail: uname reports old rc7

  - by carlo

  I currently run Xubuntu 13.10 with kernel 3.12 rc7. Today I tried updating to the latest 3.12 kernel (non-rc), but this seems to fail. When installing the image and headers I see the following error passing by: ... run-parts: executing /etc/kernel/postinst.d/dkms 3.12.0-031200-generic /boot/vmlinuz-3.12.0-031200-generichis Error! The dkms.conf for this module includes a BUILD_EXCLUSIVE directive which does not match this kernel/arch. This indicates that it should not be built. ... After rebooting, when I do uname -r or cat /proc/version it tells me that I'm still running on the old rc7 kernel. Since my microphone wasn't working on my Sony Vaio Pro 13 I did download and install the latest ALSA drivers using the oem-audio-hda-daily-dkms package which seem to fix the problem (with the mic). Maybe this has something to do with it? I also tried removing the package using sudo apt-get purge oem-audio-hda-daily-dkms but no success.

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• Can't boot Ubuntu 12.04

  - by carlo

  I installed 12.04 on my windows vista laptop. I wanted to make run Ubuntu and ditch windows. I selected to delete disk and install 12.04. It won't let boot 12.04 with out the install disk. When I turn on my laptop now it goes to a black screen with a blinking cursor. I have to power off then insert Ubuntu 12.04 cd as if it wants me to reinstall. I checked the drive and Ubuntu is there with some of my other saves as well. Can someone help me please?

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• How to change a DateTime Format

  - by Carlo Adap

  List<DateTime> datetimerange = new List<DateTime>(); DateTime StartDate = Convert.ToDateTime(txtDate.Text); DateTime EndDate = Convert.ToDateTime(TextBox1.Text); foreach (DateTime day in EachDay(StartDate, EndDate)) { datetimerange.Add(day.Date); Session["SelectedDatess"] = datetimerange; } When I displays it to a list box the date looks like 8/28/2012 12:00:00 whereas I just want to display 8/28/2012. How can I change the format of the date to MM/dd/yyyy?

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• Windows 7 IIS problem

  - by Carlo

  Hi, the thing is that I just installed IIS in my Windows 7 computer to test it out, but I'm getting this error as soon as I try to load the localhost on my web browser: Service Unavailable HTTP Error 503. The service is unavailable. I found this solution but it didn't work. Anyone has an idea of what's going on? Thanks! More Info: I checked on the Application Pools, as soon as I go to http://localhost/ it stops the application pool of thw website I try.

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• Running qinet on windows 7

  - by Carlo

  Hello. Last week I was running this tn5257 emulator for as400. And no I can't as soon as it starts it closes down. I already turned off the firewall thinking it could be that, but it isn't. I'm just wondering if it was an update or something I can fix. Here's a video of what happens. Any info will be greatly appretiated. Thanks!

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• ArchBeat Link-o-Rama for November 30, 2012

  - by Bob Rhubart

  Oracle SOA Database Adapter Polling in a Cluster: A Handy Logical Delete Pattern | Carlo Arteaga "Using the SOA database adapter usually becomes easier when the adapter is simply viewed and treated as a gateway between the Oracle SOA composite world and the database world," says Carlo Arteaga. "When viewing the adapter in this light one should come to understand that the adapter is not the ultimate all-in-one solution for database access and database logic needs." OIM 11g : Multi-thread approach for writing custom scheduled job | Saravanan V S Saravanan shares insight and expertise relevant to "designing and developing an OIM schedule job that uses multi threaded approach for updating data in OIM using APIs." When Premature Optimization Isn't | Dustin Marx "Perhaps the most common situations in which I have seen developers make bad decisions under the pretense of 'avoiding premature optimization' is making bad architecture or design choices," says Dustin Marx. Protecting Intranet and Extranet Applications with a Single OAM 11g Deployment | Brian Eidelman Oracle Fusion Middleware A-Team member Brian Eideleman's post, part of the Oracle Access Manager Academy series, explores issues and soluions around setting up a single OAM deployment to protect both intranet and extranet apps. Thought for the Day "Never make a technical decision based upon the politics of the situation, and never make a political decision based upon technical issues." — Geoffrey James Source: SoftwareQuotes.com

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• WPF TreeView Virtualization

  - by Carlo

  I'm trying to figure out this virtualization feature, I'm not sure if I'm understanding it wrong or what's going on, but I'm using the ANTS memory profiler to check the number of items in a virtualized TreeView, and it just keeps increasing. I have a TreeView with 1,001 items (1 root, 1000 sub-items), and I always get up to 1,001 TreeViewItems, 1,001 ToggleButtons and 1,001 TextBlocks. Isn't virtualization supposed to re-use the items? If so, why would I have 1,001 of each? Also, the CleanUpVirtualizedItem never fires. Let me know if I'm understanding this wrong and if you have resources on how to use this. I've searched over the internet but haven't found anything useful. EDIT: Even the memory used by the tree grows from aporx. 4mb to 12mb when I expand and scroll through all the items. Let me know thanks. This is my code. XAML: <Window x:Class="RadTreeViewExpandedProblem.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <TreeView x:Name="treeView" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.CleanUpVirtualizedItem="TreeView_CleanUpVirtualizedItem"> <TreeView.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel /> </ItemsPanelTemplate> </TreeView.ItemsPanel> </TreeView> </Grid> </Window> C#: public partial class Window1 : Window { public Window1() { InitializeComponent(); TreeViewItem rootItem = new TreeViewItem() { Header = "Item Level 0" }; for (int i = 0; i < 1000; i++) { TreeViewItem itemLevel1 = new TreeViewItem() { Header = "Item Level 1" }; itemLevel1.Items.Add(new TreeViewItem()); rootItem.Items.Add(itemLevel1); } treeView.Items.Add(rootItem); } private void TreeView_CleanUpVirtualizedItem(object sender, CleanUpVirtualizedItemEventArgs e) { } }

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• WPF binding ComboBox to enum (with a twist)

  - by Carlo

  Well the problem is that I have this enum, BUT I don't want the combobox to show the values of the enum. This is the enum: public enum Mode { [Description("Display active only")] Active, [Description("Display selected only")] Selected, [Description("Display active and selected")] ActiveAndSelected } So in the ComboBox instead of displaying Active, Selected or ActiveAndSelected, I want to display the DescriptionProperty for each value of the enum. I do have an extension method called GetDescription() for the enum: public static string GetDescription(this Enum enumObj) { FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString()); object[] attribArray = fieldInfo.GetCustomAttributes(false); if (attribArray.Length == 0) { return enumObj.ToString(); } else { DescriptionAttribute attrib = attribArray[0] as DescriptionAttribute; return attrib.Description; } } So is there a way I can bind the enum to the ComboBox AND show it's content with the GetDescription extension method? Thanks!

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• Books about Advanced WPF control building

  - by Carlo

  Hello. I'm really interested in learning really advanced features of WPF to learn how to create advanced controls, but apparently I'm running out of resources, and possibly, imagination. I have these 4 books: WPF Control Development Unleashed Experiences Pro WPF 2008 Presentation Professionals Programming WPF Chris Sells WPF in Action Visual Studio 2008 One finished, two other half way, the other one just started. I sort of expected more from the "WPF Control Development Unleashed" one. Anyway, do you know any more books about advanced WPF features, and control building? Or even about how WPF works internally. Let me know what are your favorite WPF books, maybe I've overlooked some of them. Thanks!

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• Microsoft WPF Certification

  - by Carlo

  I'm seriously thinking about getting this certification. I already contacted Apex InfoTech and they gave me prices and everything. This is the description of the course. It lasts for 3 days, and the price is $1,495. What do you guys think, is it worth it? I've already been using WPF for a a bit more than a year, but I think a little Microsoft Certification badge would be good for my business card and resume. Let me know what you think. Thanks!

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• Drawing a FrameworkElement within another FrameworkElement

  - by Carlo

  Hello I have this code: public class VisualCue : FrameworkElement { public List<Indicator> Indicators { get; set; } public VisualCue() { this.Indicators = new List<Indicator>(); } protected override int VisualChildrenCount { get { return this.Indicators.Count; } } protected override Visual GetVisualChild(int index) { return this.Indicators[index]; } } public class Indicator : FrameworkElement { protected override void OnRender(DrawingContext context) { context.DrawEllipse(Brushes.Red, new Pen(Brushes.Black, 2), new Point(0, 0), 10, 10); base.OnRender(context); } } And in XAML: <local:VisualCue x:Name="visualCue"> <local:VisualCue.Indicators> <local:Indicator /> </local:VisualCue.Indicators> </local:VisualCue> But the indicator doesn't get drawn. What am I missing?

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• Lists NotifyPropertyChanging

  - by Carlo

  Well BindingList and ObservableCollection work great to keep data updated and to notify when one of it's objects has changed. However, when notifying a property is about to change, I think these options are not very good. What I have to do right now to solve this (and I warn this is not elegant AT ALL), is to implement INotifyPropertyChanging on the list's type object and then tie that to the object that holds the list PropertyChanging event, or something like the following: // this object will be the type of the BindingList public class SomeObject : INotifyPropertyChanging, INotifyPropertyChanged { private int _intProperty = 0; private string _strProperty = String.Empty; public int IntProperty { get { return this._intProperty; } set { if (this._intProperty != value) { NotifyPropertyChanging("IntProperty"); this._intProperty = value; NotifyPropertyChanged("IntProperty"); } } } public string StrProperty { get { return this._strProperty; } set { if (this._strProperty != value) { NotifyPropertyChanging("StrProperty"); this._strProperty = value; NotifyPropertyChanged("StrProperty"); } } } #region INotifyPropertyChanging Members public event PropertyChangingEventHandler PropertyChanging; #endregion #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion public void NotifyPropertyChanging(string propertyName) { if (this.PropertyChanging != null) PropertyChanging(this, new PropertyChangingEventArgs(propertyName)); } public void NotifyPropertyChanged(string propertyName) { if (this.PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public class ObjectThatHoldsTheList : INotifyPropertyChanging, INotifyPropertyChanged { public BindingList<SomeObject> BindingList { get; set; } public ObjectThatHoldsTheList() { this.BindingList = new BindingList<SomeObject>(); } // this helps notifie Changing and Changed on Add private void AddItem(SomeObject someObject) { // this will tie the PropertyChanging and PropertyChanged events of SomeObject to this object // so it gets notifies because the BindingList does not notify PropertyCHANGING someObject.PropertyChanging += new PropertyChangingEventHandler(someObject_PropertyChanging); someObject.PropertyChanged += new PropertyChangedEventHandler(someObject_PropertyChanged); this.NotifyPropertyChanging("BindingList"); this.BindingList.Add(someObject); this.NotifyPropertyChanged("BindingList"); } // this helps notifies Changing and Changed on Delete private void DeleteItem(SomeObject someObject) { if (this.BindingList.IndexOf(someObject) > 0) { // this unlinks the handlers so the garbage collector can clear the objects someObject.PropertyChanging -= new PropertyChangingEventHandler(someObject_PropertyChanging); someObject.PropertyChanged -= new PropertyChangedEventHandler(someObject_PropertyChanged); } this.NotifyPropertyChanging("BindingList"); this.BindingList.Remove(someObject); this.NotifyPropertyChanged("BindingList"); } // this notifies an item in the list is about to change void someObject_PropertyChanging(object sender, PropertyChangingEventArgs e) { NotifyPropertyChanging("BindingList." + e.PropertyName); } // this notifies an item in the list has changed void someObject_PropertyChanged(object sender, PropertyChangedEventArgs e) { NotifyPropertyChanged("BindingList." + e.PropertyName); } #region INotifyPropertyChanging Members public event PropertyChangingEventHandler PropertyChanging; #endregion #region INotifyPropertyChanged Members public event PropertyChangedEventHandler PropertyChanged; #endregion public void NotifyPropertyChanging(string propertyName) { if (this.PropertyChanging != null) PropertyChanging(this, new PropertyChangingEventArgs(propertyName)); } public void NotifyPropertyChanged(string propertyName) { if (this.PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } Sorry, I know this is a lot of code, which takes me back to my main point IT'S A LOT OF CODE to implement this. So my question is, does anyone know a better, shorter, more elegant solution? Thanks for your time and suggestions.

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