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• Why does derivative trading position always require C++ knowledge?

  - by Jeffrey

  I’ve never worked in trading environment before and I was curious to see that few of the trading houses seem to use C# but most of them do heavily rely on C++. Why is it? Is it because C++ is better performance wise? Is it because of legacy code base? Is it because cross platform issue? What about dynamic languages (ruby, python)? Are they too slow for this kind of work in terms of performance? Updated: If realibility and performance are important would "Erlang" be the "next big thing" in trading platform?

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• Add UserControl To Page From Another Class

  - by Raika

  I have page and call method inside my page. I want to add some control to my page Control (not page itself) inside that method. namespace Program { public partail class Default : Page { protected void Page_Load(object sender, Eventargs e) { MyClass.Calling(this); } } } in another class namespace Program { public class MyClass { public static void Calling(Page page) { Textbox txt = new Textbox() // I want somthing like this. // page.PlaceHolder1.Controls.Add(txt); } } } Is this possible? My Default.aspx : <%@ Page Title="Home Page" MasterPageFile="~/Site.master" ... %> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder> </asp:Content> Update: thanks to The King for help. his suggest work correctly if control is inside page not Content of master page like my defualt sample code.

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• Possible to bind an event listener to a (hypothetical) onChangeInnerHTML event?

  - by DustMason

  In my app, I have an OL tag whose contents are changed by various other dynamic events. Is there some way to put a listener on that OL so that I can execute a function whenever its contents are altered in any way? In this example I need to update a count of items in the list which appears in another spot in the interface. I am using jQuery if that helps. The contents of the OL are being changed with OL.append() and LI.remove(), in case those methods have some special events that I don't know about Thanks!

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• How to Add Horizontal line in Javascript

  - by user54197

  I would like to add a horizontal seperating line on a dynamic populated table. How do I do this? Below is a snippet. function addNewRow() { $('#displayTable tr:last').after('<tr><td style="font-size:smaller;" class="dataField1"></td><td style="font-size:smaller;" class="dataField2"></td><td style="font-size:smaller;" class="dataField3"></td></tr>'); var $tr = $('#displayTable tr:last'); $tr.find('.dataField1').text($('#txtName').val()); $tr.find('.dataField2').text($('#txtAddress').val()); $tr.find('.dataField3').text('document.write("<tr><td colspan=\"2\"><hr \/><\/td><\/tr>"); }

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• Setting focus on top of the page on click of asp.net link button

  - by user74042

  I've a asp.net datagrid which shows customer order details. Pagination at the bottom of the grid is done using datalist and asp.net Linkbutton controls. Here is the code: <asp:DataList ID="DataList2" runat="server" CellPadding="1" CellSpacing="1" OnItemCommand="DataList2_ItemCommand" OnItemDataBound="DataList2_ItemDataBound" RepeatDirection="Horizontal"> <ItemTemplate> <asp:LinkButton ID="lnkbtnPaging" runat="server" CommandArgument='<%# Eval("PageIndex") %>' CommandName="lnkbtnPaging" Text='<%# Eval("PageText") %>'></asp:LinkButton> <asp:Label runat="server" ID="lblPageSeparator" Text=" | " name=></asp:Label> </ItemTemplate> </asp:DataList> When the user clicks on any page number(ie.Link button), I need to set focus on top of the page. How do i do this? Thanks!

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• Should I use WPF or Windows Forms Application for my project in C#?

  - by RAJ K

  I am developing a Client-Server based application in which client application will access server database to store billing information. It will also have report generation facility. Windows Forms is good in document printing & I don't see such facility or controls in WPF. If I am wrong then please correct me. I want database security, which DB should I use, SQL Server, MySQL or Oracle. I would like to use free DB but security is my priority. Please suggest how I can implement a Client-Server architecture with multiple clients in C#? Thank you Geeks!!!

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• How to presist the user authentication in SL3 + RIA

  - by Nair

  I am developing SL3 + RIA services with custom authentication. I followed the example in http://code.msdn.microsoft.com/RiaServices/Release/ProjectReleases.aspx?ReleaseId=2661 to implement custom authentication. Based on the implementation, you first do login request from client to service. This request is async process. Since login is async, the control will go back to GUI which then starts to do data bind in SL controls using RIA services, the services happens to requires the authentication to be successful (by adding [RequireAuthentication] attribute). The trouble is, since you requested login might not have completed before the data binding starts t this stage the authentication is false because of that data binding will fail. I would like to know if you require your web services to have 'RequireAuthentication' how would you wait for authentication to complete at the server side or client side. Appriciate the help. Thanks,

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• How to Execute Page_Load() in Page's Base Class?

  - by DaveDev

  I have the following PerformanceFactsheet.aspx.cs page class public partial class PerformanceFactsheet : FactsheetBase { protected void Page_Load(object sender, EventArgs e) { // do stuff with the data extracted in FactsheetBase divPerformance.Controls.Add(this.Data); } } where FactsheetBase is defined as public class FactsheetBase : System.Web.UI.Page { public MyPageData Data { get; set; } protected void Page_Load(object sender, EventArgs e) { // get data that's common to all implementors of FactsheetBase // and store the values in FactsheetBase's properties this.Data = ExtractPageData(Request.QueryString["data"]); } } The problem is that FactsheetBase's Page_Load is not executing. Can anyone tell me what I'm doing wrong? Is there a better way to get the result I'm after? Thanks

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• Can a flex app (or a portion of a flex app) be made transparent to mouse clicks?

  - by Sam Jones

  I need to superimpose my Flex app above a plain HTML control on a web page, and be able to click through the Flex app to interact with the HTML control. Is there any way to do this? No permutation of mouseEnabled="false" or mouseChildren="false" seems to have the desired effect. Context: trying to integrate Google Earth API (JavaScript/HTML) with my flex app. I am leaving a portion of the flex app transparent and empty, and positioning the Google Earth widget just below that point in the z-index. Google Earth has to be behind flex, because there are some Flex controls periodically displayed in that space.

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• How to add jQuery UI Button icons to input buttons?

  - by jrummell

  Is it possible to use jQuery UI Button icons with <input type="submit"> elements? The documentation example uses <button> elements, but it does not explicitly say whether or not icons work with input buttons. I'd like to add icons to ASP.NET Button controls which render as <input type="submit">. This is what I've tried: $("input.add").button({ icons: { primary: "ui-icon-circle-plus" } }); The button is styled correctly except for the missing icon. Am I missing something?

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• Linux binary built for 2.0 kernel wouldn't execute on 2.6.x kernel.

  - by lorin

  I was installing a binary Linux application on Ubuntu 9.10 x86_64. The app shipped with an old version of gzip (1.2.4), that was compiled for a much older kernel: $ file gzip gzip: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.0.0, stripped I wasn't able to execute this program. If I tried, this happened: $ ./gzip -bash: ./gzip: No such file or directory ldd was similarly unhappy with this binary: $ ldd gzip not a dynamic executable This isn't a showstopper for me, since my installation has a working version of gzip I can use. But I'm curious: What's the most likely source of this problem? A corrupted file? Or a binary incompatibility due to being built for a much older {kernel,libc,...}?

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• Multiple sections on landing page only

  - by RDRAO

  Hi every one, I am very much new to Drupal but am loving it to start with. I got struck at a point with respect to theaming. I have a region called 'footer-teaser' just above footer. Its width is 800px. its been split into 3 equal size columns. Each column has the following. Image of size 120x120 Some teaser text Link to 'read more' The design requirement is all the above should be editable by the admin from the admin interface. If its static i would have hardcoded this but since the requirement is dynamic, i am not aware of how to achieve this. I have customised page.tpl for other sections of the page except this. I am sure someone else would have faced this issue before and was wondering if anyone can direct me in the right direction? Even better if an example is provided. Cheers RD

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• How do I create a WPF Dropdown panel

  - by Mitch

  I'd like to create a dropdown panel in WPF the acts like a ComboBox/Expander hybrid. I'm currently using an Expander but it pushes the the controls underneath it down when it expands. I simply want it to act like a ComboBox and overlay it's dropdown. I've looked at using Popups but they don't move with the underlying window if it's moved. So, I've concluded that the closest control to my needs is a ComboBox with allows me to put a Grid or StackPanel into its dropdown area. Any ideas how to achieve this?

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• Passing a web service an unknown number of parameters

  - by Billyhole

  I'm relatively new to utilizing web services. I'm trying to create one that will be accepting data from a ASP.Net form whose input controls are created dynamically at runtime and I don't how many control values will be getting passed. I'm thinking I'll be using jQuery's serialize() on the form to get the data, but what do I have the web service accept for a parameter? I thought maybe I could use serializeArray(), but still I don't know what type of variable to accept for the JavaScript array. Finally, I was thinking that I might need to create a simple data transfer object with the data before sending it along to the web service. I just didn't wanna go through with the DTO route if there was a much simpler way or an established best practice that I should follow. Thanks in advance for any direction you can provide and let me know I wasn't clear enough, or if you have any questions.

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• What is the best practice for accessing Model using MVVM pattern

  - by Dzenand

  I have a database that communicates with webservices with my Model (own thread) and exposes Data Objects. My UI application consists of different Views and ViewModels and Custom Controls. I'm using ServiceProvider (IServiceProvider) to access the Model and route the events to the UI thread. Communication between the ViewModels is handeled by a Messenger. Is this way to go? I was also wondering what is the best way to strucutre the DataObjects At the moment i have the DataObjects that have a hierarchy structure but does not support INotifyProperty though the children list are of type of ObservableCollection. I have no possiblity to implement notifypropertychange on the properties. I was wondering the best way of making them MVVM friendly. Implementing a partial class and adding all the properties or commands that are necessary or wrapping all the DataObjects and keep the Model list and MVVM list in sync. All thoughts and ideas are appreciated.

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• how to send multiple commands to a file in cron??

  - by developer

  I have a file that is having some multiple dynamic parameters.I want to send these parameters at the time of writing a file in main cron file. Something like this - */15 * * * * /usr/bin/php /a/b/c.php parameter1 parameter2 parameter3 parameter4 Now i tried working this up but my file is not executing. What im concerned about is that how will my php file will fetch these parameters ?? And how will i write this command when there is only 2 parameters to be passes parameter1 and parameter4??? and how will my cron and php will recognoze that which parameter is for which data and all?? please advice!!

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• How to get ListView to grow to the size of content

  - by Jared

  So I have a fairly complex activity the parent being a linearlayout with a table with some basic info and buttons. Then a couple listviews that the user can add items to. So these listviews grow more and more as the user uses the app. The problem I'm running into is the Linearlayout is bigger then the resolution of the screen and so it needs to scroll. So the scrolling doesn't work on the Listviews. I've tried playing with changing the layout_height of the listview and its child element with no success. Is there a way to make these couple listviews expand out to the amount of children? Or am I going about this all wrong? If so what other controls can I use? I'm open to any ideas. I really just don't know how to go about this. Thanks

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• how to prevent myControl.g.cs from overwriting with wrong base class

  - by Jonny Cundall

  I've got two custom cursors for my app, MyCursor and MyOtherCursor, both of which were designed in xaml, and I added some behaviour in the xaml.cs for each of them. This behaviour was the same for both so I had them inherit from a base class to reduce code duplication. public partial class myCursor: CursorBase { public InterchangeCursor() { InitializeComponent(); } } public class CursorBase : UserControl { public virtual void MoveTo(Point pt) { this.SetValue(Canvas.LeftProperty, pt.X); this.SetValue(Canvas.TopProperty, pt.Y); } } my problem is that if I change something in the xaml for MyCursor, the MyCursor.g.cs file is regenerated, and instead of inheriting from CursorBase, the partial class in the g.cs inherits from System.Windows.Controls.UserControl. Since the other side of the partial class in the xaml.cs file still inherits CursorBase, a build error occurs. I'm finding it annoying fixing the g.cs file each time. Does anyone know how to prevent this happening?

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• How to Generate Embeddable Widgets, and Return PartialView, JS & CSS as JSONP?

  - by DaveDev

  I found this question which is a great starting point towards creating embedded widgets that enable showing dynamic content on remote sites (i.e. a different domain). One problem I'm having is with the following code: public ActionResult SomeAction() { return new JsonpResult { Data = new { Widget = "some partial html for the widget" } }; } It says Widget = "some partial html for the widget" but this doesn't really mean anything to me. I assume that Widget would contain the HTML representing what the user wants to see on the screen, but How do I get the contents of my Partial View into Widget? Can anyone point me in the right direction? Thanks..

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• User control attributes at design-time

  - by ciscoheat

  I'm testing a simple User Control in Visual Studio 2008: A Panel named Wrapper with some controls inside. Can Visual Studio handle this at design time? public partial class TestControl : System.Web.UI.UserControl { [Description("Css class of the div around the control.")] [CssClassProperty] public string CssClass { get { return Wrapper.CssClass; } set { Wrapper.CssClass = value; } } } When setting the CssClass property, it doesn't update the css of the Panel at design time. Am I hoping for too much?

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• WPF: Hidden parent and visible child

  - by oakskc

  As of last night, I decided to start learning about WPF and have been reading through a number of online tutorials and books. This is a huge shift. One feature that has fascinated me is the implicit property value inheritance. I know in the WinForms world, if a control is not visible then neither are any of the child controls. Same seems to be true in the WPF world, as expected. I wondered if explicitly setting the child control's Visibility property would allow for an invisible parent and visible child and it did not. Is this something that would be possible in WPF? Can you have a container control that is hidden with visible children? This is more an exercise of curiosity than anything. I'm still trying to wrap my head around a lot of what I've been reading.

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• How do I find the IP address of a GPRS modem?

  - by Hanno Fietz

  I want to pull data from a device that is accessed via a serial protocol and has a GPRS modem attached which should allow transparent access over an IP connection. It seems to me that this approach is upside down, because how should I know at which IP address the device currently is? Unfortunately, the device itself is rather dumb, so I can't make it send something to my server, which would reveal the current IP. For home routers on dialup lines, there's dynamic DNS services. Is there something equivalent in the mobile world? Each modem would, of course, have its phone number as a reliable address, but how does that help me? Practically all material on GPRS etc. that I can find online seems to be concerned with initiating the connection from the modem side, since that's what the system is designed for.

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• Using Gridview in aspx.vb (code-behind)

  - by Tauron Xavenberg

  I need to create a gridview based on 2 different datasources: main and sub-cathegory. And I need to list them like below: Productinfo sub-product 1 sub-product 2 Productinfo sub-product 1 sub-product 2 sub-product 3 sub-product 4 Etc... the thing is that both the "productinfo" and the "sub-product" are dynamic as the number of both can vary, so I would have to create a gridview within a gridview, plus the necessary filters too. For this reason I thought it was best to do it all in code-behind, but I can't understand how to use the gridview-class in codebehind and bind it so that it actually shows something in the main aspx page. Basically what I'm asking for is a simple example of how, when you have nothing but <asp:GridView/> in the aspx -page, can you add components to it and show it, from code-behind (vb)? Thanks.

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• Does anyone actually use the phrase DHTML anymore?

  - by lafoaug

  I'm not sure if this is exactly appropriate but I have what I think is a interesting question. Does anyone actually use the phrase DHTML anymore in a professional environment? I came across the the word the other day for the first time in years and shuddered at the thought of it. To me the acronym Dynamic HTML just sounds so 1999, it brings me back to the days when I first discovered programming and web development and thought it was awesome to have scripts which modified the status bar and made things fly around the page. I for one have never used the phrase recently and would never dream of saying it in a professional environment to clients or colleges as I feel there is an amateur and dated stigma attached to it. What are your thoughts?

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• Is is possible to make a shaped, alpha-blended dialog?

  - by jgaa

  I'm making a non-rectangular dialog, modelled over an image from Photoshop (the image is the background of the dialog, and the user will see trough the transparent part of the image). I'ts like a dashboard-style window for a media-app with a few custom-drawn controls. Most of the background-image is either opaque or 100% transparent - but in between there is a thin area of partially transparent pixels, ment to blend the image smootly into the background. This works great for web-graphics, but I have not found a way to make this work for Windows windows. I'm using the Windows Template Library (WTL), msvc 2008 - and the app must run on Windows XP as well as Vista and Windows 7. Currently, I'm simply using the opaque part of the background-image to create a GDI clipping-region, but this gives pretty rough edges. Does anyone know about any API functions to accomplish this (part of WTL, or reachable from WTL)?

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