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  • How to fire off a asych thread in a web application, and gaurantee only 1 thread fires?

    - by Blankman
    I want to cache a object in memory. Regenerating the object when the cache expires is fairly expensive, so I want to do the following: When the cache is "about" to expire, I want to fire off a asychronous thread that will go and rebuild the object and then reset the cache. One thing I am worry about is multiple threads firing to fetch the object to cache, I only want a single thread doing this, realizing many people will be hitting the website. This might not be the best use case to do this, but I want to know how to do this sort of thing.

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  • problem with DataReader ASP.NET (Visual Basic)

    - by ZiGi
    Hey, I have this problem : [InvalidOperationException: No data exists for the row / column.] System.Data.OleDb.OleDbDataReader.DoValueCheck(Int32 ordinal) +1029063 System.Data.OleDb.OleDbDataReader.GetInt32(Int32 ordinal) +12 ASP.addsousvoyage_aspx.hdVoyage_SelectedIndexChanged(Object sender, EventArgs e) in C:\Users\ZiGi\Desktop\VisualDesign\addSousVoyage.aspx:222 System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +111 System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() +134 System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +10 System.Web.UI.Page.RaiseChangedEvents() +165 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1485 When I do this : MsgBox(myReader1.GetInt32(0).ToString) Even if : MsgBox(myReader1.FieldCount) returning 1 as value and the field(0) is integer. What's the problem ?

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  • Fix for Visual Studio 2005 not showing filename or line on errors in web pages when compiling?

    - by spoulson
    A project I'm on requires Visual Studio 2005. One annoyance is that when a website project in the solution, any compile errors from .aspx or .ascx files show up like: (0,0): warning CS0168: The variable 'ex' is declared but never used (0,0): warning CS0162: Unreachable code detected (0,0): warning CS0168: The variable 'ex' is declared but never used (0,0): warning CS0168: The variable 'ex' is declared but never used How can I track these down? Is there an option I'm missing that gives me filename and line numbers?

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  • How can I get the fully qualified name of an assembly from it's basic name?

    - by GenericTypeTea
    I'm currently writing a custom forms application that allows a user to design a data capture form. I store the field's ControlType and ControlAssembly in the database and then create them on the forms at runtime. For example: ControlType = `System.Web.UI.WebControls.TextBox`. ControlAssembly= `System.Web`. So I can therefor create a fully qualified name and create the control doing the following: string target = Assembly.CreateQualifiedName("System.Web", field.ControlType); Type type = Type.GetType(target); Control control = Activator.CreateInstance(type) as Control; But, this will cause an error as "System.Web" is not a valid assembly name. The assembly name itself has to be fully qualified, i.e. System.Web.Extensions would be: "System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Is there any way I can get the fully qualified name of the assembly System.Web without having to store the entirity of the version, culture and PKT?

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  • Most effective server side programming language for web development?

    - by ihaveitnow
    This is more a question of pros/cons between PHP and JAVA. Iv been doing research, and iv narrowed it down to those two. And in consideration, id like to go into mobile app dev...So thats +1 for Java. Time taken to learn the language is not an issue...Just would like to know which is the most profitable at the end of all the training. And on a slight note. Can Javascript work with Java? And what is the real advantage of that?

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  • How can I load a web page inside of a jQuery dialog box?

    - by kielie
    Hi, I am designing a wordpress template, and I would like to use jQuery ui to display each of the calendar links in a dialog box, when they are clicked. What I want, is when someone clicks on a link in the wordpress calendar, the content will load in the dialog box, and display over the calendar. I would appreciate any help on this, thanx in advance!

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  • How to build a windows/web application that stores data locally and sync's with remote database?

    - by Jason
    Hello, I am needing to build an application that stores data locally and then synchronizes with a remote MS SQL database. I am not sure how to go about doing this. Enter data offline on a form and store the data. Synchronize the data with a remote MS SQL database when online. There will be many users who enter data offline, the local database on each pc needs to update when online and grab the 30 most recent records for use offline. Example: Each day users will enter data on their "form". The users will be offline. The users will return to the office and need to sync with the "online" database. The next morning the users will need to sync with the online database before going offline. They will need to have offline access to the 30 most recent records. (They will use the 30 records for charting/graphing while they are offline) I am very new to building apps. I have VS 2010. I am wondering where to start? What language to use? Is there a "framework" for doing this type of app? Any info or suggestions would be greatly appreciated. Thanks!

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  • How to make validation for a textbox that accept only comma(,) & digit in c# web application?

    - by prateeksaluja20
    Hello Experts, I am working on a website.I am using C# 2008.I want to make a text box that accept only numbers & comma(,). for example-919981424199,78848817711,47171111747 or there may be a single number like 919981424199. I was able to do one thing My text box only containing number by using this Regular Expression validation.in its property-Validation Expression i wrote "[0-9]+". This is working but now my requirement is to send bulk SMS & each number is separated by (,). I tried a lot but not getting the ans.so please help me to sort out this problem. Thanks in advance.

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  • Why does the web page I fetch with Perl look odd?

    - by Tichomir Mitkov
    I have a Perl script to open this page http://svejo.net/popular/all/new/ and filter the names of the posts but except headers everything seems encrypted. Nothing can be read. When I open the same page in a browser everything looks fine including the source code. How is it possible to encrypt a page for a script and not for a browser? My Perl script sends the same headers as my browser (Google Chrome).

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  • How can I kill off a Python web app on GAE early following a redirect?

    - by Mike Hayes
    Hi Disclaimer: completely new to Python from a PHP background Ok I'm using Python on Google App Engine with Google's webapp framework. I have a function which I import as it contains things which need to be processed on each page. def some_function(self): if data['user'].new_user and not self.request.path == '/main/new': self.redirect('/main/new') This works fine when I call it, but how can I make sure the app is killed off after the redirection. I don't want anything else processing. For example I will do this: class Dashboard(webapp.RequestHandler): def get(self): some_function(self) #Continue with normal code here self.response.out.write('Some output here') I want to make sure that once the redirection is made in some_function() (which works fine), that no processing is done in the get() function following the redirection, nor is the "Some output here" outputted. What should I be looking at to make this all work properly? I can't just exit the script because the webapp framework needs to run. I realise that more than likely I'm just doing things in completely the wrong way any way for a Python app, so any guidance would be a great help. Hopefully I have explained myself properly and someone will be able to point me in the right direction. Thanks

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  • Why ASP.NET menu control ignores roles in Web.sitemap?

    - by MainMa
    Hi, I have a website with a menu based on sitemap. ActiveDirectoryRoleProvider is a custom class. securityTrimmingEnabled of sitemap provider is set to true. Now, nevertheless the roles set in the sitemap file, site menu displays every sitemap entity. So for example if I have in sitemap a node with roles="*", a second one with roles="Administrators" and a third one with roles="Foo" and I login as a member of Administrators group but not Foo group, the site menu will display all three items. On the other hand, if I have a node which does not specify roles attribute but has children, this node will never be displayed. If I put: <%= HttpContext.Current.User.IsInRole("Administrators") ? "Admin" : "Not admin"%> <%= HttpContext.Current.User.IsInRole("Foo") ? "Foo" : "Not foo"%> before the menu, it displays that I'm Admin, but Not foo, which is just fine. So if it knows that I'm Admin but Not foo, why does it continue to display Foo's sitemap nodes? Note: changing authorizations has no effect on the menu. It continues to show every item, even for the pages I'm unable to access.

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  • Why would the same web form control render different "onclick" logic based on the page structure?

    - by zk812
    It was hard to title this question. :) I have a user control that is used to display a list of lookup items in my database and a delete button for each item (Editor User Control below). The delete button has an onClientClick event used to display a confirmation dialog in JavaScript. On page one, the confirmation pops up and functions correctly. The overall structure is: Master Page Page Editor User Control List of items with delete button On page two, the confirmation pops up but regardless of the answer, the page posts back anyway. The structure of this page is: Master Page Page User Control Editor User Control List of items with delete button For some reason, this makes a difference in how the delete button is rendered. Page one: <input type="image" name="ctl00...RequestTypesDataList$ctl01$ctl01" src="Images/Disable.png" alt="Delete" onclick="return ProcessDeleteCommand(1);" /> Page two: <input type="image" name="ctl00...RequestTypesDataList$ctl07$ctl01" src="Images/Disable.png" alt="Delete" onclick="return ProcessDeleteCommand(2);WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$ContentPlaceHolder1$RequestCreator1$RequestTypeEditor1$RequestTypesDataList$ctl07$ctl01&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" /> Does anyone know why page two renders WebForm_DoPostBackWithOptions after my JS check? It's causing the postback regardless of the confirmation choice.

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  • Disadvantages of hard coding credentials? What's the resolution?

    - by SeeBees
    I am building a Sharepoint web part that will be used by all users. The web part connects to a web service which needs credentials with higher privileges than common users. I hard coded credentials in the web part's code. query.Credentials = new System.Net.NetworkCredential("username", "password", "domain"); query is an instance of the web service class This may not be a good approach. In regard with security, source code of the web apart is available to people who are not allowed to see the credential. This is bad enough, But is there any other drawback of this approach? How to prevent hard coding credentials into the source code? Thanks

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  • How do the do that? Transparent foreground on a web page

    - by Jim Beam
    I really can't find the right Google terms to track this down. But you're all quite smart so thought I'd post it here. You know how sometimes you are on a good site and you click a button (like to submit a form) and the form doesn't go away, instead, the foreground becomes transparent and it contains a message of some kind, or another page. The message is at the forefront but the previous page is still mostly visible behind it - how do they do that? I'm assuming it's an AJAX-esque trick.

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  • How do you share pre-calculated data between calls to a Rails web service?

    - by Nigel Thorne
    I have a Rails app that allows users to build up a network structure and then ask questions about how to navigate around it. When adding nodes and connections these are just saved to the database. At the point you make a query of the network I calculate the shortest path from any node to any other node. Constructing this in memory takes a while (something I need to fix), but once it is there, you can instantly get the answer to any of these path questions. The question is... How do I share this network between calls to the website, so each request doesn't regenerate the paths network each time? Note: I am hosting this on apache server using passenger (mod ruby) Thoughts?

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