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  • Pattern for managing reference count and object life

    - by Gopalakrishnan Subramani
    We have a serial port which is connected to hundreds of physical devices on the same wire. We have protocols like Modbus and Hart to handle the request and response between the application and devices. The question is related to managing the reference count of the channel. When no device is using the channel, the channel should be closed. public class SerialPortChannel { int refCount = 0; public void AddReference() { refCount++; } public void ReleaseReference() { refCount--; if (refCount <= 0) this.ReleasePort(); //This close the serial port } } For each device connected, we create a object for the device like device = new Device(); device.Attach(channel); //this calls channel.AddReference() When the device disconnect, device.Detach(channel); //this calls channel.ReleaseReference() I am not convinced by the reference count model. Are there any better way to handle this problem in .NET World?

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  • Advice on designing and building distributed application to track vehicles

    - by dario-g
    I'm working on application for tracking vehicles. There will be about 10k or more vehicles. Each will be sending ~250bytes in each minute. Data contains gps location and everything from CAN Bus (every data that we can read from vehicle computer and dashboard). Data are sent by GSM/GPRS (using UDP protocol). Estimated rows with this data per day is ~2000k. I see there 3 main blocks. 1. Multithreaded Socket Server (MSS) - I have it. MSS stores received data to the queue (using NServiceBus). 2. Rule Processor Server (RPS) - this is core of this system. This block is responsible for parsing received data, storing in the database, processing rules, sending messages to Notifier Server (this will be sending e-mails/sms texts). Rule example. As I said between received bytes there will be information about current speed. When speed will be above 120 then: show alert in web application for specified users, send e-mail, send sms text. (There can be more than one instance of RPS). 3. Web application - allows reporting and defining rules by users, monitoring alerts, etc. I'm looking for advice how to design communication between RPS and Web application. Some questions: - Should Web application and RPS have separated databases or one central database will be enough? I have one domain model in web application. If there will be one central database then can I use the same model (objects) on RPS? So, how to send changed rules to RPS? I try to decouple this blocks as much as possible. I'm planning to create different instance of application for each client (each client will have separated database). One client will be have 10k vehicles, others only 100 vehicles.

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  • Weird stack trace in exception "The incoming request does not match any route"

    - by Tassadaque
    i have published asp.net mvc application on iis 6 on the server(windows server 2003) from local machine. On server i have set the default page to default.aspx. but when i try to browse the site on server, it gives me exception "The incoming request does not match any route" One thing i noticed is that. Stack trace on line 5 is shown below. it has one weird thing that exception is still pointing to my local machine path [HttpException (0x80004005): The incoming request does not match any route.] System.Web.Routing.UrlRoutingHandler.ProcessRequest(HttpContextBase httpContext) +15589 System.Web.Routing.UrlRoutingHandler.ProcessRequest(HttpContext httpContext) +40 System.Web.Routing.UrlRoutingHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) +7 **UserManagement._Default.Page_Load(Object sender, EventArgs e) in D:\Evoletpublishnew\UserManagement\UserManagement\Default.aspx.cs:18** System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +50 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

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  • Using Server side method from Javascript without AJAX

    - by Aswin Ramakrishnan
    I have a tricky problem. I am in a situation where I need to use a method defined in a .cs file from a javascript function. The problem is we are using .NET 1.1 and AJAX cannot be used for the application. Also, I will need to pass a string from the javascript to the server side method. The page where I am implementing the javascript is a .as Any ideas? I have tried doing a post back and creating a RaisePostBack event handler method (both in the .aspx page and the .ascx user control) but no luck. It will be greatly appreciated if someone could help me out with the problem.

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  • Converting Makefile to Visual Studio Terminology Questions (First time using VS)

    - by Ukko
    I am an old Unix guy who is converting a makefile based project over to Microsoft Visual Studio, I got tasked with this because I understand the Makefile which chokes VS's automatic import tools. I am sure there is a better way than what I am doing but we are making things fit into the customer's environment and that is driving my choices. So gmake is not a valid answer, even if it is the right one ;-) I just have a couple of questions on terminology that I think will be easy for an experienced (or junior) user to answer. Presently, a make all will generate several executables and a shared library. How should I structure this? Is it one "solution" with multiple projects? There is a body of common code (say 50%) that is shared between the various executable targets that is not in a formal library, if that matters. I thought I could just set up the first executable and then add targets for the others, but that does not seem to work. I know I am working against the tool, so what is the right way? I am also using Visual C++ 2010 Express to try and do this so that may also be a problem if support for multiple targets is not supported without using Visual C++ 2010 (insert superlative). Thanks, this is really one of those questions that should be answerable by a quick chat with the resident Windows Developer at the water cooler. So, I am asking at the virtual water cooler, I also spring for a virtual frosty beverage after work.

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  • MVC Client Validation from Service Layer

    - by GibboK
    I'm following this article http://www.asp.net/mvc/tutorials/older-versions/models-(data)/validating-with-a-service-layer-cs to include a Service Layer with Business Logic in my MVC Web Application. I'm able to pass messages from the Service Layer to the View Model in a Html.ValidationSummary using ModelState Class. I perform basic validation logic on the View Model (using DataAnnotation attributes) and I have ClientValidation enabled by default which displaying the error message on every single field of my form. The Business logic error message which come from the Service Layer are being displayed on Html.ValidationSummary only after Posting the form to the Server. After Validation from the Service Layer I would like highlight one or more fields and have the message from the Service Layer showing on these fields instead that the Html.ValidationSummary. Any idea how to do it? Thanks

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  • New asp "showat" attribute required inconsistently in VS2010. Why?

    - by Patrick Karcher
    When I generate code using T4 templates in Visual Studio 2010, I get the following error for each of my asp controls when I try to compile: Control "ddState" is missing required attribute "showat". I have never gotten this error in previous versions of .NET. Further, I don't get this error when I manually construct my pages either by dragging/dropping, nor do I get it when I type out the control text myself. When I generate code, I have to manually add showat="client" to my tag for the compiler to be happy. It was my understanding that I never had to explicitly specify this tag. The following: <asp:dropdownlist id="ddState" runat="server" showat="client" /> solves the problem. Why do I have to add this to generated code but not other times? (It's a VS-2010 webforms project, using VB, in case that makes a difference.)

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  • Manipulate Page Theme Programatically

    - by Aren B
    I've got the following Setup in my Theme: \App_Themes\Default\StyleSheet.css \App_Themes\Default\PrintStyleSheet.css The PrintStyleSheet.css file has a set of printing css rules set in them wrapped in an @Media Print { } block. I need a way to programmatically remove the PrintStyleSheet.css from the list of css files for ASP.NET to inject based on some flags. (Some instances we want to print the site verbatim without custom formatting). I know i could build a seperate theme without the PrintStyleSheet.css in it and switch the theme programmatically, however this would introduce duplication of my master stylesheet which is not acceptable. Any ideas?

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  • aspnet_reqsql not working at all

    - by user252160
    I would like to create the ASP.NET User database template on a database of my own, because I'd like to fully untegrate the user system with the rest of my DB. As I've read, i needed to use the aspnet_regsql tool. I put all the options (because my database is running on SQLEXPRESS and is in an mdf file in my project's folder). the program starts and seemingly runs without any errors, however, when I open the database after that, not tables or stored procedures have been added. One more thing: I did one more test. I intentionally gave the -d option a wrong mdf file address, and surprisingly, the program "finished" correctly, yet no file was crated or modified whatsoever.

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  • FB Connect: (417) Expectation failed

    - by FearUs
    Hi, I developed a simple ASP.NET app, it was working fine, but now I can't get user info; I am getting this message: The remote server returned an error: (417) Expectation failed. and here's the code I'm using: Dim FBUser As Facebook.Schema.user = Nothing Dim connectSession As Facebook.Session.ConnectSession Dim FBApi As Api connectSession = New Facebook.Session.ConnectSession(ConfigurationManager.AppSettings("AppKey"), ConfigurationManager.AppSettings("AppSecret")) If connectSession.IsConnected() Then FBApi = New Api(connectSession) Try FBUser = FBApi.Users.GetInfo() '' do some work Catch ex As Exception FBUser = Nothing '' other work End Try This is really confusing, because it was just working fine for 2 weeks now !! Thanks

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  • Custom Providers & Design Patterns

    - by Code Sherpa
    Hi. I am using ASP.NET 2.0 and its various providers. I have overridden most of the methods I need and have the following custom providers: ProjectMembershipProvider ProjectProfileProvider ProjectRoleProvider In the design of my project, my intention was to wrap the custom providers in a facade - style design - mixing and matching profiling, membership, and roles in API methods to simplify things for developers. But, I am finding that a lot of the methods in my custom providers don't need to change, really. And, it seems silly to wrap a stand-alone method in another method that does exactly the same thing. So - is my approach wrong? Or, should I allow end - users to instantiate the custom providers when needed and the mix/match api when needed? This seems a bit redundant to me but I can't see another way. Advice appreciated. Thanks.

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  • How to check the Condition?

    - by rockers
    I am new to ASP.NET how to check this condition? int Domestic = 0; int International = 0; My perticular Condition is Domestic ==1 ? DID : International ==1 ? IID : (Domestic + Internationl) this condition is only working for if My Domestic 1 and Internation 0 or Internation 1 Domestic 0 But there is chance that Domestic 1 and Internation 1 or Doemstic > 1 or Internation > 1 if both are having account I need to show them like Level... how to check both are having Counts or not? thanks

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  • Can you have a Dynamic Data Field which consists of a list of fields?

    - by Telos
    This is a purely theoretical question (at least until I start trying to implement it) but here goes. I wrote a web form a long time ago which has a configurable section for getting information. Basically for some customers there are no fields, for other customers there are up to 20 fields. I got it working by dynamically creating the fields at just the right time in the page lifecycle and going through a lot of headaches. 2 years later, I need to make some pretty big updates to this web form and there are some nifty new technologies. I've worked with ASP.NET Dynamic Data just a bit and, well, I half-crazed plan just occurred to me: The Ticket object has a one-to-many relationship to ExtendedField, we'll call that relationship Fields for brevity. Using that, the idea would be to create a FieldTemplate that dynamically generated the list of fields and displayed it. The big questions here would probably be: 1) Can a single field template resolve to multiple web controls without breaking things? 2) Can dynamic data handle updating/inserting multiple rows in such a fashion? 3) There was a third question I had a few minutes ago, but coworkers interrupted me and I forgot. So now the third question is: what is the third question? So basically, does this sound like it could work or am I missing a better/more obvious solution?

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  • Databinding Error when Recreating object

    - by Maxim Gershkovich
    Hi All, Figure there is a simple solution to this problem but I have been unable to find it. I have databinding in an ASP.Net application to a GridView. This gridview is bound to an ObjectDataSource as per standard usage. The problem I have is that one of my bound fields uses the property DataFormatString="{0:C}" and due to the currency format being displayed when an update is attempted and the object recreated I get a error as such "$13.00 is not a valid value for Decimal." Clearly this is a result of the column using a FormatString and then attempting to bind it back to a decimal property I have in my object called UnitPrice. I am assuming there is some markup I can set that can specify how the value is translated back? Thanks in advance for any help.

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  • Make a Linq-to-SQL Generated User Class Inherit from MembershipUser

    - by Adam Albrecht
    I am currently building a custom Membership Provider for my Asp.net MVC website. I have an existing database with a Users table and I'm using Linq-to-Sql to automatically generates this class for me. What I would like to do is have this generated User class inherit from the MembershipUser class so I can more easily use it in my custom Membership Provider in methods such as GetUser. I already have all the necessary columns in the table. Is there any way to do this? Or am I going about this the completely wrong way? Thanks!

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  • How do I get the value of a DynamicControl?

    - by Telos
    I'm using ASP.NET Dynamic Data functionality to do something a little weird. Namely, create a dynamic list of fields as children of the main object. So basically I have Ticket.Fields. The main page lists all the fields for Ticket, and the Fields property has a DynamicControl that generates a list of controls to collect more data. The tricky part is that this list ALSO uses Dynamic Data to generate the controls, so each field can be any of the defined FieldTemplates... meaning I don't necessarily know what the actual data control will be when I try to get the value. So, how do I get the value of a DynamicControl? Do I need to create a new subclass of FieldTemplate that provides a means to get at the value?

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  • Is it possible to bind data asynchronously between two dropdownlists in a view?

    - by user252160
    I'd like to achieve the following effect using ASP.NET MVC and JQuery. I've got a drop down list displaying a list of Countries. I want to make it so that when I change the value of the country, a new drop down list appears below it, showing a list of companies whose country of origin is the particular selected company. The thing is that I do not want to rely too much on controller actions because I'm using it in a Template Helper which is a "headless" view. Can I bind it somehow?

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  • IIS 7.0 - Every site suddenly redirecting root request to forms authentication

    - by Pittsburgh DBA
    Suddenly, IIS 7.0 is redirecting every request for the root of any domain hosted on the box to ~/Account/Logon, which is our Forms Authentication redirect. Additionally, some JavaScript and image requests are being similarly redirected, but not other aspx pages. This is not desirable. Nobody will admit to changing anything. Any ideas? EDIT: It turns out that something has gone wrong with the disk permissions. Can anyone point me to the way things are supposed to be in Windows Server 2008 for a standard ASP.Net installation? The disk permissions are out of whack now.

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  • Distributing WPF apps to a legacy user base: How seamless is it?

    - by Christian Nunciato
    I'm considering developing a WPF application, to be hosted by a legacy Windows app (C++), and I'm trying to get a better sense of how feasible it'll be to do so, given the broad user base I'm targeting. Knowing WPF targets .NET 3.5, I'm looking for some insight as to what the field looks like right now -- who's already got the runtime, whether it's distributed by Windows Update, if so, how (e.g., as an optional or required download, to which operating systems, etc.), whether XP pre-XP2 supports it (and how), and so on. The current version's got many thousands of users, using all manner of Windows operating systems, and while I'd very much like to leverage WPF to breathe some life into their user experience, I want to make sure I'm not shutting anyone out by doing so, or burdening them with a download they might have to do manually. I realize most, or all, of this information's out there already, in various places, but I figured I'd ask here first, since I'm sure some of you've probably already gone down this road and have valuable experiences to share. Thanks in advance!

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  • Setup program needs framework 4.0 - But it's already installed

    - by Willem
    Hi all, I created a service which I now want to install to test. When running the setup program it prompts me to download and install .net fw 4.0, but I already have it installed. I did try to just install the file that I get pointed to (4.0 cliet), but not only does it still not work, it causes vs2010 to throw an unknown error and can't open. I've now uninstalled everything and started afresh with VS2010, framework 4.0 and win 7 but it still prompts me to install fw 4.0 when I try to run the setup. Can anyone please point me in the right direction? Thanx in advance Willem

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  • Clone DB table row through MVC in SQL Server

    - by sslepian
    Is there a simple solution for duplicating table rows in SQL Server as well as all table rows with foreign keys pointing to the cloned table row? I've got a "master" table and a bunch of "child" tables which have a foreign key into the ID of the master table. I need to not only create a perfect copy of the master table, but clone each and every child table referencing the master table. Is there a simpler way to do this than creating a new row in the master table, copying in the information from the row to be cloned, then going through each child table and doing the same with each row pointing to the cloned row in the master table? I'm using a SQL Server 2005 Database accessed through C# ASP.net MVC 1.0.

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  • Nerd Dinner - labels for textfields are broken

    - by AspNewbie
    Hello. I am trying to learn ASP.NET (since I know C#) so I have decided to follow Nerd Dinner Tutorial. I am having trouble in part 5 of tutorial. I exactly followed tutorial, even pasted whole code to my visual studio, but when I was supposed to create EDIT VIEW, my result was different than one in tutorial. Please take a look at following pictures and think, where might problem be. I did not customise anything, everything is default. Please look at the images below (I cant upload them here directly or post more than one hyperlink,system says I need to have reputation points) shttp://i49.tinypic.com/wweooi.png shttp://i46.tinypic.com/21oaufd.jpg NOTE : Please remove "S" letter before HTTP, or I hope there will be kind moderator to do so and remove my NOTE

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  • visusal studio embedded crystal report keeps prompting database login?

    - by phill
    I'm using visual studio 2005 to develop a form with a combobox passing a value into the parameter of an embedded crystal report. I'm trying to figure out why it keeps prompting me for a database login every single time you try to run the report with a different combobox selection. Here is my code: private Sub Form1_load... Dim ConnName As String Dim ServerName As String Dim DBName As String Dim user As String Dim pass As String Dim gDBA As ADODB.Connection Dim records As ADODB.Recordset Dim datver As ADODB.Recordset Dim query As String '---OPEN THE DATABASE CONNECTIONS gDBA = New ADODB.Connection ': gDBA.CursorLocation = adUseServer 'Added to prevent time out error gDBA.CommandTimeout = 1000 : gDBA.ConnectionTimeout = 1000 gDBA.ConnectionString = "Server=svr13;Database=subscribers;User ID=KViews;Password=Solution;Trusted_Connection=True;" gDBA.Open("Data Source=Kaseya;Initial Catalog=subscribers;User Id=KViews;Password=Solution;", "KViews", "Solution") records = New ADODB.Recordset query = "select distinct groupname from _v_k order by groupname desc" 'records.ActiveConnection = gDBA.ConnectionString records.CursorType = CursorTypeEnum.adOpenForwardOnly records.LockType = LockTypeEnum.adLockReadOnly records.Open(query, gDBA) Do While Not records.EOF ComboBox1.Items.Add(records.Fields("groupname").Value) records.MoveNext() Loop end Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim selected As String selected = ComboBox1.Text Dim cryRpt As New ReportDocument cryRpt.Load("C:\Visual Studio 2005\Projects\WindowsApplication1\WindowsApplication1\CrystalReport1.rpt") cryRpt.SetDatabaseLogon("KViews", "Solutions", "svr13", "subscribers") cryRpt.SetParameterValue("companyname", selected) CrystalReportViewer1.ReportSource = cryRpt CrystalReportViewer1.Refresh() End Sub I looked at this previous posting http://stackoverflow.com/questions/1132314/database-login-prompt-with-crystal-reports but this wasn't very helpful. I couldn't find where a CMC was to disable the prompt. Any ideas? thanks in advance

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  • Shall this Regex do what I expect from it, that is, matching against "A1:B10,C3,D4:E1000"?

    - by Will Marcouiller
    I'm currently writing a library where I wish to allow the user to be able to specify spreadsheet cell(s) under four possible alternatives: A single cell: "A1"; Multiple contiguous cells: "A1:B10" Multiple separate cells: "A1,B6,I60,AA2" A mix of 2 and 3: "B2:B12,C13:C18,D4,E11000" Then, to validate whether the input respects these formats, I intended to use a regular expression to match against. I have consulted this article on Wikipedia: Regular Expression (Wikipedia) And I also found this related SO question: regex matching alpha character followed by 4 alphanumerics. Based on the information provided within the above-linked articles, I would try with this Regex: Default Readonly Property Cells(ByVal cellsAddresses As String) As ReadOnlyDictionary(Of String, ICell) Get Dim validAddresses As Regex = New Regex("A-Za-z0-9:,A-Za-z0-9") If (Not validAddresses.IsMatch(cellsAddresses)) then _ Throw New FormatException("cellsAddresses") // Proceed with getting the cells from the Interop here... End Get End Property Questions 1. Is my regular expression correct? If not, please help me understand what expression I could use. 2. What exception is more likely to be the more meaningful between a FormatException and an InvalidExpressionException? I hesitate here, since it is related to the format under which the property expect the cells to be input, aside, I'm using an (regular) expression to match against. Thank you kindly for your help and support! =)

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  • How to call c# server side method through javascript

    - by Nimesh
    Hi, I need to call a c# server method through the javascript. I have a gridview in which i have a column with dropdown list. When i change the dropdown's value i need to call a server side method through javascript and change the value of another text box in the gridview. I am able to do this on the selected index change. but i am slightly worried about the performance. i am using asp.net c#. Please let me know how to do this.

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