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• Can iTextSharp export to JPEG?

  - by SkippyFire

  I need to be able to export PDF's that I am creating to JPEG, so that users can have a screenshot/thumbnail of the end product, which is faster than opening the whole PDF. I am running this on an ASP.NET website running in Medium Trust in the Rackspace Mosso Cloud. I have yet to find a library that will either work in Medium trust, or in the case of ABC PDF, which works great locally, wont load in Mosso. Maybe Mosso has a custom trust level? I know that iTextSharp works on Mosso, but I haven't been able to figure how to "screenshot" a single page of a PDF, or export a page to JPEG. Is there anyone out there who has done this before?

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• Asynchronous operations performance

  - by LicenseQ

  One of the features of asynchronous programming in .NET is saving threads during long running operation execution. The FileStream class can be setup to allow asynchronous operations, that allows running (e.g.) a copy operation without virtually using any threads. To my surprise, I found that running asynchronous stream copy performs not only slower, but also uses more processing power than synchronous stream copy equivalent. Is there any benchmark tests were done to compare a synchronous vs asynchronous operation execution (file, network, etc.)? Does it really make sense to perform an asynchronous operation instead of spanning separate thread and perform synchronous operation in server environment if the asynchronous operation is times slower than the synchronous one?

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• How to serialize and unserialize to/from a C# class?

  - by Earlz

  Hello, I have an object in Javascript that looks like this function MyObject(){ this.name=""; this.id=0; this..... } I then stringify an array of those objects and send it to an ASP.Net web service. Now what I want to do is do some processing on the JSON objects given to the webservice and return a JSON array of the same type of objects(same field names and such) How would I do this easily? I am using Netwonsoft.Json. Is there some way to turn a JSON string into a List or Array of an object?

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• safely lock a file then move? windows

  - by acidzombie24

  I have a file and need to ensure it exist before inserting a row into the db. After i insert i need to use the PK as part of the filename and move it into another location. How do i check if it exist then lock it so it cant be deleted until i can insert into the db then proceed to move the file without it being deleted upon releasing the lock? also the file may be in use. I am thinking of copying the file into a safe location then moving that file away. In this case i need to copy a file that is being used for reading. How can i do the above steps safely? Using .NET

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• Why does a ModalPopupExtender fail when using SSL?

  - by Brooke Jackson

  I have created a modal popup using the ModalPopupExtender in Microsoft's AJAX 1.0 for .NET 2.0. It works great when the page doesn't isn't being accessed through SSL (http://) however the link to close the popup fails to fire if accessing the page through https://. Is the ModalPopupExtender at blame? Is it a "Feature" of SSL to block popups, or is it something else I haven't though of? Here is the code I am using: <asp:Button ID="btnHelp" runat="server" Text="?" CausesValidation="False" /> <asp:Panel ID="pnlHelp" BackColor="white" runat="server"> <asp:LinkButton ID="lnkClosePanel" runat="server" CausesValidation="False" OnClick="lnkCloseHelp_Click">Close</asp:LinkButton> <p>Some Text</p> </asp:Panel> <cc1:ModalPopupExtender ID="popExt" runat="server" TargetControlID="btnHelp" PopupControlID="pnlHelp"></cc1:ModalPopupExtender>

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• StringLengthValidator - localization not working

  - by danysdragons

  I am validating input to my ASP.NET application using StringLengthValidators, and using the ValidationSummary control to display the error messages. To localize the application, the StringLengthValidators have the MessageTemplateResourceName and MessageTemplateResourceType attributes set. The first time the validator runs, it picks up the correct error message based on the current culture setting. If I change the language setting while running the app, the next time the validator runs, the ValidationSummary it still displays the error message for the old culture. The text for all other controls is being updated correctly. Any ideas, folks?

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• RedirectFromLogin in Silverlight Login Page

  - by Oliver

  I am busy writing a login page in Silverlight. I am using an Authentication Service that processes the logins and I am also creating a custom Membership and Roles providers. Everything is working but I need some assistance. I would like some advice on how to redirect the user to page they came from before they were pushed to the Login page. Basically I want the same behavior as the standard ASP.Net login. I am fully aware of the differences between ASP and Silverlight regarding Client and Server side models. I can do the navigation but I always lose the session and cookie when I perform HtmlPage.Window.Navigate() to the ReturnUrl...

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• How can I listen to multiple Serial Ports asynchronously in C#

  - by Kamiel Wanrooij

  I have an application that listens to a piece of hardware on a USB to Serial converter. My application should monitor more than one serial port at the same time. I loop the serial ports I need to listen to, and create a thread for each port. In the thread I have my data handing routine. When I assign one port, it runs flawlessly. When I listen to the other one, it also works. When I open both ports however, the second port always throws an UnauthorizedAccessException when calling serialPort.Open(). It does not matter in what order I open the ports, the second one always fails. I listen to the ports using serialPort.ReadLine() in a while loop. Can .NET open more than one port at the same time? Can I listen to both? Or should I use another (thread safe?) way to access my serial port events?

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• DataContractJsonSerializer produces list of hashes instead of hash

  - by Jacques

  I would expect a Dictionary object of the form: Dictionary<string,string> dict = new Dictionary<string,string>() {["blah", "bob"], ["blahagain", "bob"]}; to serialize into JSON in the form of: { "blah": "bob", "blahagain": "bob" } NOT [ { "key": "blah", "value": "bob" }, { "key": "blahagain", "value": "bob"}] What is the reason for what appears to be a monstrosity of a generic attempt at serializing collections? The DataContractJsonSerializer uses the ISerializable interface to produce this thing. It seems to me as though somebody has taken the XML output from ISerializable and mangled this thing out of it. Is there a way to override the default serialization used by .Net here? Could I just derive from Dictionary and override the Serialization methods? Posting to hear of any caveats or suggestions people might have.

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• Populate data Crystal Report from a query

  - by Selom

  hi big bro and sis, Im having a problem with how to display data using crystal report programmatically and need your help. Im using vb.net for my project. I have a form that I called reportFrm on which I put the CrystalReportViewer1. I also added the CrystalReport1.rpt to my project and the CrystalReport1.rpt contains a textbox called firstname. i would like that when the reportFrm loads, it makes the following query and to fetch the firstname and put it in the textbox firstname: query: Dim cmd As New SQLiteCommand("SELECT * FROM personal_details JOIN studies USING staff_ID WHERE staff_ID = '" + detailsFrm.Label13.Text + "'", conn) my problem is that Im fetching data from two different tables and I don't how to do this. Thanks for helping

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• PropertyGrid: Merging multiple dynamic properties when editing multiple objects

  - by Andrei Stanescu

  Hi, Let's say I have a class A and a class B. I would like to edit using .NET PropertyGrid multiple instances of A and B simultaneously. The desired behavior would be to have the intersection of properties displayed. If A and B have static (written in the source code) properties everything works fine. Selecting A and B instances will only display the intersection of properties. However, if A and B also have dynamic properties (returned as a PropertyDescriptorCollection through the GetProperties() method) the behavior is wrong. When selecting multiple objects I will only see those static properties and none of the dynamic ones. When I select only one instance I can see all properties (static and dynamic). Anybody any ideas? I couldn't find anything on the internet.

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• How can I create a hybrid Silverlight and aspx application

  - by PilotBob

  Here is my scenerio.. We have an ASP.Net 2.x web site. We want to migrate it to Silverlight full frame application. However, there is no way we can go away in a corner and redo every web page in SL right off the bat. What I would like to do is build the chrome of the app (main page, dashboard, login, common system/config screens, main menu) in SL and be able to open existing .aspx pages in the main content SL frame. From what I see there is no way to do this. I thought the Webbrowser control in SL4 would be the answer, but apparently that only works if your app is run out of browser. So, what is my best recourse? It seems like I will have to create some type of .aspx page that hosts the .XAP and pass in the page I want it to load? How would you gurus approach this?

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• Exception handling policy in libraries

  - by Asaf R

  When building a .NET library, what's your exception handling policy? In specific, what's your policy about handling exceptions inside library calls and exposing them to calling code? Would you treat a library function as any other, thus letting all exceptions it can't handle flow out of it as-is? Would you create a custom exception for that library? Would you catch all exceptions and throw the library's exception instead? Would you set the original exception as the library's exception internal exception? How would the library dependence on a DB affect your exception-handling policy? What other guidelines and rules would you suggest?

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• MVC2 ValidationSummary and Client side Validation

  - by Raj Aththanayake

  Hi I want to have the ValidationSummary errors displayed during Client Side validation. Currently the validation messages are only appears next to the field during client side validation. I use…. MicrosoftAjax.js MicrosoftMvcAjax.js MicrosoftMvcValidation.js as my client side libraries. There is a solution for jQuery Validation Library which is in the thread… http://stackoverflow.com/questions/1724790/asp-net-mvc-validationsummary-for-client-side-validation Is there an easy way to do this? I used had xVal working DataAnnotation and it was very easy enable client side validation for the validation summary. E.g <%= Html.ClientSideValidation().UseValidationSummary("validationSummary", “Validation Errors”)% Is there way to do this in MVC2 using MicrosoftAjax?

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• SVN post-commit hook doesn't open up GUI

  - by Oded

  Hi, I've created a form application in .NET which will be used in the post-commit hook. the problem is that the UI of the application is not shown. What may be the problem? Thanks. EDIT my UI should show Issue numbers of the developer. from there he should choose the Issue number that will be inserted to the log message. I've completed the script. But the UI is not shown.

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• Winforms fixed single border on custom shaped control

  - by JD

  Hi all, I have created a custom control inheriting from a panel in .NET 3.5 The panel has a custom polygon border, which comes from a pointF array (In diagram, control is highlighted yellow). Fig 1 shows the control with BorderStyle none. Fig 2 with BorderStyle fixed-single As shown in Fig 2, the border follows the Rectangle bounding the control. IS there a way to make the border follow the actual border of the control set by the polygon? FYI the polygon is created using a GraphicsPath object. Drawing the line with GDI+ does not work, as the control clips the line and it looks awful... Fig1 Fig2

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• How to Test a Multi-Tenant App with support for multiple domains

  - by asifch

  HI, we are building a multi-tenant application, which will support that each tenant can have a unique top level domain, the application is build using the asp.net 3.5 and SQL servr 2005, while each tenant will have different database. I have seen a number of questions about the similar applications on the StackOverFlow, but none of them is related to the Testing, I want to know is how one can test the application in a development environment, specially How can we test that each customer connects to his own DB based on the URL. how can we emulate different domains on the local system. like abc.com and xyz.com all goes to dev machine's IIS. Any recommendations which might help us in the developing process of such an application.

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• Using URL Routing for Web Forms with .ashx files

  - by RandomBen

  I am developing a .NET 3.5 Web Forms based website that uses URL Routing. So far I have created a few routes and I have had no issue. I now have a .ashx file that is going to handle sending .pdf files from a table in SQL Server to the website when someone clicks on a link. Normally when I create a Handler it would look like this: return BuildManager.CreateInstanceFromVirtualPath("~/ViewItem.aspx", typeof(Page)) as Page; For my .ashx file I tried: return BuildManager.CreateInstanceFromVirtualPath("~/FileServer.ashx", typeof(Page)) as Page; This doesn't work though because fileserver.ashx is not a page so casting it as typeof(Page)) as Page is going to fail. What do I cast the VirtualPath as instead of Page or is there some other way I should be doing this.

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• Exception.Data population bug?

  - by Christopher

  Okay, .NET geniuses, here's the relevant part of my code: adapter.Fill(table); return; } catch(Exception ex) { SqlException sqlEx = ex as SqlException; I have an exception that's being thrown by adapter.Fill(), and when I put a breakpoint on the first line in the exception handler, the Exception.Data property already contains a key that is unique to my application. The thing is that it does not happen every time, but only when this exception is thrown within ~2 seconds of it last being thrown. Explain that!! :) Thanks!

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• Injecting tenant repositories with StructureMap in a multi-tenant MVC applicaiton

  - by FreshCode

  I'm implementing StructureMap in a multi-tenant ASP.NET MVC application to inject instances of my tenant repositories that retrieve data based on an ITenantContext interface. The Tenant in question is determined from RouteData in a base controller's OnActionExecuting. How do I tell StructureMap to construct TenantContext(tenantID); where tenantID is derived from my RouteData or some base controller property? Base Controller Given the following route: {tenant}/{controller}/{action}/{id} My base controller retrieves and stores the correct Tenant based on the {tenant} URL parameter. Using Tenant, a repository with an ITenantContext can be constructed to retrieve only data that is relevant to that tenant. Based on the other DI questions, could AbstractFactory be a solution?

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• Export ASPNETDB data to another Database.

  - by raziiq

  Hi there. I am developing in Visual Web developer 2008. I have SQLEXPRESS 2005 and SQL Management Studio 2008 installed on my PC. I purchased a Database MS SQL 2008 on DiscountASP.net. Since the host provides only 1 database and my project has 2 database. One is the ASPNETDB that contains the roles and user etc (created using the Website Configuration Wizard) and the other is my database containing data to my website and is named MainDB. As Host allows only 1 database so i exported my ASPNETDB's tables and stored procedures to my MainDB using aspnet_regsql.exe, but the problem is that stored procedures and tables are exported to my MainDB but data is not exported, i mean there are no users in the tables. My Question is how to export everything of ASPNETDB including stored procedures, tables and data to my MainDB??

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• how to call asp page from html page

  - by amol kadam

  hello sir, I'm Amol Kadam, totally new for asp.net & html . Sir I got the problem while uploading the pages of html & asp. Sir actually i have one html page name as index.html & other one is asp page name as ContactUsNew.aspx. Sir there is link in html page for contact Us page. & for this link i use the code. <td style="height: 42px"> <p class="menu01"><a href="ContactUsNew.aspx">CONTACT US</a></p> </td> Sir when I run this application in localhost it run successfully, but when I upload these pages on ftp that time the path specified for contact us link on index.html page not switches to contactusnew.aspx page. there is path error occured plz help me......

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• False Duplicate Key Error in Entity Framework Application

  - by ProfK

  I have an ASP.NET application using an entity framework model. In an import routine, with the code below, I get a "Cannot insert duplicate key" exception for AccountNum on the SaveChanges call, but when execution stops for the exception, I can query the database for the apparently duplicated field, and no prior record exists. using (var ents = new PvmmsEntities()) { foreach (DataRow row in importedResources.Rows) { var empCode = row["EmployeeCode"].ToString(); try { var resource = ents.ActivationResources.FirstOrDefault(rs => rs.EmployeeCode == empCode); if (resource == null) { resource = new ActivationResources(); resource.EmployeeCode = empCode; ents.AddToActivationResources(resource); } resource.AccountNum = row["AccountNum"].ToString(); ents.SaveChanges(true); } catch(Exception ex) { } } }

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• jquery select item in radiobuttonlist via client-side function

  - by mcliedtk

  I have the following ASP.NET RadioButtonList: <asp:RadioButtonList ID="rbl" runat="server"> <asp:ListItem Text="Type1" Value="1" /> <asp:ListItem Text="Type2" Value="2" /> </asp:RadioButtonList> I would like to select an item in the list programmatically via a client-side jquery function like this (simplified version): function BindWidget(widget) { // Type property of Widget is an int. $("#<%=rbl.ClientID%>").selectItemByValue(widget.Type); } Ideally, there is some function - in the above code I have proposed selectItemByValue - that selects an item in a RadioButtonList by a given value. Does jquery have a similar function built-in? If not, how should I go about implementing the desired functionality?

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• Read cookies in silverlight

  - by Dharam Narayan

  hi, I have an ASP.NET MVC application. In this after user get Sign in .We set the a cookie for the user who logged in using FormsAuthentication.SetAuthCookie(userName, false). In other page we get the Cookies using the FormsAuthentication.GetAuthCookie(userName]) . This cookie values as string is then set in the Response.Cookies["username"].Value = cookiesvalue . We have .aspx page in the same application that downloads silverlight application .Silverlight reads the cookies using the code string[] cookies = HtmlPage.Document.Cookies.Split(';'); The problem is that once session expires in the application,silverlight cannot read the cookie value. After the session expires we again set the cookies in headers using the Response.Cookies["username"].Value = cookiesvalue . But still silverlight application cannot read this cookie . Thanks in Advance DNM

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