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• Caching result of SELECT statement for reuse in multiple queries

  - by Andrew

  I have a reasonably complex query to extract the Id field of the results I am interested in based on parameters entered by the user. After extracting the relevant Ids I am using the resulting set of Ids several times, in separate queries, to extract the actual output record sets I want (by joining to other tables, using aggregate functions, etc). I would like to avoid running the initial query separately for every set of results I want to return. I imagine my situation is a common pattern so I am interested in what the best approach is. The database is in MS SQL Server and I am using .NET 3.5.

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• Using Html.LabelFor to display human readable label?

  - by Shay Friedman

  I'm using ASP.NET MVC 2 and I'm struggling to understand how can I use the Html.LabelFor helpet method. Assuming I have a model: public class Person { public string FirstName { get; set; } } In my view, if I write: <%: Html.LabelFor(model => model.FirstName) %> What I get on the page is "FirstName". But I don't want that because it's now user-friendly. I want it to be "First Name". How do I achieve that? Thanks.

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• saving dataset in excel and allow user to download it in the client machine.

  - by Jebli

  Hi, I am developing an application where i want i am displaying a dataset in the datagrid view for the user.Now the user wants to download the data in the datagridview in an excel format.How can i do it ? 1) should i write the dataset in the excel and save it the server before the user download the file ? 2) Can i use a hyper link and set the path of the file that is saved in the server to the hyper link hRef property , so that the user can click and download the file ? I am using C# ASP.net 2.0 Please help !

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• Request for the permission of type 'System.Data.SqlClient.SqlClientPermission failed

  - by Richmond

  Hi All! I have asp.net application, using LINQ to connecto to SQL Server 2008 R2 databse. My connection string: Data Source=[SqlServerIp];Initial Catalog=[databaseName]User Id=newLogin;Password=newPassword; When I deploy application on my local IIS (which is not the same machine as database server) it works fine, but when I deploy application on other IIS (the same machine as sqlServer) it throws an exception: System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. Anyone knows how to fix it? Maybe it is due to some bad configuration of IIS? Please help.

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• Interview Questions that can be asked on TCP/IP, UDP, Socket Programming ?

  - by Shantanu Gupta

  I am going for an interview day after tomorrow where i will be asked vaious questions related to TCP/IP and UDP. As of now i have prepared theoritical knowledge about it. But now I am looking up for gaining some practicle knowledge related to how it works in a network. What all is going in vaious .NET classes. I want to create a very small application like a chat or something that can make me all these concepts very much clear. Could you please suggest some questions related to TCP/IP that you generally ask or that you might have faced. How communication is going from server to client. Right now I am studying TcpClient, TcpListener and UdpClient Class but I want to implement all of them so as to get aware about its working. Is Chat application a Tcp/IP application ? I would appreciate your help.

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• Why does Cache.Add return an object that represents the cached item?

  - by Pure.Krome

  From MSDN about the differences between Adding or Inserting an item the ASP.NET Cache: Note: The Add and Insert methods have the same signature, but there are subtle differences between them. First, calling the Add method returns an object that represents the cached item, while calling Insert does not. Second, their behavior is different if you call these methods and add an item to the Cache that is already stored there. The Insert method replaces the item, while the Add method fails. [emphasis mine] The second part is easy. No question about that. But with the first part, why would it want to return an object that represents the cached item? If I'm trying to Add an item to the cache, I already have/know what that item is? I don't get it. What is the reasoning behind this?

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• Extract text and image from a pdf in a selected area or coordinates

  - by yercaudARUN

  Hi All, I have a specific requirement of extracting text and images from a specific area in a pdf file.The area might be a selected or highlighted or from a given set of coordinates. When i went through, all the approaches are to extract images and text entirely from the PDF on not in a specified location. I tried with iTextSharp,Syncfussion,Apose but couldn figure out a better approach for this. If somebody could help me out in this it would be greatfull. Can you share your ideas and suggestion on how to implement this in .net. Regards, Arun.M

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• Is GOTO really as evil as we are led to believe?

  - by RoboShop

  I'm a young programmer, so all my working life I've been told GOTO is evil, don't use it, if you do, your first born son will die. Recently, I've realized that GOTO actually still exists in .NET and I was wondering, is GOTO really as bad as they say, or is it just because everyone says you shouldn't use it, so that's why you don't. I know GOTO can be used badly, but are there any legit situations where you may possibly use it. The only thing I can think of is maybe to use GOTO to break out of a bunch of nested loops. I reckon that might be better then having to "break" out of each of them but because GOTO is supposedly always bad, I would never use it and it would probably never pass a peer review. What are your views? Is GOTO always bad? Can it sometimes be good? Has anyone here actually been gutsy enough to use GOTO for a real life system?

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• How can I set two values in HtmlInput control

  - by Homam

  Hi, I have an HtmlInputText in an EditItemTemplate in a DataGrid, This control is bound with a value from the SqlDataSource I want to set in this control two values the JOB_CODE_ID and the JOB_CODE instead of just JOB_CODE. I used to use Tag in the WinForms to set values such this, but in I don't know similar way in ASP.Net. In my situation I can't use a hidden control to save the JOB_CODE_ID there, Is there any way to set two values in a HtmlInputText control ? The code: <input type="text" ID="JOB_CODETextBox" runat="server" value='<%# Bind("JOB_CODE") %>' /> Thanks in advance.

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• XPath for choosing a sibling after

  - by Arsen Zahray

  I've got following xml: <root> <a>value1</a> <b>value2</b> <c>value3</c> <a>value5</a> <d>value4</d> <b>value2</b> <b>value3</b> <a>value7</a> </root> I want to select the first sibling a after node //b[text()='value2'] if it's not followed by an other b-node (in this case it will be <a>value5</a>, <a>value7</a> should not be selected). What's the xpath to do that? I'm using .net 4 and xpath 1.0

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• Active Index is not being persisted in jQuery accordion change event

  - by Xaisoft

  I have an asp.net aspx page and on that page I have a hidden input field with and id of paneIndex. However, when I load the page, the alert shows index 1 which is correct on the first load, but if I open up pane 3 for example, the alert shows 1 still. Am I doing something wrong? In a Custom.js file, I have the following code: $(document).ready(function() { $("#accordion").accordion({ active: 1, collapsible: true, autoHeight: false, change: function(event, ui) { var activeIndex = $("#accordion").accordion('option', 'active'); $("#paneIndex").val(activeIndex); //alert(activeIndex); } }); }); In my server side button click, I have the following code: string activeIndex = Request.Form["paneIndex"]; string script = string.Format(@"<script type=""text/javascript"">var paneIndex = {0};</script>", activeIndex); if(!ClientScript.IsStartupScriptRegistered("JSScript")) ClientScript.RegisterStartupScript(this.GetType(),"JSScript", script);

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• SQlite/Firebird: Does any of them support multiple concurrent write access ?

  - by Quandary

  Question: I currently store ASP.net application data in XML files. Now the problem is I have asynchronous operations, which means I ran into the problem of simultanous write access on a XML file... Now, I'm considering moving to an embedded database to solve the issue. I'm currently considering SQlite and embeddable Firebird. I'm not sure however if SQlite or Firebird can handle multiple concurrent write access. And I certainly don't want the same problem again. Anybody knows ? SQlite certainly is better known, but which one is better - SQlite or Firebird ? I tend to say Firebird, but I don't really know. No MS-Access or MS-SQL-express recommodations please, I'm a sane person.

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• Session Timeout and page response time

  - by Johnny5

  Hi, I'm load testing an asp.net app. The load test is simulating 500 user doing searchs on the site and browsing the results. I'm observing that the more I reduce the session timeout limit (in web.config) the better the page response time. For exemple, with a timeout at 10 minutes, I got an average response time of 8.35 seconds. With a timout at 3 minutes, the average response time for the same page is 3,98 seconds. The session in stored "InProc". I supposed the memory used by the "no more used but still actives" sessions may be in cause. But, even if there is more memory used when the timeout is at 10, there is still plenty of memory available (about 2.7Gb). Any ideas?

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• which technology is best for a Facebook application Ruby on Rails or C# and ASP?

  - by Johnny

  hi, My friend and I want to write a Facebook application. We've narrowed down the list of possible technologies to Ruby on Rails and C# with ASP. Here are the pros and cons we've thought of. Cons: ASP - proprietary tools like Visual Studio etc. cost (lots of) money. We both don't know ASP (although we're not bad at C#). RoR - It's scripting so might be harder to maintain. My friend doesn't know RoR at all (but he's a fairly proficient programmer so will probably be able to pick it up quickly). Pros: ASP - Facebook has an official SDK for .NET. RoR - I know RoR. It's open source, free and has fast development time. What says the community? Is there something we haven't thought of?

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• Is it possible to query a XML file with SQL?

  - by Monty

  Currently I'm working on a case where we don't want to change to much on a c#/wpf program, but like to add a feature. Currently we allow certain users to add sql queries to a database to retrieve customer data, hereby a custom connection string/ provider name must be specified. With this information it's possible to create the connection and obtain the data with c#. However we like to add the possibility to allow that user group to query XML files too, with a certain connection string/ provider name. I just had a look for possibities in .net to do that, but can't seem to find a decent way... Is something like this possible? (OleDb/ODBC way maybe?) Thanks in advance.

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• How to automatically check out a database file in a source controlled web application ?

  - by TheRHCP

  Hello, I am working on an ASP.NET web application, we are a small team (4 students) and we do not have access to a dedicated server to host the database instance. So for this web application we decided just to put the database file in the App_Data folder. The problem is that our project is source controled on TFS, so every time you open the solution and try to launch the web application, we get an expcetion saying that database is read-only. That is logical because the databse file is not automatically checked-out. Is there a workaround to avoid a manual check-out of the database file everytime we open the solution ? Thanks.

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• Ping or otherwise tell if a device is on the network by MAC in C#

  - by Aric TenEyck

  I'm developing a home security application. One thing I'd like to do is automatically turn it off and on based on whether or not I'm at home. I have a phone with Wifi that automatically connects to my network when I'm home. The phone connects and gets its address via DHCP. While I could configure it to use a static IP, I'd rather not. Is there any kind of 'Ping' or equivalent in C# / .Net that can take the MAC address of a device and tell me whether or not it's currently active on the network?

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• form submits in FireFox when any button on page is clicked

  - by RememberME

  First time using Asp.net-mvc and originally followed the NerdDinner tutorial. My form submit button looks like this: <p> <input type="submit" value="Save" /> </p> I've now added another button to the page with jQuery code attached. It works in IE, but when I test in FireFox the form submits. I tried adding another button, this time with no attached jQuery code and the same thing happens. When the button is clicked, the form submits. <button id="random-button">Do Nothing</button> ??

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• generating resource file (Resource Generator)

  - by syedsaleemss

  I'm new to c# programming.. I'm using windows form application c# .net I have been given a .resources file. it contains 2 columns 1) key and 2) values. I have brought the contents of this file into a datagrid using dynamic table in between and using resource manager. Now i have to edit the value column in the datagrid and if i click on a GENERATE button i should create a new resource file and it has to be stored as a file. In the same way i should create many sucj resource file. please help me.

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• help me to understand viewstate

  - by EquinoX

  I was just reading this article here to understand about how view state and ASP.NET page cycle works. I just don't understand this part here: If this were the case, then in step 3 the Label's Text property would be assigned to "Hello, World!" in the instantiation stage, but would not be reassigned to "Goodbye, Everyone!" in the load view state stage. Therefore, from the end user's perspective, the Label's Text property would be "Goodbye, Everyone!" in step 2, but would seemingly be reset to its original value ("Hello, World!") in step 3, after clicking the Empty Postback button. This paragraph is after the three step 1, step 2, step 3 boxes. Why wouldn't the label's text property be reassigned to "Goodbye, Everyone" in the load view state?

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• question about JSON

  - by Rawhi

  Hi, If I have in my db a table called User with name, Id, age fields and I want to get these data and put it in a var as a JSON serialize, then I want to send it to javascript page to reform it as I want . I need to know how to put these data in a var as a JSON, how to read the data in the javascript file (how to deal with each one. for example : array[name]) !!!? which thing is more better to deal with these data in asp.net code then send it in the javascript or to send it to the javascript and then to deal with !!? thank u :D

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• How to replicate this screenshot in WebForms?

  - by AngryHacker

  I need to replicate the following in ASP.NET WebForms using a GridView. But I am not sure where to start. Basically I need 3 columns. The checkbox (which sometimes needs to be disabled), and 2 standard text columns. I've gone through the tutorial and I can see how to basically dump text data into a GridView, but not clear on how to implement checkboxes, particularly ones that needs to be disabled once in a while. And I have to replicate the style of the screenshot (e.g. border on the bottom). Having trouble with that as well. How do I swing something like that?

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• How do I effectively store a connection string in machine.config only?

  - by Scott Bedwell

  We are moving to an environment with multiple engines of MS SQL running on the same server (a test engine and a production engine). We also have separate test and production web servers, and would like for our asp.net applications to "magically" use the test database engine on the test web server and the production database engine on the production web servers. We would like to store the connection strings in machine.config rather than in web.config, but when we put it in machine.config, visual studio's IDE (particularly with datasets) does not recognize that the machine.config contains the connection. Does anyone know of a solution for displaying these machine.config connection strings in visual studio, or of a different solution that would accommodate for this? Thanks.

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• What's causing “Session state has created a session id, but cannot save it because the response was

  - by mike nelson

  I'm getting this fault intermittently. I found this link which summarises fairly well what I was able to find on the Google: http://www.wacdesigns.com/2009/02/03/session-state-has-created-a-session-id-but-cannot-save-it-because-the-response-was-already-flushed-by-the-application/ Basically it says you can try setting the web config setting DisplayWhenNewSession, or try kicking the session state thing into life by getting the Session.SessionID in the Session_OnStart. But does anyone: a) have an explanation for this or even better, b) have a tried and tested fix I realise that I can't flush the response after doing anything that would affect the http response header. If I did this it would cause an error every time but this is intermittent. The SessionID should surely be created by ASP.NET at the beginning of the page response automatically, before anything in the ASPX page or the Page_Load (which is where all my flushes are called).

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• How can i test my DB speed? (Learning)

  - by acidzombie24

  I have design a database. Theres no columns with indexing, nor any code for optimizing. I am positive i should index certain columns since i search them a lot. My question is HOW do i test if any part of my database will be slow? ATM I am using sqlite and i will be switching to either MS Sql or MySql based on my host provider. Will creating 100,000 records in each table be enough? Or will that always be fast in sqlite and i need to do 1mil? Do i need 10mil before a database will become slow? Also how do i time it? I am using C# so should i use StopWatch or is there a ADO.NET/Sqlite function i should use?

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