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• What are the most likely reasons an application would fail on only one of my servers?

  - by Rising Star

  I have several servers to test new code on. I primarily push out asp.NET web applications. Last week, I had an issue where I installed a newly developed web application on three servers. The three servers all run in separate environments. The application worked fine on two of them, but consistently crashed on the third server with each web request. The problem was eventually traced to an in-house developed .dll file being out of date on the third server. I'm certain that this kind of thing happens all the time. However, there are numerous things that could go wrong to cause this kind of behavior. I spent quite a bit of time tracing this problem. I would like to make a list of things to be suspicious of next time this happens? What are the most likely reasons that a web application would crash on one of my servers while identical code runs fine on another server.

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• Page inheritance in mixed asp.net Forms and MVC application

  - by Rising Star

  I'm working on a web application. One of my co-workers has written some asp.net forms pages. The page classes all inherit from BasePageClass, which of course inherits from the Page class. I wish to add some MVC controllers that I've been told need to use the same logic implemented in the BasePageClass. Ordinarily, I would want to inherit the functions in the BasePageClass in the controller classes, but this breaks the inheritance heirarchy. What is the best practice for solving this problem?

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• What does @ preceeding a string literal mean in C#?

  - by Rising Star

  In C#, what is the difference between string foo = @"foo string"; and string foo = "foo string"; ?

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• Can i change the identity of the logged in user in ASP.net?

  - by Rising Star

  I have an ASP.net application I'm developing authentication for. I am using an existing cookie-based log on system to log users in to the system. The application runs as an anonymous account and then checks the cookie when the user wants to do something restricted. This is working fine. However, there is one caveat: I've been told that for each page that connects to our SQL server, I need to make it so that the user connects using an Active Directory account. because the system I'm using is cookie based, the user isn't logged in to Active Directory. Therefore, I use impersonation to connect to the server as a specific account. However, the powers that be here don't like impersonation; they say that it clutters up the code. I agree, but I've found no way around this. It seems that the only way that a user can be logged in to an ASP.net application is by either connecting with Internet Explorer from a machine where the user is logged in with their Active Directory account or by typing an Active Directory username and password. Neither of these two are workable in my application. I think it would be nice if I could make it so that when a user logs in and receives the cookie (which actually comes from a separate log on application, by the way), there could be some code run which tells the application to perform all network operations as the user's Active Directory account, just as if they had typed an Active Directory username and password. It seems like this ought to be possible somehow, but the solution evades me. How can I make this work?

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• How do I access a DIV from javascript when using a master page?

  - by Rising Star

  I have a web page that contains a "div" element. On the page, there is javascript to reference the div: document.getElementById('divId'). This was working fine until another developer redesigned the page to use an ASP master page. Now, document.getElementById('divId') returns null. It appears that ASP.net prepends some characters to the names of elements within contents forms when you use a master page. How can I know what the id of the div is when the page loads? Update Allow me to give a specific example to clarify the question: My page had a div with ID divNotice. After changing my page to use a master page, I see when I print the source to the page that renders that the div ID is ctl00_ContentPlaceHolder1_divNotice. My question is, how am I supposed to know what the div ID is going to be when the framework is done with it?

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• What is a good practice for handling SQL connections within a WCF call?

  - by Rising Star

  Suppose I want to create a (stateless) WCF service with three methods exposed on an endpoint: performSqlOperationA(), performSqlOperationB(), and performSqlOperationC(). Each method inserts data into a SQL database. The way I've seen things done at my office, each method would begin with code to initialize a SqlConnection object. Each method would end with code to safely dispose it. What is a good practice for coding these WCF methods so that the SqlConnection object is initialized and disposed in each method without having to do these things in each method? I know that I can have the connection initialized in the constructor for the class for the WCF methods, but I don't know about disposing it... The calls cannot be wrapped in a using block. One solution I'm familiar with is PostSharp, which allows me to set an attribute which causes specific code to automatically run at the beginning and end of each method call, but it would be greatly preferable to do this with only the .net framework.

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• What is a good way of checking to see if a particular user may access a particular file?

  - by Rising Star

  I am working on application which runs as a special unprivileged user. I would like to be able to easily check to see if the user can read a given file. It seems like this should be easy, even when I go into the file in Windows Explorer and see that the read permission is checked, it sometimes seems that there is still something preventing the user from reading the file (such as a parent directory that the user cannot browse) when I try to read it as the user programmatically. The user has no console logon permission, so I can't just log in as the user and try to read the file. So... If I want to know, "Does UserBob have access to file c:\specialPath\specialFile, what is an easy way to find out? BTW, my environment is Windows Server 2003.

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• Claims-based Authentication: Are strings the essence of claims?

  - by Rising Star

  I've been programming with claims-based authentication for some time now with Windows Identity Foundation. It appears to me that in Windows Identity Foundation, once a user is logged in, the claims are basically strings of information that describe the user. With the old role-based authentication, I could say that a user is or is not a member of a given group, but with claims-based authentication, I can now have strings of information that describe a user. "This user is female". This user was born on "July 6, 1975". "This user logged in using a USB key". Is it the essence of claims-based authentication,that I have strings of information about the user given to the application by the framework?

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• How does IIS persist a user's identity from page to page?

  - by Rising Star

  Web pages are, by nature, state-less objects. When you click from page to page in an ASP.net application, each request for a page is treated as a brand-new request. We use things like cookies, session-variables, and query strings to maintain state from page to page. When you log in to an ASP.net web application using Windows Authentication, how does IIS persist your identity between pages?

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• How do I access a DIV from javascript, if ASP.NET mangles its ID?

  - by Rising Star

  I have a web page that contains a "div" element. On the page, there is javascript to reference the div: document.getElementById('divId'). This was working fine until another developer redesigned the page to use an ASP master page. Now, document.getElementById('divId') returns null. It appears that ASP.net prepends some characters to the names of elements within contents forms when you use a master page. How can I know what the id of the div is when the page loads? Update Allow me to give a specific example to clarify the question: My page had a div with ID divNotice. After changing my page to use a master page, I see when I print the source to the page that renders that the div ID is ctl00_ContentPlaceHolder1_divNotice. My question is, how am I supposed to know what the div ID is going to be when the framework is done with it?

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• How does lock(syncRoot) make sense on a static method?

  - by Rising Star

  The following code is excerpted from the (Windows Identity Foundation SDK) template that MS uses to create a new Security Token Service Web Site. public static CustomSecurityTokenServiceConfiguration Current { get { HttpApplicationState httpAppState = HttpContext.Current.Application; CustomSecurityTokenServiceConfiguration customConfiguration = httpAppState.Get( CustomSecurityTokenServiceConfigurationKey ) as CustomSecurityTokenServiceConfiguration; if ( customConfiguration == null ) { lock ( syncRoot ) { customConfiguration = httpAppState.Get( CustomSecurityTokenServiceConfigurationKey ) as CustomSecurityTokenServiceConfiguration; if ( customConfiguration == null ) { customConfiguration = new CustomSecurityTokenServiceConfiguration(); httpAppState.Add( CustomSecurityTokenServiceConfigurationKey, customConfiguration ); } } } return customConfiguration; } } I'm relatively new to multi-threaded programming. I assume that the reason for the lock statement is to make this code thread-safe in the event that two web requests arrive at the web site at the same time. However, I would have thought that using lock (syncRoot) would not make sense because syncRoot refers to the current instance that this method is operating on... but this is a static method? How does this make sense?

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• asp.net impersonation identity: Where does it come from?

  - by Rising Star

  Here's a simple question I've been stuck on for a while. When I set < identity impersonate=true > in my web.config so that asp.net impersonates the logged on user automatically (or the anonymous account if not using Windows Authentication), where does the identity that asp.net impersonates come from? This document: http://msdn.microsoft.com/en-us/library/ff649264.aspx shows three places you can retrieve information about the logged on user: Httpcontext.Current.user System.Threading.Thread.Current System.Security.Principal.WindowsIdentity.GetCurrent It seems that none of these locations consistently match the identity that gets impersonated when I set < identity impersonate=true > in web.config. I would like to know where the impersonated identity comes from.

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• Is there a tool that will show diagrams of my SQL database in real-time?

  - by Rising Star

  I've created some diagrams of SQL tables using the "Reverse Engineer" feature of Microsoft Office Visio. I like being able to visualize my relational databases in this manner. However, what I get is just a static document that I can print, e-mail to colleagues, and click widgets on. Earlier this year, I saw at a demo that the new version of Visual Studio 2010 has a new feature called the "Architect Explorer", which allows developers to view relationships among .net classes on the fly. It has many features for filtering the data that the developer is interested in. It would be really awesome if I could visually browse my tables and stored procedures and see what is related to what by primary key, foreign key, and referenced in stored procedures. I realize that I'm talking about two entirely different technologies and it's not a perfect analogy, but is there some similar tool that would allow me to visualize tables in my SQL database?

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• Under what circumstances does it make sense to run a WCF client and server on the same machine?

  - by Rising Star

  In Learning WCF, by Michele Bustamante, there is a section that describes a binding called the NetNamedPipes binding. The books says that this binding can only be used for WCF services that will be called exclusively from the same machine. Under what circumstances would it make sense to use this? Ordinarily, I would write asynchronous code without using WCF... Why would Microsoft provide something for WCF that can only run on the same machine?

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• How can I save/print values in my WATCH list in Visual Studio 2008?

  - by Rising Star

  When I attach the Visual Studio 2008 debugger to my web server process, I sometimes browse a large amount of data in my watch list. Suppose I have an array of string variable that I expand to show 20 entries. It seems that the only way to save these values is to copy and paste them one at a time. I have gone so far as to do a screen-shot in order to have a record of what the values were (to refer to later or print a hard copy). Is there an easy way to save and print these values? I am familiar with the new "IntelliTrace" feature in Visual Studio 2010 Ultimate, but it seems overkill for this purpose. I just want to take something like an array of strings and save it for later reference once I've stopped the debugger. What's a good way to do this?

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• How do I unhide Debug -> Attach to Process in Visual Studio 2008?

  - by Rising Star

  I'm using Visual Studio 2008 Professional at work. Recently, I got a new workstation. Someone else installed all the software for me. For some reason, I do not see the option "Attach to Process" on the debug menu. I looked in the options, but I don't see an option that seems like it should hide it. How do I make the option "Attach to Process" appear on the debug menu?

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• What is the difference between `Synclock syncroot` and `SyncLock Me`?

  - by Rising Star

  vb.Net multithreading question: What is the difference between SyncLock syncRoot ''# Do Stuff End SyncLock -and- SyncLock Me ''# Do Stuff End SyncLock

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• Can I use a attribute to make .net impersonate another user?

  - by Rising Star

  I am familiar with impersonating an account in .net by using: dim myIdentity as WindowsIdentity = someIdentity using ctx as WindowsImpersonationContext = myIdentity.Impersonate() doStuff() end using Is it possible to define a .net attribute so that I could write something like: < runAsUser(someIdentity) public sub doStuff() and then have the .net framework always impersonate when running the method doStuff()?

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• Why does Visual Studio 2008 try to open a project from the wrong folder?

  - by Rising Star

  I'm having a bizarre problem with Visual Studio 2008. I wanted to debug one of the libraries that my web application references. Therefore, I decide to add the project containing the library to my solution so that I can debug them together. The project containing my library sits at c:\webLibs\myproj.vbproj. However, when I try to add the project to my solution, Visual Studio throws the following error: "The project file 'c:\someOtherFolder\myproj.vbproj'. has been moved, renamed, or is not on your computer." As you can see, VS appears to be trying to open a different file than the one I clicked on. I used to have the file in that other location, but not anymore. I've tried restarting VS several times. What could cause this bizarre behavior? Why would Visual Studio try to open my project from the wrong folder?

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• What is the best way to programmatically run javascript when an ASP.net page loads?

  - by Rising Star

  In my global.asax file for my ASP.net project, I am checking for certain conditions. When those conditions are met, I want to automatically execute javascript code when the page runs. This is my code: if condition Then Response.Write("") Response.Write(" // Javascript code to do stuff ") Response.Write("") End If While this appears to work to execute the Javascript code, I don't think it's a best practice because this code will preceed all of the HTML of the page that gets loaded. What is the best way of programmatically tacking on some extra Javascript code to be run when my page loads?

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• Winamp question: Generating 'dynamic playlists' from file playlists -OR- mass-tagging by file playli

  - by Daddy Warbox

  I'm trying to think of a way to do this. I sort my songs into a variety of playlists corresponding to different 'moods' I might have as I listen to them, and some songs fit for more than one kind of mood (e.g. a jazz song might be 'stylish' and 'emotional', or something to that effect). I also give them star ratings for a general sort of opinion about them. I want to be able to filter and sort my media library by the moods I want or don't want, as well as by star rating. Anyone have a good way to do something like this? I can't seem to use Winamp's dynamic playlists to generate lists from existing filesystem playlists (e.g. songs in a given .m3u files). Hand-tagging files with Winamp's tag editor is a royal pain. It's trouble enough just giving a star rating and sorting into playlists as is. If there is there a way to mass tag songs within each playlist with mood words to allow me to create dynamic playlists, I'd be fine (for now). It'd be nice if I could do this via some kind of hotkey for each song, too. I'm looking to see if I can use a macro program or something to do that, though. Thanks in advance. P.S: Alternatively, would something like Foobar have functions like this? Note: Italics are recent edits.

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• Is there a free XML viewer to do "pivot tables"

  - by FumbleFingers

  I have an *.xml file on a PC running Windows XP, with a structure something like... <movies id="my movies" <movie name="Unforgiven" <people star="Clint Eastwood" director="Clint Eastwood"/> </movie> <movie name="A Fistful of Dollars" <people star="Clint Eastwood" director="Sergio Leone"/> </movie> <movie name="J Edgar" <people star="Leonardo DiCaprio" director="Clint Eastwood"/> </movie> </movies> I want to open this file in a viewer utility which will show one line per movie, filtered by a condition such as director="Clint Eastwood", including the relevant value for movie name on each line. Note - that's just an example. My actual file has thousands of lines, each possibly several hundred bytes long, and there are many more levels and named values. The important thing is I want to apply a filter for a specified value of some field at some level. And I want to see one line for every case where that value occurs, showing the values for any fields I specify, even if they're stored at higher levels. I may be mistaken in saying what I want is a "pivot table" - I don't know what I should call it.

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• Underlying Concept Behind Keyboard Mappings

  - by ajay

  I am frustrated with key mapping issues. On my Linux box, if I type Home/End in Vim, then the cursor actually moves to the beginning/end of the line. On my Mac when I am on TextEdit, if I do Fn + Left or Fn + Right, it takes me to beginning/end of the line. But if I am on Vim on my Mac terminal, then the same key combinations don't work. Why? I see online all the different cryptic settings that I have to paste in .vimrc to make this work, but I can't find any explanation for those cryptic map, imap settings. What is the underlying issue here, and how can I fix it? Thanks!

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• What is meant by "no password set" for root account (and otthers)?

  - by MMA

  Several years back, we were more accustomed to changing to the root account using the su command. First, we switched to the root account, and then executed those root commands. Now we are more accustomed to using the sudo command. But we know that the root account is there. We can readily find the home directory of user root. $ ls -ld /root/ drwx------ 18 root root 4096 Oct 22 17:21 /root/ Now my point is, it is stated that "the root password in Ubuntu is left unset". Please see the answers to this question. Most of the answers have something to this effect in the first paragraph. One or two answers further state that "the account is left disabled". Now my (primary) questions are, What is meant by an unset password? Is it blank? Is it null? Or something else more cryptic? How does the account becomes enabled once I set password for it? (sudo password root) In order get a better understanding, I checked the /etc/shadow file. Since I have already set a password for the root account, I can no longer see what is there (encrypted password). So, I created another account and left it disabled. The corresponding entry in the /etc/shadow file is, testpassword:!:16020:0:99999:7::: Now perhaps my above queries need to be changed to, what does an ! in password field mean? Other encrypted passwords are those very long cryptic strings. How come this encrypted form is only one character long? And does an account become disabled if I put an ! in the (encrypted) password field?

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• How to handle search term concatenations in SOLR

  - by Joost Moesker

  We are currently replacing our product search from mysql to a SOLR backend. Our customer often search for terms like 'startrek online', 'starwars', 'redsteel' or even 'grandtheftauto'. Is there a method in SOLR to either expand or spellcheck these searches into syllables eg.'star trek online', 'star wars', 'red steel', 'grand theft auto'?

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