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• How to implement IDisposable properly

  - by Vince

  Hi, I've seen so much C# code in my time as a developer that attempt to help the GC along by setting variables to null or calling Dispose() on classes (DataSet for example) within thier own classes Dispose() method that I've been wondering if there's any need to implement it in a managed environment. Is this code a waste of time in its design pattern? class MyClass : IDisposable { #region IDisposable Members public void Dispose() { otherVariable = null; if (dataSet != null) dataSet.Dispose(); } #endregion }

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• open new silverlight window when button click

  - by aharont

  i created a silverlight window and i whant it to appear when i press a button, how can i do it? it does't has a "show" method...

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• In C#, how do I check if a type is a subtype OR the type of an object?

  - by Daniel T.

  To check if a type is a subclass of another type in C#, it's easy: typeof (SubClass).IsSubclassOf(BaseClass); // returns true However, this will fail: typeof (BaseClass).IsSubclassOf(BaseClass); // returns false Is there any way to check whether a type is either a subclass OR of the base class itself, without using an OR operator or using an extension method?

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• True / false evaluation doesn't work as expected in Scheme

  - by ron

  I'm trying to compare two booleans : (if (equal? #f (string->number "123b")) "not a number" "indeed a number") When I run this in the command line of DrRacket I get "not a number" , however , when I put that piece of code in my larger code , the function doesn't return that string ("not a number") , here's the code : (define (testing x y z) (define badInput "ERROR") (if (equal? #f (string->number "123b")) "not a number" "indeed a number") (display x)) And from command line : (testing "123" 1 2) displays : 123 Why ? Furthermore , how can I return a value , whenever I choose ? Here is my "real" problem : I want to do some input check to the input of the user , but the thing is , that I want to return the error message if I need , before the code is executed , because if won't - then I would run the algorithm of my code for some incorrect input : (define (convert originalNumber s_oldBase s_newBase) (define badInput "ERROR") ; Input check - if one of the inputs is not a number then return ERROR (if (equal? #f (string->number originalNumber)) badInput) (if (equal? #f (string->number s_oldBase)) badInput) (if (equal? #f (string->number s_newBase)) badInput) (define oldBase (string->number s_oldBase)) (define newBase (string->number s_newBase)) (define outDecimal (convertIntoDecimal originalNumber oldBase)) (define result "") ; holds the new number (define remainder 0) ; remainder for each iteration (define whole 0) ; the whole number after dividing (define temp 0) (do() ((= outDecimal 0)) ; stop when the decimal value reaches 0 (set! whole (quotient outDecimal newBase)) ; calc the whole number (set! temp (* whole newBase)) (set! remainder (- outDecimal temp)) ; calc the remainder (set! result (appending result remainder)) ; append the result (set! outDecimal (+ whole 0)) ; set outDecimal = whole ) ; end of do (if (> 1 0) (string->number (list->string(reverse (string->list result))))) ) ;end of method This code won't work since it uses another method that I didn't attach to the post (but it's irrelevant to the problem . Please take a look at those three IF-s ... I want to return "ERROR" if the user put some incorrect value , for example (convert "23asb4" "b5" "9") Thanks

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• Selecting multiple cached elements

  - by Globalz

  In jQuery you can select two elements by id like: $('#elem, #elem2'); BUT What if you have cached the elem and elem2, and what to apply the same method/function to them both? i.e. $elem = $('#elem'); $elem2 = $('#elem2'); This obviously wont work: $($elem, $elem2) Thanks!

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• Date and time picker in one view...

  - by Rahul Varma

  Hi guys, I wanted to know whether we can implement both date and time picker in one view... In iphone app you can pick both date and time through one view. But in android we have date picker and time picker seperately. So, is there any method by which i can get values of both date and time from one view???

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• automatically minimized chat tabs

  - by Xiang Ubao

  now I have a very urgent matter, ask for your help.Because we must call fu.init in hideFlashCallback to pause our game, When the user is in the another page to open chat tabs to our game, the game will pause automatically. Is there a method like FB API or something at the beginning of the loading game, automatically minimized chat tabs, so as to solve our problems.Hope you reply to us, help us to solve the problem. Thanks a million.

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• NullPointerException in Console's readLine()

  - by dmindreader

  This: Console c = System.console(); String readline; String u = c.readLine("%s", "args"); Throws a NullPointerException. Yet the signature of the method is: public String readLine(String fmt, Object... args) Why's this exception being thrown?

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• Java weird generic return type

  - by drozzy

  Browsing through Guava libraries I saw this weird signature on a readLines method from Files class: public static <T> T readLines(File file, Charset charset, LineProcessor<T> callback) I know a little bit about generics in java, but this baffled me. What does the double T mean here? And why is the first one in angled brackets?

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• Way to identify a particular exception from exception class

  - by Jibu P C_Adoor

  Hiii. Is there any way to uniquely identify a particular exception from the general exception class. i.e any property or method that retrieves a unique identifier that to identify a particular exception.

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• Calling other servlet methods from JSP

  - by saloni

  I am making a servlet program. It is working fine, but now I am trying to make a method other than doGet or doPost that get called from JSP. Is it possible?

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• doublebuffering not reducing the flicker

  - by fishhead

  I am drawing an grid-work of objects in a Panel. when I scroll the the panel quickly I get a flicker. I thought that enabling the double buffering may take care of this but what I find is that it does not completely draw everything and I am left with blank sections. could anyone give me suggestions as to what may be happening and how I might correct it. UPDATE: I found that I was creating the graphics object with Creategraphics() rather than using the Parameter in the paint method

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• Remove leading zero's from alphanumeic text

  - by cedar715

  I've seen questions to prefix zeros here in SO. But not the other way !! Can you guys suggest me how to remove the leading zeros in alphanumeric text. Are there any built-in APIs or do I need to write a method to trim the leading zero's? Example: 01234 converts to 1234 0001234a converts to 1234a 001234-a converts to 1234-a 101234 remains as 101234 2509398 remains as 2509398 123z remains as 123z 000002829839 converts to 2829839

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• zooming imageview

  - by M.A. Cape

  Can anyone help on how to use the matrix scaletype to zoom an imageview and also how to use the translate method so that it can be focused at the center? I have tried using webview to be able to use the zooming and scrolling functionalities i needed but it is not nice to look at.

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• Converting DTOs to View Models

  - by illvm

  Does anyone know of a good (read: quick to code) method for converting DTOs to View Models or mapping DTO members to View Model members? Lately I've been finding myself writing many conversion and helper methods but this is a very arduous and tedious task. Moreover, it will often needs to be done twice (DTO - View Model, View Model - DTO). Is there a methodology, technique, or technology which would allow me to do this more quickly and efficiently?

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• How can I change a connection string, or other app settings, at test time in Visual Studio 2008?

  - by David

  I need to test a class library project in VS. This project, itself, does not have a web.config file, but the classes do on the web server to which it's deployed. I access these like this: ConfigurationManager.ConnectionStrings["stringname"].ConnectionString; Can I adjust these strings while running unit tests in VS? Should I have considered a different design method to avoid this problem?

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• Google maps : Possible to add multiple businesses with co-ords not postcode?

  - by Haroldo

  We're keen to get our database of businesses onto googlemaps' own database by uploading a data file here : http://www.google.com/local/add/analyticsSplashPage?hl=en-gb&gl=gb our address data is in co-ords format but it looks like it only works with a postcode - is there a method for using co-ordinates instead?

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• how to pass a parameter safely into linq to sql

  - by Blankman

  If I want to get a user that has the email address of '[email protected]', how do I pass that as a parameter in linq? ie.: var a = from u in Users where u.Email = @email Select u; So this would be used in my method: public static GetuserByEmail(string email) Do I just pass in the variable or?

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• C# documentation generator?

  - by ryeguy

  Is there any kind of documentation generator for C#? Like something that would put the xml-ish documentation right above the method/class declarations? Is there a tool or is it tucked away somewhere in VS 2008?

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• Can i return a value instead of a view from my controller?

  - by Flexo

  I would like to return the id of a newly created object for my ajax call instead of returning the view associated with the controller method.

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• Matlab, index from starting location to last index

  - by ccook

  Say you have an array, data, of unknown length. Is there a shorter method to get elements form a starting index to the end than subdata = data(2:length(data))

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• Is there anyway to duplicate the intellisense provided by the Color struct in visual studio?

  - by Robin Robinson

  What I want to do is provide some public static fields that will be used as instances of an interface implementation and have intellisense pick them up when the interface is a method argument. The idea is to have it look like an enum to the developer. I reference Color because basically this is the behavior I want, I just don't know how to replicate it.

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• DataGrid SelectionChanged happens too often

  - by Tokk

  Hey, Guys As I have a DataGrid as another DataGrid's RowDetailsTemplate, I've got a strage effekt. If I Change selection in my inner DataGrid, the SelectionChanged-Method in the outer Grid is automatically caled, too. I don't know why, but I would like to know, what I can do against this. Thx

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• priority Queue destructor

  - by russell

  How do I delete all elements from a priority queue? That means how do I destroy a priority queue? advanced thanks for u answer. Is there any clear- or erase-like method?

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• Change "to_sentence" for Arrays of one specific Model in Rails

  - by mirithil

  Is it possible to override the to_sentence method just for one model in my rails application? More generally, how do I modify methods for an Array of my models?

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