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• "this" in function parameter

  - by chris

  Looking at some code examples for HtmlHelpers, and I see declarations that look like: public static string HelperName(this HtmlHelper htmlHelper, ...more regular params ) I can't remember seeing this type of construct any where else - can someone explain the purpose of the "this"? I thought that by declaring something public static meant that the class did not need to be instantiated - so what is "this" in this case?

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• How to retrieve the integer value of an enum?

  - by Natrium

  I have an enum public enum Color { Red = 0, Blue = 1, Yellow = 2 } When I do this: Color color = Color.Blue; Console.Writeline(color.Value); I want to see it's integer-value (1 in this case, but it outputs "Blue" instead. How can I solve this? I use .NET 3.5.

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• How to detect working internet connection in C#?

  - by detariael

  I have a C# code that basically uploads a file via FTP protocol (using FtpWebRequest). I'd like, however, to first determine whether there is a working internet connection before trying to upload the file (since, if there isn't there is no point in trying, the software should just sleep for a time and check again). Is there an easy way to do it or should I just try to upload the file and in case it failed just try again, assuming the network connection was down?

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• HTML Canvas and saving the data on the server

  - by snitko

  Say I've written a simple app that draws circles in browser. Now I'd like to let people save their pictures. How would I store the data on the server? Which format would be the best option? Should I simply store the relevant html? What would be the case when I would want to make a custom format that is stored on the server and parsed back to html canvas when loaded?

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• how to tell which object called a delegate method (objective c)

  - by user353877

  Let's say you have two objects (UITextviews) in your class. When the text view changes, you have a delegate method that catches the change.. but how can you tell programatically WHICH object was changed and called the delegate ?? I have to be missing something, because this should be trivial, but I couldnt find anything. Note: In this case, its not possible to just break up the class to only have one object (there by bypassing ambiguity).. I looked for things like assigned variable names for nsobjects, nothing there

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• pointer uchar* question in opencv vc++ 2008

  - by kaushalyjain

  img_hsv is a Mat element of an hsv image! when i give cout<<*img_hsv.data+10; it gives true value of the pixel ie 79 as output. but when i assign uchar * a=img_hsv.data+10; it gives me some other value... can you please explain me why is this the case? thanks!

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• CF - How do i access a .gif in my Resources folder

  - by no9

  Hello. I have added a simple .gif file into Resources folder in my project. Now i have created a user control with pictureBox. How can i add the .gif to pictureBox.Image = new Bitmap (path). What is the path in this case? thanx !

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• Application self aware of external database record modifications.

  - by Khou

  How do you make your application aware that a database record was changed or created by an external application rather than the application itself? Do you add a special check sum to the database record or what do you do to stop external changes to the database? (in case it was hacked and the hacker decides to add a new record or change an existing database record)

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• how to load c# object side by side

  - by mamu

  We have serialized value of some objects persisted. Now we want to make substantial changes to some objects. So what i want to do is load older version of object using old assembly then deserialize and serialize again with newer version of the object. I can have convert method which can transform old object to new one. i have been converting object on fly on deserializer but in this case it's almost new object with same name.

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• MySQL- complex data query in a single statement

  - by yoda

  Hi, Consider the following structure : Ignore the table user_token. Now, imagine that you need to get all the roles related to an user, wich may be through it's related groups or directly related to him. In case the same role appears related to a group and the user directly, the role related to the user will prevail over the role given by the group. Is there any chance this could be done in a single query? Cheers!

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• How deep are your unit tests?

  - by John Nolan

  The thing I've found about TDD is that its takes time to get your tests set up and being naturally lazy I always want to write as little code as possible. The first thing I seem do is test my constructor has set all the properties but is this overkill? My question is to what level of granularity do you write you unit tests at? ..and is there a case of testing too much?

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• how to this query in right syntax or right way??

  - by MZT

  i write this query using t-sql and give me an error (Incorrect syntax near the keyword 'OR') How to write it in correct way ? SELECT SUM(Quantity) FROM Invoices WHERE Invoices.InvoiceDocStatusID = CASE @InventoryType WHEN 1 THEN ((2)OR(1)) ELSE 2 END

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• c# Best class to hold a list of values to look up after

  - by ase69s

  I have a list of values that i need to check against a constant list to know wheter they are present or not (one by one). Im using a dictionary buy it doesnt seem logical to have the value two times (key, value)...isnt there any class specialized for this case (and faster if possible)?

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• How computer multiplies 2 numbers?

  - by ckv

  How does a computer perform a multiplication on 2 numbers say 100 * 55. My guess was that the computer did repeated addition to achieve multiplication. Of course this could be the case for integer numbers. However for floating point numbers there must be some other logic. Note: This was asked in an interview.

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• Best way to get the highest sum from a Matrix (using Java but algorithm is the issue here)

  - by user294896

  Sorry I dont know the correct terminology to use but I have a 3x3 matrix like this 1 3 4 5 4 5 2 2 5 and I want get the highest score by picking a value from each row/column but I cant pick the same row or column more than once , so the answer in this case is 3 + 5 + 5 = 13 (row0,col1 + row1,col0 + row2,col2) 4 + 5 + 5 = 14 is not allowed because would have picked two values from col2 I'm using Java, and typically the matrix would be 15 by 15 in size. Is there a name for what Im trying to do, and whats the algorithm thanks Paul

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• How to get the name of the method that caused the exception

  - by SKumar

  My code looks as below. try { _productRepo.GetAllProductCategories(); } catch (Exception ex) { //Do Something } I need a way to show the method name, suppose in the above case if any exception is thrown in the GetAllProductCategories() method, I need to get this method name i.e. "GetAllProductCategories()" as my result. Can any one suggest me how to do this?

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• MySQL: Check if first character is _not_ A-Z

  - by dbemerlin

  I have to create an SQL Query to get all rows starting with a specific character, except if the parameter passed to the (PHP) function is 0, in that case it should get every row that does not start with A - Z (like #0-9.,$ etc). What is the easiest and fastest way to get those rows? DB: MySQL 5.1 Column: title

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• Check in Javascript if a SSL Certificate is valid

  - by MB

  Hi. Is there a way to check in Javascript if given a host it's SSL certificate is valid? (non blocking) In my case I want to display: "you can also use https://.." if via javascript I can make a request to https://my_url without being asked to accept an untrusted certificate. Can this be done asynchonously? -- M.

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• php - How do I fix this illegal offset type error

  - by Steven

  I'm getting "illegal offset type" error for every iteration of this code. Here's the code in case anyone can help: $s = array(); for($i=0;$i<20;$i++){ $source = $xml->entry[$i]->source; $s[$source] += 1; } print_r($s) Any ideas. Thanks in advance.

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• How do I get the last non-empty line of a file using tail in Bash?

  - by debugger

  How do I get the last non-empty line using tail under Bash shell? For example, my_file.txt looks like this: hello hola bonjour (empty line) (empty line) Obviously, if I do tail -n 1 my_file.txt I will get an empty line. In my case I want to get bonjour. How do I do that?

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• remove the id attribute from a div using jquery?

  - by getaway

  i want to remove the id attribute from this image: <img width="270" class="thumb" id="thumb" height="270" src="img/1_1.jpg" /> i tried doing this: $('img#thumb').RemoveAttr('id','none'); but its not remving it! thanks EDIT: $('img#thumb').attr('src', response); $('img#thumb').attr('id', 'nonthumb'); this deosnt load the picture, or in this case the src!! but when i remove the id attribute, it works fine

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• java dynamic function calling

  - by dpaksp

  here is that case....i have an String array that contains only method names of yyyyyy.java file in xxxxxx.java file am creaing yyyyyy.java 's instance (say obj) now i have access obj.fuction_name....that function i should get from that String array in loop ...is that possible ... thank u

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• C++: ptr->hello(); /* VERSUS */ (*ptr).hello();

  - by Joey

  i was learning about c++ pointers... so the "-" operator seemed strange to me... instead of ptr-hello(); one could write (*ptr).hello(); because it also seems to work, so i thought the former is just a more convenient way is that the case or is there any difference?

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• Hibernate's version values in Grails app

  - by xain

  I'm looking at a database dump file, and I see many records in various tables with their version number set in values other than 0 (even 94 in one case). I understand it has to do with hibernate locking strategy, but my concern is that today is Sunday, and the site has almost no visitors so is: is this normal ? Or is there a known hibernate bug or even some programming malpractice producing this ?

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• PL/SQL REGEXP_LIKE testing string for allowed characters

  - by Arino

  I need to verify that the provided string has only allowed characters using Oracle regular expressions (REGEXP_LIKE). Allowed chars are: abcdefghijklmnopqrstuvwxyz0123456789_-. Trying to execute SELECT CASE WHEN REGEXP_LIKE('abcdefghijklmnopqrstuvwxyz0123456789_-.' , '^[a-z0-9_\-\.]+$') THEN 'true' ELSE 'false' END tmp FROM dual; results in 'false'. Any ideas on this?

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