Since 1998, DevX has helped people start businesses, build websites, and provide enterprise technology to people globally. Interviewing the likes of Microsoft’s co-founder, Steve Ballmer, the publication brings comprehensive, reliable, and accessible insights to the Internet.
Did you ever find a need to change the orientation of a word document? If yes, you can quickly do that by navigating to the ???Page Layout??? menu and choose the Landscape/Potrait orientation option.
Java collections – performance (Time Complexity) A set is a collection that contains no duplicate elements. Add Next Contains Data StructureHashSet O(1) O(h/n) O(1) Hash TableEnumSet O(1) O(1) O(1) Bit
Files have multiple properties and they are interesting to use. In fact, your own file system can be developed using them. Create a file named PATH.txt and try this program
System.Math provides the BigMul method for cases where you have to find the product of two large integer numerals that may result in a value that would cause an System.Overflow
Newtomsonft.json has helper methods that help to serialize objects to JSON. See below for a code snippet that uses the library and helps convert an object to JSON format. public
The ErrorProvider control is quite useful when it comes to user input validation. The next code segment assumes an ErrorProvider control named errorProvider1 has been placed on a form along
Java collections – performance (Time Complexity) A list is an ordered collection of elements. Add Remove Get Contains Data StructureArrayList O(1) O(n) O(1) O(n) ArrayCopyonWriteArrayList O(n) O(n) O(1) O(n) ArrayLinkedList
BlockingQueue in Java is more advanced Queue. It performs all functionalities of a Queue in addition to certain qualities. It waits for the Queue to be non empty before retrieving an element using take() method and holds on for a placeholder to be available before it can add an element to the Queue using the put() method. BlockingQueue is an Interface and can be used as below. We are trying to initialize an ArrayBlockingQueue with size of 5. BlockingQueue intQueue = new ArrayBlockingQueue(5); intQueue.put() will add the data and wait for a space if it is full. intQueue.take() will remove the element at the head of the Queue.
In order to flood fill drawn objects, you can make use of the next sample: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace FloodFill { public partial class Form1 : Form { public Form1() { InitializeComponent(); } Bitmap bm; Graphics g; private bool SameColor(Color c1, Color c2) { return ((c1.A == c2.A) && (c1.B == c2.B) && (c1.G == c2.G) && (c1.R == c2.R)); } private void tobien1(Bitmap bm, Point p, Color Color, Color LineColor) { Stack S = new Stack(); S.Push(p); while (S.Count != 0) { p = S.Pop();
Many times, it is tough to traverse up the control tree to reach the parent control. The best example is of a control in a template column of a grid.
There are cases in our math calculations where we would need absolute values of negative numbers. System.Math class’s Abs method helps in such cases. It returns the absolute value of
There are cases in our math calculations where we would need absolute values of negative numbers. System.Math class’s Abs method helps in such cases. It returns the absolute value of
SendKeys is very powerful. You can use SendKeys to send a different keycode from the one that was pressed. For example: private void TextBox1_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode
Some of the most useful tools that work in association with the w3af web application security scanner, are listed below: Wapiti (http://wapiti.sourceforge.net/): a Python-based script that discovers attackable URLs and
Windows calculator can be used for many functions such as date calculation and unit conversion beyond its normal computation. Open the calculator then go to the view menu and choose
In the old versions of .NET, we needed to override the default context menu and override the ProcessCmdKeyfunction to return True to disable Copy-Paste of content into textboxes through keys
String.join is an easy-to-use utility method in String class. public class StringJoin{ public static void main(String args[]){ //The first argument (refered as joinString) is used to join the subsequent argument(s)
It is quite easy to get the “Everyone” account name, with the help of the DirectorySecurity and SecurityIdentifier classes. Here is a small example of getting the name and allowing
To call Java methods using Lambda expressions you can use: – Car::makeCar //Static method of a class- Car::drive // Method of an instance- Car::new //Constructor of a class- Car::drive //
Yes, you can set multiple projects to be startup projects in Visual Studio. Right click on a solution file in Visual Studio. Choose “Set startup projects.” In the dialog that
A lot of time is spent on navigating in the HTML View of ASP.NET Pages that have too much HTML to find some little details. Visual Studio 2005 IDE provides
A lot of time is spent on navigating in the HTML View of ASP.NET Pages that have too much HTML to find some little details. Visual Studio 2005 IDE provides
The Appendtext method will automatically position the cursor to the end of the text, so that it will always show the last added text. If you need to avoid that,
You can restrict the connection to a database by specifying Single User mode, as shown below: USE master;GOALTER DATABASE YourDatabaseNameSET SINGLE_USERWITH ROLLBACK IMMEDIATE;GOALTER DATABASE YourDatabaseNameSET READ_ONLY;GOALTER DATABASE YourDatabaseNameSET MULTI_USER;GO This
Ideally, this is a performance enhancement and needs lot of visibility before hand to implement at early stages. There are numerous cases when you are running on low memory and want to limit the data in your transactions.Especially, when you are sure that you dont need all the records matching your query, you can have criterias set. Stil, there could be plenty of them returned and you may want just a handfull of them or a little more. In MySQL, LIMIT is a feature that helps fetch a certain number of records matching the criteria provided Eg: SELECT * FROM `database_name`.`table_name` LIMIT 10; The value of LIMIT is defined by what your need is. Use it accordingly to allow only the specified records is returned so that you also benefit with performance and quicker processing.
Availability is measured in so-called nines notation, that corresponds to the percentage of time that a service is available. For example, if a service is available 99.9% of the time, we can say that has “three-nines availability”. This notation is used to gives us the specific amount of downtime that a service is allowed to have. Next are the availability and downtime calculations for 99% availability to 99.999% availability : 99% availability (two-nines): * 3.65 days/year (of allowed downtime) * 7.20 hours/month * 1.68 hours/week * 14.4 minutes/day 99.9% availability (three-nines): * 8.76 hours/year * 43.8 minutes/month * 10.1 minutes/week * 1.44 minutes/day 99.99% availability (four-nines): * 52.56 minutes/year * 4.38 minutes/month * 1.01 minutes/week * 8.66 seconds/day 99.999% availability (five-nines): * 5.26 minutes/year * 25.9 seconds/month * 6.05 seconds/week * 864.3 mimiseconds/day
C# provides you a way to escape the problematic characters in a string through the ???@??? symbol. Just place it before the string, and the compiler will escape those characters.For e.g. String filePath = @???c:windowssystem32???;Thus you do not have to escape the slashes in the string in the above example.
You can easily access a website’s certificate in Chrome via the developer tools. Go to developer tools (F12), Security tab. In the Security Overview section, choose “view certificate.”
Avoid?Scrolling?in?the?same?document?for?some?information. Using?the windows?”split”?feature?available?in?the?VS.NET IDE?and?you?can?split?the?document?window?into?two?and?have?two?windows?with?the?same?content?aligned?horizontally. You?can?thus?find?the?information?you?were?looking?for?and?avoid?long?scrolls.
Learn how to handle all of the exceptions from your WPF applications in one place. Avoid writing Try/Catch blocks everywhere in your code unless you really need them. Please note:
