w3mentor

Exception class hierarchy in Java

admin — Sat, 28 Jan 2012 20:15:52 +0000

Exception AclNotFoundException ActivationException UnknownGroupException UnknownObjectException AlreadyBoundException ApplicationException AWTException BadLocationException ClassNotFoundException CloneNotSupportedException ServerCloneException DataFormatException ExpandVetoException GeneralSecurityException CertificateException CertificateEncodingException CertificateExpiredException CertificateNotYetValidException CertificateParsingException CRLException DigestException InvalidAlgorithmParameterException InvalidKeySpecException InvalidParameterSpecException KeyException InvalidKeyException KeyManagementException KeyStoreException NoSuchAlgorithmException NoSuchProviderException SignatureException UnrecoverableKeyException IllegalAccessException InstantiationException InterruptedException IntrospectionException InvocationTargetException IOException ChangedCharSetException … Continue reading →

Example of echo server in Java

admin — Sat, 28 Jan 2012 20:13:15 +0000

try { ServerSocket s = new ServerSocket(1234); // Create server while (true) { Socket c = s.accept(); // Await connection InputStream i = c.getInputStream(); // Get input stream OutputStream o = c.getOutputStream();//Get output stream do { byte[] line = new … Continue reading →

Example of Echo Client in Java

admin — Sat, 28 Jan 2012 20:11:27 +0000

Socket s = new Socket("192.168.1.1", 123); // Create socket InputStream i = s.getInputStream(); // Get input stream OutputStream o = s.getOutputStream(); // Get output stream String str; do { byte[] line = new byte[100]; System.in.read(line); // Read from console o.write(line); … Continue reading →

Recursively calculaate Fibonacci Sequence in Java

admin — Sat, 31 Dec 2011 14:01:51 +0000

public class Fibonacci { private int calculate(int length) { if (length < 0) { throw new IllegalArgumentException("Input must be greater than zero"); } if (length <= 1) { return length; } else { return calculate(length - 1) + calculate(length … Continue reading →

Compute factorial using for loop in Java

admin — Sat, 31 Dec 2011 14:00:20 +0000

public class Factorial { int calculate(int number) { if (number < 0) { throw new IllegalArgumentException("integer must be greater than zero"); } if( number == 0 || number == 1) return 1; else { int total = 1; for … Continue reading →

Calculate factorial using recursion in Java

admin — Sat, 31 Dec 2011 13:58:03 +0000

package com.w3mentor.examples.factorial; public class Factorial { int calculate(int number) { if (number < 0) { throw new IllegalArgumentException("integer must be greater than zero"); } if( number == 0) { return 1; } else { return number * calculate … Continue reading →

Query processes using LINQ to find windows services

admin — Mon, 15 Aug 2011 17:34:33 +0000

IEnumerable<Process> pList = from proc in Process.GetProcesses() where String.Equals(proc.ProcessName, "svchost") select proc;

Simple LINQ to Objects example

admin — Mon, 15 Aug 2011 17:30:13 +0000

List<Employee> employees = new List<Employee>() { new Employee { ID=1, Name="Ravi", JoinDate=new DateTime(2002, 1, 15) }, new Employee { ID=2, Name="Raja", JoinDate=new DateTime(2002, 3, 17 }, new Employee { ID=3, Name="Mani", JoinDate=new DateTime(2007, 2, 11) } }; IEnumerable<Employee> query … Continue reading →

Query public types in an assembly using LINQ

admin — Mon, 15 Aug 2011 17:28:10 +0000

IEnumerable<string> publicTypes = from t in Assembly.GetExecutingAssembly().GetTypes() where t.IsPublic select t.FullName; foreach (string name in publicTypes) { Console.WriteLine(name); }

Type Validation Functions in PHP

admin — Tue, 07 Jun 2011 15:45:40 +0000

is_array() – Test for Arrays is_bool() – Test for Booleans (TRUE, FALSE) is_float() – Test for Floating-point numbers is_int() – Test for Integers is_null() – Test for NULLs is_numeric() – Test forNumeric values, even as a string (e.g., ‘ 20′ … Continue reading →

Get phone number in android using Java

admin — Sat, 04 Jun 2011 15:31:43 +0000

private String getMyPhoneNumber(){ TelephonyManager mTelephonyMgr; mTelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); return mTelephonyMgr.getLine1Number(); } private String getMy10DigitPhoneNumber(){ String s = getMyPhoneNumber(); return s.substring(2); }

Check network connection availability on android using Java

admin — Sat, 04 Jun 2011 15:16:34 +0000

public boolean checkTheNetworkAvailability() { Context mycontext = getApplicationContext(); ConnectivityManager myconnectivity = (ConnectivityManager) mycontext.getSystemService(Context.CONNECTIVITY_SERVICE); if (myconnectivity == null) { return false; // failed null!.. } else { NetworkInfo[] myinfo = myconnectivity.getAllNetworkInfo(); if (myinfo != null) { for (int i = 0; … Continue reading →

Hide the status bar on android

admin — Sat, 04 Jun 2011 15:14:11 +0000

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

Hide title bar on android

admin — Sat, 04 Jun 2011 15:13:25 +0000

requestWindowFeature(Window.FEATURE_NO_TITLE); requestWindowFeature(Window.FEATURE_PROGRESS);

Android enable disable wifi on phone

admin — Sat, 04 Jun 2011 15:12:03 +0000

WifiManager mywifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); mywifi.setWifiEnabled(enabled);

Hide a file in C#

admin — Wed, 01 Jun 2011 16:42:04 +0000

File.SetAttributes(filePath, File.GetAttributes(filePath) | FileAttributes.Hidden);

Check if a file is system file in C#

admin — Wed, 01 Jun 2011 16:41:37 +0000

bool isSystem = ((File.GetAttributes(filePath) & FileAttributes.System) == FileAttributes.System);

Check if a file has archive attribute in C#

admin — Wed, 01 Jun 2011 16:41:10 +0000

bool isArchive = ((File.GetAttributes(filePath) & FileAttributes.Archive) == FileAttributes.Archive);

Check whether a file is hidden in C#

admin — Wed, 01 Jun 2011 16:40:37 +0000

bool isHidden = ((File.GetAttributes(filePath) & FileAttributes.Hidden) == FileAttributes.Hidden);

Check if a file is read only in C#

admin — Wed, 01 Jun 2011 16:39:59 +0000

bool isReadOnly = ((File.GetAttributes(filePath) & FileAttributes.ReadOnly) == FileAttributes.ReadOnly);

Display the call stack method names in C#

admin — Wed, 01 Jun 2011 16:38:58 +0000

using System.Diagnostics; [STAThread] public static void Main() { //obtain call stack StackTrace stackTrace = new StackTrace(); // obtain method calls (frames) StackFrame[] stackFrames = stackTrace.GetFrames(); // display method names foreach (StackFrame stackFrame in stackFrames) { Console.WriteLine(stackFrame.GetMethod().Name); // output … Continue reading →

Get Name of the calling method using Reflection in C#

admin — Wed, 01 Jun 2011 16:37:36 +0000

using System.Diagnostics; // get call stack StackTrace stackTrace = new StackTrace(); // get calling method name Console.WriteLine(stackTrace.GetFrame(1).GetMethod().Name);

C# Enqueue and Dequeue queue operations

admin — Tue, 24 May 2011 20:50:34 +0000

Queue<string> myQueue = new Queue<string>(); void AddQueueItem(string request) { myQueue.Enqueue(request) ; } string GetNextQueueItem() { return myQueue.Dequeue() ; }

Stack push and pop in C#

admin — Tue, 24 May 2011 20:48:59 +0000

Stack<string> myStack = new Stack<string>() ; void addRecord(string move) { myStack.Push(move); } string GetLastRecord() { return myStack.Pop(); }

Arraylist properties and methods in C#

admin — Tue, 24 May 2011 20:16:26 +0000

ArrayList alphaList = new ArrayList(); alphaList.Add("A"); alphaList.Add("D"); alphaList.Add("W"); Console.WriteLine("Original Capacity"); Console.WriteLine(alphaList.Capacity); Console.WriteLine("Original Values"); foreach (object alpha in alphaList) { Console.WriteLine(alpha); } alphaList.Insert(alphaList.IndexOf("D") , "C"); alphaList.Insert(alphaList.IndexOf("W") , "J"); Console.WriteLine("New Capacity"); Console.WriteLine(alphaList. Capacity); Console.WriteLine("New Values"); foreach (object alpha in alphaList) { … Continue reading →

Declare and fill a two-dimensional array in C#

admin — Tue, 24 May 2011 20:13:17 +0000

int[, ] my2DArray = { { 1, 1 }, { 3, 5 }, { 5, 7 } }; for (int i = 0; i <= my2DArray. GetUpperBound(0) ; i++) { for (int x = 0; x <= my2DArray.GetUpperBound(1); x++) { … Continue reading →

Foreach loop to iterate through the elements of the array in C#

admin — Tue, 24 May 2011 20:10:59 +0000

int[] intArray = { 1, 2, 3, 4, 5 }; Console.WriteLine("Upper Bound"); Console.WriteLine(intArray. GetUpperBound(0) ); Console.WriteLine("Array elements") ; foreach (int item in intArray) { Console.WriteLine(item) ; } Array.Reverse(intArray) ; Console.WriteLine("Array reversed") ; foreach (int item in intArray) { Console.WriteLine(item) ; … Continue reading →

Test if number is even or odd in C

admin — Mon, 09 May 2011 23:37:18 +0000

#include <iostream> using namespace std; int main() { int n, remainder; cout << "Enter a number and press ENTER: "; cin >> n; remainder = n % 2; if (remainder == 0) cout << "The number is even." … Continue reading →

Calculate square of a number in C

admin — Mon, 09 May 2011 23:35:17 +0000

#include <iostream> using namespace std; int main() { double n; cout << "Input a number and press ENTER: "; cin >> n; cout << "The square is: " << n * n << endl; system("PAUSE"); return 0; }

Convert celsius to farenheit in C++

admin — Mon, 09 May 2011 23:26:08 +0000

#include <iostream> using namespace std; int main() { double ctemp; // Celsius temperature double ftemp; // Fahrenheit temperature cout << "Input a Celsius temp and press ENTER: "; cin >> ctemp; ftemp = (ctemp * 1.8) + 32; cout … Continue reading →

Printing multiple lines in C++

admin — Mon, 09 May 2011 23:24:12 +0000

#include <iostream> using namespace std; int main() { cout << "welcome," << endl; cout << "to the website." << endl; cout << "w3mentor.com!" << endl; system("PAUSE"); return 0; }

Urlencoding in PHP using urlencode

admin — Mon, 02 May 2011 16:40:51 +0000

<?php $myurlparam = "hello this is a test message"; $site = "http://www.w3mentor.com"; $query = $site; $query .= "&message=".urlencode( $myurlparam ); echo $query; ?>

Compare two arrays to see if value from form post exists in PHP

admin — Mon, 02 May 2011 16:35:25 +0000

<?php $choices = array('my choice 1', 'my choice 2', 'my choice 3'); $valid = true; if (is_array($_GET['inputArray'])) { $valid = true; foreach($_GET['inputArray'] as $input) { if (!in_array($input, $choices)) { $valid = false; } } if ($valid) { echo … Continue reading →

Using Radio buttons in PHP Form

admin — Mon, 02 May 2011 16:30:16 +0000

<html> <body> <form action="mychoice.php" method="post"> <b>Enter Name:</b> <input type="text" size="45" name="username"> <br> <b>Please select your favorite animal:</b> <br> <input type="radio" name="animal" value="dog">Dog <input type="radio" name="animal" value="cat">Cat <input type="radio" name="animal" value="fish">Fish <br> <input type="submit" value="Submit"> </form> </body> </html> File: … Continue reading →

Radio button validation in PHP using array_key_exists

admin — Mon, 02 May 2011 16:26:22 +0000

<?php $animals = array('dog' => 'D', 'cat' => 'C', 'bird' => 'B'); foreach ($animals as $key => $animal) { echo "<input type='radio' name='animal' value='$key'/> $animal \n"; } if (!array_key_exists($_POST['animal'], $animals)) { echo "You must select a valid animal."; } … Continue reading →

Positioning elements on a Silverlight Canvas

admin — Tue, 26 Apr 2011 23:48:12 +0000

The Canvas.Top and Canvas.Left attributes can be set within the children control’s XAML to position within the Canvas relatively. <UserControl x:Class='TestSilverlightApplication.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <StackPanel Orientation="Vertical" Background="Blue"> <Canvas x:Name="MyCanvas" HorizontalAlignment="Left" VerticalAlignment="Top" Height="200" Width="400" Background="White" Margin="10"> <TextBlock … Continue reading →

Set padding in silverlight code behind

admin — Tue, 26 Apr 2011 23:39:02 +0000

Xaml: <UserControl x:Class='TestSilverlightApplication.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <Canvas Name="canvas1"> </Canvas> </UserControl> Code behind: namespace TestSilverlightApplication { public partial class MainPage : UserControl { Button mybutton = null; public MainPage() { InitializeComponent(); } private void … Continue reading →

Change canvas background in Silverlight .Net

admin — Tue, 26 Apr 2011 23:36:05 +0000

Merge Datasets using C#

sbm — Thu, 21 Apr 2011 01:48:52 +0000

We can merge a dataset to another dataset using Merge. Lets assume we have two datasets ds1 and ds2. DataSet ds1 = new DataSet(); da1.Fill(ds, "temp");

perl abs Function

madhu — Thu, 21 Apr 2011 01:48:49 +0000

PERL abs FunctionPERL abs Function Syntax abs VALUE abs PERL abs Function Definition and Usage Returns the absolute value of its argument. If pure interger value is passed then it will return it as it is but if a string … Continue reading →

printf function in PERL

madhu — Thu, 21 Apr 2011 01:48:47 +0000

PERL printf FunctionPERL printf Function Syntax printf FILEHANDLE FORMAT, LIST printf FORMAT, LIST PERL printf Function Definition and Usage Prints the value of LIST interpreted via the format specified by FORMAT to the current output filehandle, or to the one … Continue reading →

Strip out all html tags in string using C#

admin — Mon, 11 Apr 2011 00:15:00 +0000

The tags need not be correctly nested for the below implementation to work.. public static string RemoveHtmlTags(string pInput) { char[] array = new char[pInput.Length]; int arrayIndex = 0; bool inside = false; for (int i = 0; i < pInput.Length; … Continue reading →

Check if remote files exist using C#

admin — Mon, 11 Apr 2011 00:10:52 +0000

public void CheckFile() { // The two different files as strings. string urlfile1 = "http://remotehost.com/file1.zip"; string urlfile2 = "http://remotehost.com/file2.zip"; try { // Check to see if urlfile1 exists HttpWebRequest myrequest = (HttpWebRequest)WebRequest.Create(urlfile1); myrequest.Credentials = System.Net.CredentialCache.DefaultCredentials; HttpWebResponse response = (HttpWebResponse)myrequest.GetResponse(); … Continue reading →

Ping a host machine to check uptime in C#

admin — Tue, 05 Apr 2011 19:40:52 +0000

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ProgramSendPingtoHost { class ProgramSendPingtoHost { static void Main(string[] args) { try { string hostAddress = "127.0.0.1"; System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping(); System.Net.NetworkInformation.PingReply reply = ping.Send(hostAddress); Console.WriteLine("The Host Address: {0}", reply.Address); … Continue reading →

Convert Enum to Array dynamically in C#

admin — Tue, 05 Apr 2011 19:25:38 +0000

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ProgramEmumtoArray { class ProgramEmumtoArray { static void Main(string[] args) { string[] people = Enum.GetNames(typeof(People)); foreach (var person in people) { Console.WriteLine(person); } Console.Read(); } enum People { Gandhi, Anthony, … Continue reading →

Dynamic enumeration of Enum in C#

admin — Tue, 05 Apr 2011 19:16:45 +0000

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace w3mentorConsoleApp { class Program { static void Main(string[] args) { foreach (var car in Enum.GetValues(typeof(Cars))) { Console.WriteLine(Enum.GetName(typeof(Cars), car)); } Console.Read(); } enum Cars { Ferrari, Polo, GMC, FordExplorer } } … Continue reading →

Sorting a hashtable in C#

admin — Wed, 30 Mar 2011 14:45:06 +0000

Hashtable myHashTable = new Hashtable(); myHashTable.Add("1", "dotnet"); myHashTable.Add("2", "tutorials"); myHashTable.Add("3", "w3mentor"); List<int> myList = new List<int>(); foreach (var key in hash.Keys) { myList.Add(int.Parse(key.ToString())); } //sort the hashtable myList.Sort(); foreach (var item in myList) { Console.WriteLine(string.Format("{0},{1}", item, hash[item.ToString()])); } … Continue reading →

Cloning C# objects using MemberwiseClone

admin — Wed, 30 Mar 2011 14:32:10 +0000

public CarClass GetCopy() { return MemberwiseClone() as CarClass; } CarClass beta = new CarClass(); CarClass newcar = beta.GetCopy(); bool areCarsEqual = ReferenceEquals(beta, newcar); Console.WriteLine("Are cars Equal?: {0}",areCarsEqual);

Example of stringbuilder append operation in C#

admin — Wed, 30 Mar 2011 14:19:08 +0000

void demoAppendSB() { StringBuilder sb; sb = new StringBuilder("This is the existing text"); sb.Append("This will be appended"); Console.WriteLine("sb.Append(\"Appended\"): {0}",sb); }

Delete newly created file from directory in C#

admin — Wed, 30 Mar 2011 14:15:54 +0000

void deleteNewFile(string dirPath) { DirectoryInfo directInfo = new DirectoryInfo(dirPath); //read directory to enumerate files FileInfo[] filelist = directInfo.GetFiles(); var fileList = from n in filelist select new { FileName = n.FullName, CreationDate = n.CreationTime.ToLongDateString() }; //get list of files … Continue reading →

Flowdocument in WPF

admin — Tue, 29 Mar 2011 17:59:33 +0000

The FlowDocument object in WPF can be thought of as a document with contents that can take up/flow to use the available space in the control. The FlowDocument shown below contains controls such as Paragraph, Table, List, Figure and Floater … Continue reading →

Bulletdecorator in WPF

admin — Tue, 29 Mar 2011 17:50:16 +0000

The BulletDecorator control is used to display a single item and bullet in a bulleted list in WPF. The following xaml code shows how to draw a diamond shaped BulletDecorator next to a textblock. <BulletDecorator> <BulletDecorator.Bullet> <Polygon Margin=” 2, 0, … Continue reading →

Using TrimStart and TrimEnd in C# strings

admin — Mon, 28 Mar 2011 01:49:35 +0000

The TrimStart function in C# removes all occurances of a string/character from the beginning of an input string. string testInput="001"; Int val=Conver.ToInt32(testInput.TrimStart('0')); Console.WriteLine(val); Ouput: 1 We can use the TrimEnd function if we need to remove the character at the … Continue reading →

Find minimum and maximum supported decimal values in C#

admin — Mon, 28 Mar 2011 01:44:42 +0000

We can use the following code to find the range for a decimal datatype Console.WriteLine("Minimum value=" + decimal.MinValue); Console.WriteLine("Maximum value=" + decimal.MaxValue); Console.ReadKey();

Delete a specific xml node in xml file using C#

admin — Mon, 28 Mar 2011 01:42:29 +0000

protected void DeleteXmlNode(int selectedIndex) { XmlDocument docXml = new XmlDocument(); docXml.Load(Server.MapPath(@"App_Data\myXmlFile.xml")); //locate and load xml file in application XmlNode node = docXml.DocumentElement.ChildNodes.Item(selectedIndex); //locate specific index node node.ParentNode.RemoveChild(node); //remove node docXml.Save(Server.MapPath(@"App_Data\mynewXmlFile.xml")); //save file }

Write to an Xml file using Xml Writer in C#

admin — Mon, 28 Mar 2011 01:37:40 +0000

C# provides the XmlWriter class which allows developers to write to an Xml file. To begin, we need to import the system.xml namespace. using System.Xml; The system.xml namespace contains the XmlWriter and XmlTextWriter classes. To read an xml file to … Continue reading →

Add custom data to xml node and save xml file in C#

admin — Mon, 28 Mar 2011 01:28:44 +0000

protected void AddNodeToXml() { XmlDocument docXml = new XmlDocument(); docXml.Load(Server.MapPath(@"App_Data\myXmlFile.xml")); //locate the xml file //Create the node to set the data XmlElement element = docXml.CreateElement("userprofile"); XmlElement xmlUser = docXml.CreateElement("User"); XmlElement xmlPass = docXml.CreateElement("Password"); xmlUser.InnerText = this.txtUser.Text.Trim(); xmlPass.InnerText = … Continue reading →

Find a specific node in XML using XmlDocument, XmlNodeList and XmlNode in C#

admin — Mon, 28 Mar 2011 01:23:06 +0000

private void FindXmlDataItem(int sIndex) { XmlDocument docXml = new XmlDocument(); docXml.Load(Server.MapPath(@"App_Data\myXmlFile.xml")); XmlNodeList list = docXml.DocumentElement.ChildNodes; XmlNode node = list.Item(sIndex); this.txtUser.Text = node["User"].InnerText; this.txtPass.Text = node["Password"].InnerText; }

Load xml file to xml dataset and bind to gridview in C#

admin — Mon, 28 Mar 2011 01:14:13 +0000

In the method shown below, we will locate xml file within application, read it to a dataset and then set the xml dataset as datasource to grid view. private void loadandbindXmlData() { DataSet xmlData = new DataSet(); xmlData.ReadXml(Server.MapPath(@"App_Data\myXmlFile.xml")); //locate xml … Continue reading →

Example using Call By Out parameter in C#

admin — Mon, 28 Mar 2011 01:10:36 +0000

public class OPExample { public void Addme(int x, int y, out int result) { result = x + y; } static void Main(string[] args) { OPExample obj = new OPExample(); int a = 1, b = 2, result; obj.Addme(a, … Continue reading →

Image control in WPF

admin — Sun, 27 Mar 2011 20:35:19 +0000

The image control is used to display various formats of images in WPF applications. The basic steps include adding the image control to the window/page and setting its source property. To adjust the dimensions of the image we can set … Continue reading →

Auto variables in different blocks in C

admin — Tue, 22 Mar 2011 15:13:16 +0000

void main() { int p=100; clrscr(); printf("\n P=%d",p); { int p=50; printf("\n P=%d",p); } { int p=40; printf("\n P=%d",p); } printf("\n P=%d",p); } Output P=100 P=50 P=40 P=100 In the above program, the declaration of ‘p’ is made at three … Continue reading →

Automatic Variables in C

admin — Tue, 22 Mar 2011 15:11:57 +0000

auto variables are defined inside a function. A variable declared inside the function without storage class name is, by default, an auto variable. These functions are declared on the stack. The stack provides temporary storage. The scope of the variables … Continue reading →

Access individual elements of array by pointers

admin — Tue, 22 Mar 2011 13:53:27 +0000

Access individual elements of array by pointers In the below program, an integer array num is declared and initialized. ptr is an integer pointer. Pointer ptr points to the num by the statement ptr=num;. We can access every element of … Continue reading →

Initialization of Two-Dimensional Array in C

admin — Tue, 22 Mar 2011 13:40:53 +0000

void main() { int i,j; int num[3][3]={{1,2,3},{4,5,6},{7,8,9}}; clrscr(); printf("Elements of two-dimensional array:\n\n"); for(i=0;i<=2;i++) { for(j=0;j<=2;j++) printf("%5d",num[i][j]); printf("\n"); } getche(); } Output Elements of two-dimensional array: 1 2 3 4 5 6 7 8 9

One-Dimensional Array Initialization in C

admin — Tue, 22 Mar 2011 13:38:48 +0000

main() { int i=0,num[5]; clrscr(); printf("Enter the numbers:"); while(i<5) { scanf("%d",&num[i]); i++; } getche(); }

Getting all installed printers in system using C# .NET

admin — Mon, 21 Mar 2011 01:52:02 +0000

If a printer is installed on the machine, the following code will list the installed printer(s) in the system. Add a listbox named printersList to a windows form and use the following in the form_load. using System.Drawing.Printing; private void Form1_Load(object … Continue reading →

LineBreak and Run in Silverlight/WPF TextBlock

admin — Sun, 20 Mar 2011 02:59:54 +0000

<Grid> <TextBlock> Hello World. <LineBreak />This is the second line. The breaking of the lines in the XAML are <Run Foreground="Red">not significant</Run>. </TextBlock> </Grid> A LineBreak indicates where line breaks are going to occur without regard to the TextWrapping property. … Continue reading →

Example of TextBlock properties in Silverlight/WPF

admin — Sun, 20 Mar 2011 02:58:14 +0000

Paint an image using ImageBrush in Silverlight/WPF

admin — Sun, 20 Mar 2011 02:56:19 +0000

Example of using RadialGradientBrush in silverlight XAML

admin — Sun, 20 Mar 2011 02:50:38 +0000

The RadialGradientBrush brush Paints a gradient between a focal point and a circle on the outside of the shape. <Ellipse> <Ellipse.Fill> <RadialGradientBrush> <GradientStop Color="Black" Offset="0" /> <GradientStop Color="Red" Offset="1" /> </RadialGradientBrush> </Ellipse.Fill> </Ellipse>

Example of using LinearGradientBrush in Silverlight XAML

admin — Sun, 20 Mar 2011 02:48:19 +0000

Drawing a bezier curve in silverlight XAML

admin — Sun, 20 Mar 2011 02:46:30 +0000

We can draw a curved line by populating the Data attribute to a PathGeometry element that specifies a Path and contains a BezierSegment (from 0,50 to 100,50 with control points of 50,0 and 50,100 as the curves). <Path Stroke="Black"> <Path.Data> … Continue reading →

What is asterix or star in grid row and column in XAML

admin — Sun, 20 Mar 2011 02:42:34 +0000

When the height or width of a row or column is set to star, the size is set based on the proportion. Just a star means the content will stretch to fit the available size. Examples: <RowDefinition Height="*" /> //100% … Continue reading →

What is Auto in XAML grid row and column?

admin — Sun, 20 Mar 2011 02:34:41 +0000

If we set the height or width to auto it means that the row or column size will be based on the contents. The size of each row or column will be determined by the largest object in a respective … Continue reading →

Creating rows and columns in grid using XAML

admin — Sun, 20 Mar 2011 02:30:53 +0000

Creating new columns and rows is done using the ColumnDefinitions and RowDefintions properties on a grid. This allows you to specify that individual elements are in a particular row or column using the attached property. <UserControl x:Class="silverlight.Sample" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid> … Continue reading →

How to Deserialize string returned by webservice to an object in C#(CSharp)

admin — Fri, 04 Mar 2011 17:24:55 +0000

public static T Deserialize<T>(string data) { T result; XmlSerializer xSer = new XmlSerializer(typeof(T)); using (StringReader sr = new StringReader(data)) { result = (T)xSer.Deserialize(sr); } return result; } Using it: string result = "<?xml 1.0 ... <person><site>w3mentor.com</site></person>..."; //returned from web service … Continue reading →

How to Serialize any object to string using XmlSerializer for Webservices in C#(CSharp)

admin — Fri, 04 Mar 2011 17:08:34 +0000

public static string Serialize<T>(T dataObject) { StringBuilder sb = new StringBuilder(); if (dataObject != null) { XmlSerializer xSer = new XmlSerializer(typeof(T)); using (StringWriter sw = new StringWriter(sb)) { //for empty namespace XmlSerializerNamespaces ns = new XmlSerializerNamespaces(); ns.Add("", ""); xSer.Serialize(sw, … Continue reading →

Binding output parameters in PERL DBI and MySQL

admin — Wed, 02 Mar 2011 17:21:19 +0000

my $dbh= DBI->connect_cached('DBI:mysql: test','username','password',{private_connection_key1 =>'connX'}) my $sth= prepare('SELECT id, name FROM t1') ; $sth->execute(); my ($id, $name) ; $sth->bind_col(1, \$id); $sth->bind_col(2, \$name); print ($id);

Reading data from MySQL using Perl DBI

admin — Wed, 02 Mar 2011 17:17:54 +0000

We can use prepare to execute read statements. The process is similar to insert statement, except after calling execute( ) , you need to fetch the resultant data set. my $dbh= DBI->connect_cached('DBI:mysql: test','username','password',{private_connection_key1 =>'connX'}) $sth= $dbh->prepare( "select * from testtable" … Continue reading →

MySQL and DBI using binding

admin — Wed, 02 Mar 2011 17:16:02 +0000

my $dbh= DBI->connect_cached('DBI:mysql: test','username','password',{private_connection_key1 =>'connX'}) $sth= $dbh->prepare( "insert into testtable values (?, ?) ") or die " ERROR in prepare: " . $dbh->errstr . "\n"; my $rv= $sth->execute( 1, 'first' ) ; print "rows affected $rv\n" ;

Insert data into table using Perl and MySQL

admin — Wed, 02 Mar 2011 17:13:11 +0000

my $dbh= DBI->connect_cached( ’DBI:mysql: test’ , ‘ username’ , ‘ password’ , { private_connection_key1 => ‘ connX’ }) my $sth= $dbh->prepare("insert into testtable values (1, ‘ first’ ) " ) or die " ERROR in prepare: " . $dbh->errstr . … Continue reading →

Create and display custom objects using JavaScript

admin — Sun, 27 Feb 2011 03:33:46 +0000

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>JavaScript - Create and Display Object Types</title> </head> <script language="JavaScript"> // ************************************************************************ // CREATE AN AUTOMOBILE USING A CONSTRUCTOR // ************************************************************************ function Automobile(manufacturer, model, series) { // ************************************************************************ … Continue reading →

Create a Monthly Auto Loan Payment Calculator in Javascript

admin — Sun, 27 Feb 2011 03:31:16 +0000

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>JavaScript - Loan Calculator</title> </head> <script language="JavaScript"> function calculateLoan() { nMon = document.form1.txtNumerOfMonths.value; iRate = document.form1.txtInterestRate.value; aFinanced = document.form1.txtAmountFinanced.value; mPayment = (iRate * aFinanced)/ nMon; alert('Your monthly payment would … Continue reading →

Illustrate how to manipulate JavaScript variables for web pages

admin — Sun, 27 Feb 2011 03:29:31 +0000

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>JavaScript - Creating JavaScript variables for web pages 1</title> </head> <script language="JavaScript"> // ************************************************************************ // DEFINE BEHAVIOR TO ACCESS ATTRIBUTES // ************************************************************************ function getFullName() { var firstName, lastName, fullName; … Continue reading →

Example of Encapsulation using JavaScript

admin — Sun, 27 Feb 2011 03:24:30 +0000

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>JavaScript - Encapsulation Exercise</title> </head> <body> <p> <script language="JavaScript" type="text/JavaScript"> // ************************************************************************ // CREATE AN AUTOMOBILE USING A CONSTRUCTOR // ************************************************************************ function Automobile(speed) { // ************************************************************************ // PUBLIC … Continue reading →

Example to illustrate Polymorphism using JavaScript

admin — Sun, 27 Feb 2011 03:21:44 +0000

To illustrate Polymorphism using JavaScript we define a base object called Automobile with attributes and behaviors. Then we create sub object called Mercedes and Porshce to share the Automobiles attributes and behaviors. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> … Continue reading →

Example to illustrate Inheritance using JavaScript

admin — Sun, 27 Feb 2011 03:15:54 +0000

In the example we define a base object called Car, and Create sub object called ferrari that inherits attributes from Car. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>JavaScript - Inheritance Example</title> </head> <body> <p> <script language="JavaScript" … Continue reading →

Set background image of excel worksheet using Javascript setbackgroundpicture

admin — Wed, 23 Feb 2011 21:31:35 +0000

var oexcel = new ActiveXObject("excel.application"); oexcel.visible = true; var oworkbook = oexcel.workbooks.add; var oworksheet = oworkbook.worksheets(1); oworksheet.setbackgroundpicture("c:\\myimg.jpg");

How to fill a DataSet Object in C#

admin — Mon, 21 Feb 2011 14:13:27 +0000

Add a Button control named btnLoad and a DataGrid control named dgProducts on the form/page. using System.Data; using System.Data.SqlClient; private void btnLoad_Click(object sender, System.EventArgs e) { // Create a SqlConnection SqlConnection cnn = new SqlConnection( "Data Source=(local); Initial Catalog=Northwind;"+ " … Continue reading →

Using a ADO.NET SqlDataReader Object in C#

admin — Mon, 21 Feb 2011 14:07:10 +0000

Add a Button control (btnGetCustomers) and a ListBox control (lbCustomers) to your form/page. using System.Data; using System.Data.SqlClient; private void btnGetCustomers_Click(object sender, System.EventArgs e) { // Connect to the database SqlConnection cnn = new SqlConnection(); cnn.ConnectionString = "Data Source=(local);" + … Continue reading →

What are the different data provider objects in ADO.NET

admin — Mon, 21 Feb 2011 14:04:11 +0000

The five main data provider objects are: 1.Connection 2.Command 3.Parameter 4.DataReader 5.DataAdapter These are the generic names for the classes defined in System.Data.Common namespace.

How to call web services in asp.net ajax

admin — Sun, 20 Feb 2011 21:52:56 +0000

Calling WebService in ASP.NET AJAX need to create a ServiceReference using ScriptManager>Services and using ScriptReference tag. <asp:ScriptManager runat="server" ID="SM1"> <Services> <asp:ServiceReference Path="MathService.asmx" /> </Services> </asp:ScriptManager> Here it is assumed that you have created a MathService.asmx web service. Note that when … Continue reading →

How to maintain the history (back and forward button) in the browser?

admin — Sun, 20 Feb 2011 21:50:58 +0000

.NET Framework 3.5 with SP1 onwards, ASP.NET AJAX gives us ability to maintain the history of the browser when we perform certain action. This is done by setting the EnableHistory property to “true” and adding the OnNavigate event handler.

How to update the UpdatePanel from server side?

admin — Sun, 20 Feb 2011 21:50:29 +0000

Updating the panel form code behind is easy, you need to call the public method Update() in the code behind and rest will be taken care.

Timer in ASP.NET Ajax

admin — Sun, 20 Feb 2011 21:48:08 +0000

While working with asynchronous postbacks we might want these postback to happen after a specific interval, this can be done using Timer control. This has an event called “OnTick” that is used to specify a server side event that fires … Continue reading →

UpdateProgress in ASP.NET Ajax

admin — Sun, 20 Feb 2011 21:46:36 +0000

UpdateProgress control is used to display a feedback about the action being performed by ASP.NET Ajax. This feedback can be in the form of some image or a text (eg. processing … or please wait ….). This control has one … Continue reading →

How to conditional update UpdatePanel in ASP.NET Ajax?

admin — Sun, 20 Feb 2011 21:44:46 +0000

If more than one UpdatePanel is placed on the page and there is a need of a. Updating only a specific UpdatePanel, we can set UpdateMode as “Conditional” to all the UpdatePanels so that only corresponding UpdatePanel will update on … Continue reading →

UpdatePanel in ASP.NET Ajax

admin — Sun, 20 Feb 2011 21:43:49 +0000

Update Panel is used to update the partial portion of the web page. It has two sub elements 1. ContentTemplate – used to specify the content need to update partially (Look at UpdatePanelSimple.aspx page) 2. Triggers a. AsyncPostBackTrigger – used … Continue reading →

ScriptManager in ASP.NET Ajax

admin — Sun, 20 Feb 2011 21:42:10 +0000

In order to work with ASP.NET AJAX, an .aspx page must have a ScriptManager tag. Without it ASP.NET AJAX doesn’t work as it provides necessary framework to work with UpdatePanel and other ASP.NET AJAX Server controls. Some of the frequently … Continue reading →