Found 35163 Articles for Programming

Set Hashtable collection with elements.Hashtable h = new Hashtable(); h.Add(1, "Jack"); h.Add(2, "Henry"); h.Add(3, "Ben"); h.Add(4, "Chris");Let’s say now you need to find any key, then use the Contains() method. We are finding key 3 here −h.Contains(3);The following is the complete example.Example Live Demousing System; using System.Collections; public class Demo {    public static void Main() {       Hashtable h = new Hashtable();       h.Add(1, "Jack");       h.Add(2, "Henry");       h.Add(3, "Ben");       h.Add(4, "Chris");       Console.WriteLine("Keys and Values list:");       foreach (var key in h.Keys ) ... Read More

The following is our Hashtable −Hashtable h = new Hashtable(); h.Add(1, "Jack"); h.Add(2, "Henry"); h.Add(3, "Ben"); h.Add(4, "Chris");To remove an item, use the Remove() method. Here, we are removing the 3rd element.h.Remove(3);Let us see the complete example.Example Live Demousing System; using System.Collections; public class Demo {    public static void Main() {       Hashtable h = new Hashtable();       h.Add(1, "Jack");       h.Add(2, "Henry");       h.Add(3, "Ben");       h.Add(4, "Chris");       Console.WriteLine("Initial list:");       foreach (var key in h.Keys ) {          Console.WriteLine("Key = ... Read More

The "C" (or currency) format specifier is used to convert a number to a string representing a currency amount.Let us see an example.double value = 139.87;Now to display the above number until three decimal places, use (“C3”) currency format specifier.value.ToString("C3", CultureInfo.CurrentCulture)Let us see another example.Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       double value = 234.66;       // displays $       Console.WriteLine(value.ToString("C", CultureInfo.CurrentCulture));       Console.WriteLine(value.ToString("C3", CultureInfo.CurrentCulture));    } }Output$234.66 $234.660

Here is our LinkedList.int [] num = {1, 3, 7, 15}; LinkedList list = new LinkedList(num);To check whether the list contains an element or not, use the Contains() method. The following example checks for node 3 in the list.list.Contains(3)Above, returns True since the element is found as shown below −Example Live Demousing System; using System.Collections.Generic; class Demo {    static void Main() {       int [] num = {1, 3, 7, 15};       LinkedList list = new LinkedList(num);       foreach (var n in list) {          Console.WriteLine(n);       }   ... Read More

The following is the array and its elements −int[] arr = { 10, 20, 15 };Set negative value to positive elements.if (arr[i] > 0) arr[i] = -arr[i];Loop the above until the length of the array.for (int i = 0; i < arr.Length; i++) {    Console.WriteLine(arr[i]);    if (arr[i] > 0)    arr[i] = -arr[i]; }Let us see the complete example.Example Live Demousing System; public class Demo {    public static void Main(string[] args) {       int[] arr = { 10, 20, 15 };       Console.WriteLine("Displaying elements...");       for (int i = 0; i < ... Read More

The "D" format specifier represents a custom date and time format string.The format string is defined by culture's DateTimeFormatInfo.LongDatePattern property.The custom format string is −dddd, dd MMMM yyyyExample Live Demousing System; using System.Globalization; class Demo {    static void Main() {       DateTime myDate = new DateTime(2018, 9, 20);       Console.WriteLine(myDate.ToString("D", CultureInfo.CreateSpecificCulture("en-US")));    } }OutputThursday, September 20, 2018

A % in a format string would multiply a number by 100 before it is formatted.The percent symbol is added in the number at the location where the % appears.For an example, declare and initialize a double variable.double d = .045;Now, use % custom specifier to multiply number by 100.d.ToString("#0.##%", CultureInfo.InvariantCulture)Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       double d = .045;       Console.WriteLine(d.ToString("#0.##%", CultureInfo.InvariantCulture));       Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:#0.##%}", d));    } }Output4.5% 4.5%

Clear a LinkedList using Clear() method.Let us first set a LinkedList.string [] employees = {"Patrick", "Robert", "John", "Jacob", "Jamie"}; LinkedList list = new LinkedList(employees);Now, let us clear the LinkedList.list.Clear();Let us see the complete code.Example Live Demousing System; using System.Collections.Generic; class Demo {    static void Main() {       string [] employees = {"Patrick", "Robert", "John", "Jacob", "Jamie"};       LinkedListlist = new LinkedList(employees);       foreach (var emp in list) {          Console.WriteLine(emp);       }       // clearing list       list.Clear();       Console.WriteLine("LinkedList after removing the ... Read More

The Parse method in Enum converts the string representation of the name or numeric value of enum constants to an equivalent enumerated object.The following is our enumeration.enum Vehicle { Car, Bus, Truck, Motobike };Now, use the GetNames() method in a loop to get the enum values. Parse them using the Enum.Parse() method as shown below −Enum.Parse(typeof(Vehicle)Example Live Demousing System; public class Demo {    enum Vehicle { Car, Bus, Truck, Motobike };    public static void Main() {       Console.WriteLine("The enumeration...");       foreach (string v in Enum.GetNames(typeof(Vehicle))) {          Console.WriteLine("{0} = {1:D}", v, Enum.Parse(typeof(Vehicle), ... Read More

The ToString() method converts the value of this instance to its equivalent string representation.Firstly, set an enum.enum Vehicle { Car, Bus, Truck, Motobike };To convert it to an equivalent string representation, use ToString().Vehicle.Car.ToString("d")Example Live Demousing System; public class Demo {    enum Vehicle { Car, Bus, Truck, Motobike };    public static void Main() {       Console.WriteLine("Vehicle.Car = {0}", Vehicle.Car.ToString("d"));       Console.WriteLine("Vehicle.Bus = {0}", Vehicle.Bus.ToString("d"));    } }OutputVehicle.Car = 0 Vehicle.Bus = 1