Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Use the Take() method to get the first individual number of elements in C#.Firstly, set a list and add elements −List myList = new List(); myList.Add("One"); myList.Add("Two"); myList.Add("Three"); myList.Add("Four"); myList.Add("Five"); myList.Add("Six");Now, use the Take() method to get the elements from the list. Add the number of the elements you want as an argument −myList.Take(3)Here is the code −Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo { public static void Main() { List myList = new List(); myList.Add("One"); myList.Add("Two"); myList.Add("Three"); myList.Add("Four"); ... Read More
JavaScript uses try…catch…finally to handle exceptions. The latest versions of JavaScript added exception-handling capabilities. JavaScript implements the try...catch...finally construct as well as the throw operator to handle exceptions.You can catch programmer-generated and runtime exceptions, but you cannot catch JavaScript syntax errors.SyntaxHere is the try...catch...finally block syntax − ExampleYou can try to run the following code to learn how exceptions are handled in JavaScript − Click the following to see the result:
Use the ContainsValue() method in C# to search for a value in a Dictionary.Create a Dictionary and add elements −Dictionary d = new Dictionary(); d.Add("keyboard", "One"); d.Add("mouse", "Two");Now, use the ContainsValue() method to find a particular value −d.ContainsValue("Two");The following is the complete code −Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Program { static void Main() { Dictionary d = new Dictionary(); d.Add("keyboard", "One"); d.Add("mouse", "Two"); // search for a value Console.WriteLine(d.ContainsValue("Two")); } }OutputTrue
Firstly, set the Dictionaries to be combined −Dictionary dict1 = new Dictionary (); dict1.Add("one", 1); dict1.Add("Two", 2); Dictionary dict2 = new Dictionary (); dict2.Add("Three", 3); dict2.Add("Four", 4);Now, use HashSet to combine them. The method used for the same purpose is UnionWith() −HashSet hSet = new HashSet (dict1.Keys); hSet.UnionWith(dict2.Keys);The following is the complete code −Example Live Demousing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary dict1 = new Dictionary (); dict1.Add("one", 1); dict1.Add("Two", 2); Dictionary ... Read More
You can try to run the following code to implement :focus pseudo-classExampleLive Demo input:focus { background-color: orange; } Subject Student: Age: Output
To compare, ignoring case, use the case-insensitive Dictionary.While declaring a Dictionary, set the following property to get case-insensitive Dictionary −StringComparer.OrdinalIgnoreCaseAdd the property like this −Dictionary dict = new Dictionary (StringComparer.OrdinalIgnoreCase);Here is the complete code −Example Live Demousing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary dict = new Dictionary (StringComparer.OrdinalIgnoreCase); dict.Add("cricket", 1); dict.Add("football", 2); foreach (var val in dict) { Console.WriteLine(val.ToString()); } // case insensitive dictionary i.e. "cricket" is equal to "CRICKET" Console.WriteLine(dict["cricket"]); Console.WriteLine(dict["CRICKET"]); } }Output[cricket, 1] [football, 2] 1 1
Firstly, create a file using StreamWriter class and add content to it −using (StreamWriter sw = new StreamWriter("hello.txt")) { sw.WriteLine("This is demo line 1"); sw.WriteLine("This is demo line 2"); sw.WriteLine("This is demo line 3"); }Now use the ReadAllLines() method to read all the lines. With that, the Length property is to be used to get the count of lines −int count = File.ReadAllLines("hello.txt").Length;Here is the complete code −Example Live Demousing System; using System.Collections.Generic; using System.IO; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("hello.txt")) { ... Read More
Use WriteAllLines method to write an array to a file.Firstly, set a string array −string[] stringArray = new string[] { "one", "two", "three" };Now, use the WriteAllLines method to add the above array to a file −File.WriteAllLines("new.txt", stringArray);Here is the complete code −Example Live Demousing System.IO; using System; public class Program { public static void Main() { string[] stringArray = new string[] { "one", "two", "three" }; File.WriteAllLines("new.txt", stringArray); using (StreamReader sr = new StreamReader("new.txt")) { string res = sr.ReadToEnd(); Console.WriteLine(res); } } }Outputone two three
It is quite possible to add multiple stored generated columns in a MySQL table. It can be illustrated with the following example as follows −Examplemysql> Create table profit1(cost int, price int, profit int AS (price-cost) STORED, price_revised int AS (price-2) STORED); Query OK, 0 rows affected (0.36 sec) mysql> Describe profit1; +---------------+---------+------+-----+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +---------------+---------+------+-----+---------+------------------+ | cost | int(11) | YES | | NULL | ... Read More
Use the Directory. Exists method to check whether a directory exists or not.Let’s say you need to check whether the following directory exists or not −C:\AmitFor that, use the Exists() method −if (Directory.Exists("C:\Amit")) { Console.WriteLine("Directory Amit Exist!"); }The following is the complete code −Example Live Demousing System.IO; using System; public class Program { public static void Main() { if (Directory.Exists("C:\Amit")) { Console.WriteLine("Directory Amit Exist!"); } else { Console.WriteLine("Directory Amit does not exist!"); } } }OutputDirectory Amit does not exist!