Let’s say we need to find the following file −E:ew.txtTo check the existence of the above file, use the Exists() method −if (File.Exists(@"E:ew.txt")) {    Console.WriteLine("File exists..."); }Here is the complete code to check the existence of a file −Example Live Demousing System; using System.IO; public class Demo {   ... Read More

Here, we are reading two different files −Reading text file −Example Live Demousing System; using System.IO; namespace FileApplication {    class Program {       static void Main(string[] args) {          try {             using (StreamReader sr = new StreamReader("d:/new.txt")) { ... Read More

Inheritance allows us to define a class in terms of another class, which makes it easier to create and maintain an application.When creating a class, instead of writing completely new data members and member functions, the programmer can designate that the new class should inherit the members of an existing ... Read More

Firstly, declare a tuple and add values −Tuple tuple = new Tuple(100, "Tom");With C#, to iterate over a tuple, you can go for individual elements −tuple.Item1 // first item tuple.Item2 // second item To display the complete tuple, just use: // display entire tuple Console.WriteLine(tuple);Let us see the complete ... Read More

An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type stored at contiguous memory locations.Multi-dimensional arrays are also called rectangular array. Multidimensional arrays are initialized by specifying bracketed values for ... Read More

To insert an item in an already created List, use the Insert() method.Firstly, set elements −List list = new List(); list.Add(989); list.Add(345); list.Add(654); list.Add(876); list.Add(234); list.Add(909);Now, let’s say you need to insert an item at 4th position. For that, use the Insert() method −// inserting element at 4th position ... Read More

The current MySQL transaction will be committed and ended when any of the DDL statement such as CREATE or DROP databases, Create, ALTER or DROP tables or stored routines is executed in the middle of the current transaction. All the database changes made in the current transaction will be made ... Read More

A list is a Generic collection to hold elements of same datatypes.To clone a list, you can use the CopyTo method.Declare a list and add elements −List < string > myList = new List < string > (); myList.Add("Programming"); myList.Add("Web Dev"); myList.Add("Database");Now create a new array and clone the list ... Read More

Set the two dictionaries −Dictionary < string, int > dict1 = new Dictionary < string, int > (); dict1.Add("laptop", 1); dict1.Add("desktop", 2); Dictionary < string, int > dict2 = new Dictionary < string, int > (); dict2.Add("desktop", 3); dict2.Add("tablet", 4); dict2.Add("mobile", 5);Now use HashSet and UnionWith() method to merge the ... Read More

Synchronize access to resources in multithreaded applications using Synchronization.Mutex to Synchronize ThreadsA mutex can be used to synchronize threads across processes. Use it to prevent the simultaneous execution of a block of code by more than one thread at a time.C# lock statement is used to ensure that a block ... Read More