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Articles by karthikeya Boyini
Page 16 of 142
Abstract vs Sealed Classes vs Class Members in C#
The abstract class includes abstract and non-abstract methods. You cannot instantiate an abstract class directly. The sealed class prevents inheritance and you cannot use it as a base class. Both abstract and sealed classes can contain various types of class members with different access modifiers and behaviors. Abstract Classes To declare an abstract class, you need to place the keyword abstract before the class definition. An abstract class can contain abstract methods that must be implemented by derived classes − Syntax public abstract class ClassName { public abstract void MethodName(); ...
Read MoreContainsKey() method in C#
The ContainsKey() method in C# is used to check whether a specific key exists in a Hashtable or other collection types like Dictionary. This method returns true if the key is found, otherwise it returns false. Syntax Following is the syntax for the ContainsKey() method − bool ContainsKey(object key) Parameters key − The key to locate in the collection. Return Value Returns true if the key exists in the collection; otherwise, false. ContainsKey() Method Logic Hashtable ...
Read MoreTimer in C#
The System.Timers.Timer class in C# generates events at specified intervals. It is useful for executing code periodically, such as updating displays, checking status, or performing background tasks. The timer can be configured to fire once or repeatedly, and provides precise control over timing intervals and event handling. Syntax Following is the syntax for creating and configuring a timer − Timer timer = new System.Timers.Timer(intervalInMilliseconds); timer.Elapsed += EventHandlerMethod; timer.Enabled = true; Following is the syntax for the event handler method − private static void EventHandlerMethod(Object source, ElapsedEventArgs e) { ...
Read MoreC# Program to get distinct element from a sequence
The Distinct() method in C# is used to remove duplicate elements from a sequence and return only unique values. This method is part of LINQ (Language Integrated Query) and works with any collection that implements IEnumerable. Syntax Following is the syntax for the Distinct() method − IEnumerable Distinct() IEnumerable Distinct(IEqualityComparer comparer) Parameters comparer (optional) − An IEqualityComparer to compare values for equality. If not provided, the default equality comparer is used. Return Value Returns an IEnumerable containing distinct elements from the source sequence. Using Distinct() with ...
Read MoreBackground and foreground thread in C#
A thread is defined as the execution path of a program. Each thread defines a unique flow of control. In C#, threads are classified as either foreground threads or background threads based on their behavior when the main application terminates. The key difference is that foreground threads keep the application alive, while background threads are automatically terminated when all foreground threads finish execution. Thread Types Comparison Foreground Thread Background Thread Keeps the application running until it completes Terminated automatically when all foreground threads end Default thread type (IsBackground ...
Read MoreHow to use sizeof() operator to find the size of a data type or a variable in C#
The sizeof operator in C# returns the size of a data type in bytes. It can only be used with value types and is particularly useful when working with unmanaged code or memory allocation scenarios. Syntax Following is the syntax for using the sizeof operator − sizeof(datatype) For example, to find the size of an int data type − sizeof(int); Key Rules The sizeof operator can only be used with value types, not reference types. It returns the size in bytes. For built-in ...
Read MoreStatic vs. Non-Static method in C#
In C#, methods can be declared as either static or non-static (instance methods). Static methods belong to the class itself and can be called without creating an instance of the class, while non-static methods belong to specific instances of the class. Static methods can only access static variables and other static members directly. They exist even before any object of the class is created and are shared across all instances of the class. Syntax Following is the syntax for declaring a static method − public static returnType MethodName() { // method ...
Read MoreBasic calculator program using C#
A calculator program in C# can be built using either Windows Forms or Console applications. This tutorial demonstrates how to create a basic calculator that performs fundamental arithmetic operations like addition, subtraction, multiplication, and division. We'll create a complete console-based calculator that takes user input and performs calculations, making it easy to understand the core logic before moving to GUI implementations. Console-Based Calculator Basic Calculator with Menu using System; class Calculator { public static void Main(string[] args) { double num1, num2, result; ...
Read MoreC# Linq Intersect Method
The Intersect() method in C# LINQ is used to find common elements between two collections. It returns a new sequence containing elements that exist in both the source collection and the specified collection, with duplicates automatically removed. Syntax Following is the syntax for the Intersect() method − public static IEnumerable Intersect( this IEnumerable first, IEnumerable second ) With a custom equality comparer − public static IEnumerable Intersect( this IEnumerable first, IEnumerable second, ...
Read MoreWhat is the Capacity property of an ArrayList class in C#?
The Capacity property in the ArrayList class gets or sets the number of elements that the ArrayList can contain. This property represents the internal array size, which is automatically managed by the ArrayList to optimize performance. The capacity is always greater than or equal to the count of elements. When elements are added and the capacity is exceeded, the ArrayList automatically doubles its capacity to accommodate more elements. Syntax Following is the syntax for accessing the Capacity property − arrayListName.Capacity You can also set the capacity explicitly − arrayListName.Capacity = newCapacityValue; ...
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