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Articles by karthikeya Boyini
Page 13 of 142
Date format validation using C# Regex
Date format validation in C# ensures that user input matches the expected date format before processing. The most reliable approach is using the DateTime.TryParseExact method, which validates both the format and the actual date values. For more complex pattern matching, Regular Expressions (Regex) can also be used. Syntax Following is the syntax for DateTime.TryParseExact method − bool DateTime.TryParseExact(string s, string format, IFormatProvider provider, DateTimeStyles style, out DateTime result) Following is the syntax for Regex date validation − Regex regex = new Regex(@"pattern"); bool isMatch = regex.IsMatch(dateString); ...
Read MoreC# Program to convert integer array to string array
Converting an integer array to a string array is a common task in C# programming. The most efficient approach is using the Array.ConvertAll() method, which applies a conversion function to each element in the source array and returns a new array of the target type. Syntax Following is the syntax for Array.ConvertAll() method − string[] result = Array.ConvertAll(sourceArray, converter); Parameters sourceArray − The source integer array to convert converter − A lambda expression or method that converts each element Return Value Returns a new string ...
Read MorePriority Queues with C#
A priority queue is a data structure that stores elements with associated priority values. It is an extension of a regular queue where elements are served based on their priority rather than their insertion order. When you remove an item from a priority queue, the element with the highest priority is removed first. If two elements have the same priority, they are typically served in the order they were inserted. Syntax Following is the basic syntax for creating a priority queue class − public class MyPriorityQueue where T : IComparable { private ...
Read MoreC# program to merge two sorted arrays into one
Merging two sorted arrays in C# involves combining the elements of both arrays into a single array while maintaining the sorted order. This is a fundamental operation used in algorithms like merge sort and when combining datasets. Approaches to Merge Sorted Arrays There are two main approaches to merge sorted arrays − Simple Concatenation: Append all elements from both arrays and then sort the result. Merge Algorithm: Compare elements from both arrays and merge them in sorted order without additional sorting. Using Simple Concatenation The simplest approach is to ...
Read MoreClear a list in C#
To clear a list in C#, you use the Clear() method which removes all elements from the list. This method is part of the List class and provides an efficient way to empty a list without recreating it. Syntax Following is the syntax for the Clear()
Read MoreC# Program to remove a node at the end of the Linked List
In C#, you can remove the last node from a LinkedList using the RemoveLast() method. This method removes and returns the last node in the linked list, making it an efficient way to delete the tail element. Syntax Following is the syntax for removing the last node from a LinkedList − linkedList.RemoveLast(); The RemoveLast() method removes the last node and has no return value. If the list is empty, it throws an InvalidOperationException. How It Works The LinkedList class maintains references to both the first and last nodes. When RemoveLast() is called, ...
Read MoreHow to write the first program in C#?
Writing your first program in C# is the foundation of learning this powerful programming language. A C# program consists of several key components that work together to produce output. Let's explore the structure and elements of a basic C# program. Syntax Following is the basic structure of a C# program − using System; namespace NamespaceName { class ClassName { static void Main(string[] args) { // Program logic here ...
Read MoreFlow control in try catch finally in C#
The flow control in try-catch-finally blocks in C# follows a specific execution order depending on whether exceptions occur. Understanding this flow is crucial for proper error handling and resource management in your applications. Syntax Following is the syntax for try-catch-finally blocks − try { // Code that may throw an exception } catch (ExceptionType e) { // Exception handling code } finally { // Code that always executes } Flow Control Rules The try block executes first and contains code that might ...
Read MoreC# program to find the index of an element in a List
In C#, you can find the index of an element in a List using the IndexOf() method. This method returns the zero-based index of the first occurrence of the specified element, or -1 if the element is not found. Syntax Following is the syntax for the IndexOf() method − int IndexOf(T item) int IndexOf(T item, int startIndex) int IndexOf(T item, int startIndex, int count) Parameters item: The element to locate in the list. startIndex: The zero-based starting index of the search (optional). count: The number of elements to search (optional). ...
Read MoreHow to declare and initialize a dictionary in C#?
A Dictionary in C# is a collection that stores key-value pairs, where each key must be unique. It is part of the System.Collections.Generic namespace and provides fast lookups based on keys. Syntax Following is the syntax for declaring and initializing a Dictionary − Dictionary dictionaryName = new Dictionary(); Where TKey is the type of the key and TValue is the type of the value. You can also use the interface type for more flexibility − IDictionary dictionaryName = new Dictionary(); Using Dictionary.Add() Method The Add() method allows you ...
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