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A List in C# is a dynamic collection that can grow or shrink in size. To determine the size of a list, you can use two different properties: Count (for the number of actual elements) and Capacity (for the total allocated space). Syntax To get the number of elements in a list − listName.Count To get the total capacity (allocated space) of a list − listName.Capacity Understanding Count vs Capacity Count vs Capacity Count Number of actual ... Read More
The StreamReader class in C# is used to read text files efficiently. It provides methods to read characters, lines, or the entire content of a text file. StreamReader is part of the System.IO namespace and implements IDisposable, making it suitable for use with using statements for automatic resource cleanup. Syntax Following is the syntax to create a StreamReader object − StreamReader sr = new StreamReader("filename.txt"); Following is the syntax to use StreamReader with automatic disposal − using (StreamReader sr = new StreamReader("filename.txt")) { // read operations } ... Read More
The TimeSpan.Seconds property returns only the seconds component of a time span, whereas TimeSpan.TotalSeconds property converts the entire time duration into seconds. Understanding this difference is crucial when working with time calculations in C#. Syntax Following is the syntax for accessing the seconds component − TimeSpan ts = new TimeSpan(days, hours, minutes, seconds, milliseconds); int seconds = ts.Seconds; Following is the syntax for getting total seconds − TimeSpan ts = new TimeSpan(days, hours, minutes, seconds, milliseconds); double totalSeconds = ts.TotalSeconds; How It Works TimeSpan: 1 ... Read More
The Uri.MakeRelativeUri(Uri) method in C# is used to determine the relative difference between two Uri instances. It returns a relative URI that, when resolved against the base URI, yields the target URI. Syntax Following is the syntax − public Uri MakeRelativeUri(Uri uri); Parameters uri − The URI to compare to the current URI instance. This represents the target URI for which you want to create a relative path. Return Value Returns a Uri object that represents the relative URI from the current instance to the specified URI. ... Read More
A palindrome is a number or string that reads the same forward and backward. In C#, we can check if a number is a palindrome by reversing its digits and comparing it with the original number. Syntax Following is the syntax for reversing a string using Array.Reverse() method − char[] charArray = string.ToCharArray(); Array.Reverse(charArray); string reversedString = new string(charArray); Following is the syntax for comparing strings ignoring case − bool isEqual = string1.Equals(string2, StringComparison.OrdinalIgnoreCase); Using String Reversal Method The most straightforward approach is to convert the number to a ... Read More
The FileNotFoundException is thrown when you try to access a file that does not exist on the system. This commonly occurs when using classes like StreamReader, File.ReadAllText(), or other file I/O operations with an incorrect file path. Syntax Following is the syntax for handling FileNotFoundException using try-catch − try { // File operation that might throw FileNotFoundException } catch (FileNotFoundException ex) { // Handle the exception Console.WriteLine("File not found: " + ex.Message); } Using StreamReader with Exception Handling When using StreamReader to read a ... Read More
Finding the most frequent element in a string is a common programming problem that involves counting the occurrences of each character and determining which appears most often. In C#, this can be efficiently solved using an array to track character frequencies. Syntax Following is the basic approach to count character frequencies − int[] frequency = new int[256]; // ASCII character set for (int i = 0; i < str.Length; i++) { frequency[str[i]]++; } Using Array-Based Frequency Counting The most straightforward approach uses an integer array where each index corresponds ... Read More
The Convert.ToChar() method in C# converts a specified value to its equivalent Unicode character representation. This method accepts various data types including integers, bytes, strings, and other numeric types, and returns a char value. Syntax Following are the common overloads of the Convert.ToChar() method − public static char ToChar(byte value) public static char ToChar(int value) public static char ToChar(string value) public static char ToChar(object value) Parameters value − The value to be converted to a Unicode character. This can be a numeric type, string, or object. Return Value ... Read More
The Uri.ToString() method in C# is used to get a canonical string representation for the specified Uri instance. This method returns the complete URI as a formatted string, including all components such as scheme, host, path, query, and fragment. Syntax Following is the syntax − public override string ToString(); Return Value This method returns a string that contains the unescaped canonical representation of the Uri instance. All characters are unescaped except #, ?, and %. Using Uri.ToString() Method Basic Example Let us see how to use the Uri.ToString() method to ... Read More
Factorial of a number is the product of all positive integers less than or equal to that number. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. We can calculate factorial using recursion, where a function calls itself with a smaller value until it reaches the base case. Syntax Following is the syntax for a recursive factorial function − public int Factorial(int n) { if (n == 0 || n == 1) return 1; else ... Read More