Csharp Articles - Page 128 of 196

To represent Int632as a Binary string in C#, use the ToString() method and set the base as the ToString() method’s second parameter i.e. 2 for Binary.Int32 represents a 32-bit signed integer.Firstly, set an Int64 variable −int val = 30;Now, convert it to a binary string by including 2 as the second parameter.Convert.ToString(val, 2)Example Live Demousing System; class Demo {    static void Main() {       int val = 30;       Console.WriteLine("Integer: "+val);       Console.Write("Binary String: "+Convert.ToString(val, 2));    } }OutputInteger: 30 Binary String: 11110

Drive information of an Operating System includes.Drive Name Volume Label Free Space Total Size Drive Format Drive TypeTo get above information about a drive, try to run the following code −Exampleusing System.IO; using System; class Program {    static void Main() {       DriveInfo driveInfo = new DriveInfo("D");       Console.WriteLine(driveInfo.Name);       Console.WriteLine(driveInfo.VolumeLabel);       Console.WriteLine(driveInfo.AvailableFreeSpace);       Console.WriteLine(driveInfo.TotalFreeSpace);       Console.WriteLine(driveInfo.TotalSize);       Console.WriteLine(driveInfo.DriveFormat);       Console.WriteLine(driveInfo.DriveType);    } }OutputThe following is the output −D: NTFS 76767677788 76767677788 45463434799 NTFS FixedNote − The output may vary with different Operating Systems.

Let’s say the following is the string −StringBuilder str = new StringBuilder("Patience is key!");To remove whitespace, you can use the replace method.str.Replace(" ", "");Let us see the complete code.Example Live Demousing System; using System.Text; class Demo {    static void Main() {       // Initial String       StringBuilder str = new StringBuilder("Patience is key!");       Console.WriteLine(str.ToString());       // Replace       str.Replace(" ", "");       // New String       Console.WriteLine(str.ToString());       Console.ReadLine();    } }OutputPatience is key! Patienceiskey!

To handle File Paths in C#, use the Path methods. These methods come under System.IO Namespace.Some of them are −GetExtensionRetrieve the extension of the file using the GetExtension() method.For example, .txt, .dat, etc.GetFileNameRetrieve the name of the file using the GetFileName() method.For example, new.txt, details.dat, etc.GetFileNameWithoutExtensionRetrieve the name of the file without extension using the GetFileNameWithoutExtension() method.For example, new, details, etc.Let us see an example −Example Live Demousing System.IO; using System; class Program {    static void Main() {       string myPath = "D:\one.txt";       string fileExtension = Path.GetExtension(myPath);       string fileName = Path.GetFileName(myPath);   ... Read More

Set an array.int[] array = new int[] { 50, 100, 150, 200, 250, 300, 350, 400 };Now, if you will print this array using a loop and new line, then the arrays will be visible vertically.To work it horizontally, use the Join() method and set spaces to separate array elements.string.Join(" ", array)Let us see the complete code.Example Live Demousing System; using System.Linq; using System.IO; class Program {    static void Main() {       int[] array = new int[] { 50, 100, 150, 200, 250, 300, 350, 400 };       Console.WriteLine(string.Join(" ", array));    } }Output50 100 150 200 250 300 350 400

Firstly, set a list and add elements.List myList = new List(); myList.Add("Jennings"); myList.Add("James"); myList.Add("Chris");Let’s say you need to delete the element “James” now. For that, use the Remove() method.myList.Remove("James");Here is the complete code.Example Live Demousing System.Collections.Generic; using System; class Program {    static void Main() {       List myList = new List();       myList.Add("Jennings");       myList.Add("James");       myList.Add("Chris");       Console.WriteLine("Initial List...");       foreach(string str in myList) {          Console.WriteLine(str);       }       myList.Remove("James");       Console.WriteLine("New List...");     ... Read More

If a directory you are trying to find does not exist, then DirectoryNotFoundException occurs.Here, we are try to find a directory that does not exist using GetDirectories() method.Exampleusing System.IO; using System; class Program {    static void Main() {       Directory.GetDirectories("D:ew\");    } }The above code will generate the following exception since the directory “D:ew” does not exist.Unhandled Exception: System.IO.DirectoryNotFoundException: Could not find a part of the path

The following is our string −string myStr = "5";To check whether the above is a string with numeric representation, use TryParse and out.int.TryParse(myStr, out a);Here is the complete code.Example Live Demousing System.IO; using System; class Program {    static void Main() {       bool res;       int a;       string myStr = "5";       // checking for valid string representation of a number       res = int.TryParse(myStr, out a);       Console.WriteLine(res);    } }OutputTrue

To validate, you need to check for the protocols.http httpsWith that, you need to check for .com, .in, .org, etc.For this, use the following regular expression −(http|http(s)?://)?([\w-]+\.)+[\w-]+[.com|.in|.org]+(\[\?%&=]*)?The following is the code −Example Live Demousing System; using System.Text.RegularExpressions; namespace RegExApplication {    class Program {       private static void showMatch(string text, string expr) {          Console.WriteLine("The Expression: " + expr);          MatchCollection mc = Regex.Matches(text, expr);          foreach (Match m in mc) {             Console.WriteLine(m);          }       }     ... Read More

Use Hashset to remove duplicate characters.Here is the string −string myStr = "kkllmmnnoo";Now, use HashSet to map the string to char. This will remove the duplicate characters from a string.var unique = new HashSet(myStr);Let us see the complete example −Example Live Demousing System; using System.Linq; using System.Collections.Generic; namespace Demo {    class Program {       static void Main(string[] args) {          string myStr = "kkllmmnnoo";          Console.WriteLine("Initial String: "+myStr);          var unique = new HashSet(myStr);          Console.Write("New String after removing duplicates: ");          foreach (char c in unique)          Console.Write(c);       }    } }OutputInitial String: kkllmmnnoo New String after removing duplicates: klmno