Get the difference between two arrays using the Except() method.The following are the two arrays.int[] arr = { 9, 12, 15, 20, 35, 40, 55, 67, 88, 92 }; int[] arr2 = { 20, 35 };To get the difference, use Except() method that returns the first list, except the elements in the second list.arr.AsQueryable().Except(arr2);The following is the entire example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Program {    static void Main() {       int[] arr = { 5, 10, 15, 20, 35, 40 };       int[] except = { 20, 35 };       ... Read More

FomatException is thrown when the format of an argument is invalid.Let us see an example.When we set a value other than int to int.Parse() method, then FormatException is thrown as shown below −Example Live Demousing System; class Demo {    static void Main() {       string str = "3.5";       int res = int.Parse(str);    } }The following error is thrown when the above program is compiled since we have passed a value other than integer.OutputUnhandled Exception: System.FormatException: Input string was not in a correct format.

To get the size of a 3D array in C#, use the GetLength() method with parameter as the index of the dimensions.GetLength(dimensionIndex)To get the size.arr.GetLength(0) arr.GetLength(1) arr.GetLength(2)Example Live Demousing System; class Program {    static void Main() {       int[,,] arr = new int[3,4,5];       // length of a dimension       Console.WriteLine(arr.GetLength(0));       Console.WriteLine(arr.GetLength(1));       Console.WriteLine(arr.GetLength(2));       // length       Console.WriteLine(arr.Length);    } }Output3 4 5 60

BinarySearch() works on a sorted list whether its numeric, alphanumeric or strings. It finds you the index of an element.Let’s say the following is our list.List list = new List(); list.Add(70); list.Add(150); list.Add(220); list.Add(250); list.Add(300);Now to check the index where 250 is placed, use BinarySearch() method.list.BinarySearch(250);Example Live Demousing System; using System.Collections.Generic; class Demo {    static void Main() {       List list = new List();       list.Add(70);       list.Add(150);       list.Add(220);       list.Add(250);       list.Add(300);       int value = list.BinarySearch(250);       Console.WriteLine("Element 250 at Index: "+value);    } }OutputElement 250 at Index: 3

The "." custom format specifier adds a localized decimal separator into the output string.The 1st period in the format string determines the location of the decimal separator in the formatted value.double d = 2.3; d.ToString("0.00", CultureInfo.InvariantCultureLet us see another example to learn how to implement “.” Custom specifier.Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       double d;       d = 3.7;       Console.WriteLine(d.ToString("0.00", CultureInfo.InvariantCulture));       Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:0.00}", d));       d = 5.89;       Console.WriteLine(d.ToString("00.00", CultureInfo.InvariantCulture));       Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:00.00}", d));    } }Output3.70 3.70 05.89 05.89

Firstly, set a Dictionary collection with elements.Dictionary d = new Dictionary() {    {1, "Applianes"},    {2, "Clothing"},    {3, "Toys"},    {4, "Footwear"},    {5, "Accessories"} };Now, let’s say you need to check whether key 5 exists or not. For that, use ContainsKey() method. It returns True if key is found.d.ContainsKey(5);Let us see the complete code.Example Live Demousing System; using System.Collections.Generic; public class Program {    public static void Main() {       Dictionary d = new Dictionary() {          {1, "Electronics"},          {2, "Clothing"},          {3, "Toys"},     ... Read More

The "#" custom format specifier works as a digit-placeholder symbol.If the value to be formatted has a digit in the position where the "#" symbol appears in the format string, then that digit is copied to the resultant string.We have set a double type here.double d; d = 4.2;Now, let us use the “#” custom specifier.d.ToString("#.##", CultureInfo.InvariantCulture)Here are other examples.Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       double d;       d = 4.2;       Console.WriteLine(d.ToString("#.##", CultureInfo.InvariantCulture));       Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:#.##}", d));       d = 345; ... Read More

The “0” custom specifier is a zero placeholder.If the value to be formatted has a digit in the position where the zero appears in the format string, the the digit is copied to the resultant string. However, if this doesn’t happen, then a zero appears.Here is our double variable.double d; d = 292;Now, by setting the following, you can easily make zero appear in the format string.d.ToString("00000")Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       double d;       d = 292;       Console.WriteLine(d.ToString("00000"));       Console.WriteLine(String.Format("{0:00000}", d));   ... Read More

To represent Int64 as a Binary string in C#, use the ToString() method and set the base as the ToString() method’s second parameter i.e.16 for Hexadecimal.Int64 represents a 64-bit signed integer.Firstly, set an Int64 variable.long val = 947645;Now, convert it to a hex string by including 16 as the second parameter.Convert.ToString(val, 16)ExampleLive Demousing System; class Demo {    static void Main() {       long val = 947645;       Console.WriteLine("Long: "+val);       Console.Write("Hex String: "+Convert.ToString(val, 16));    } }OutputLong: 947645 Hex String: e75bd

Int64 represents a 64-bit signed integer. To represent it as a string, use the ToString() method.Firstly, declare and initialize an Int64 variable.long val = 8766776;Now, represent it as a string.val.ToString()Let us see the complete example.Example Live Demousing System; class Demo {    static void Main() {       long val = 8766776;       Console.Write("Long converted to string = "+val.ToString());    } }OutputLong converted to string = 8766776