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

The "D" (or decimal) format specifier works for integer type. It converts a number to a string of decimal digits (0-9).Let’say the following is our number.int val = 467;Now to return the result as 0467, use the following decimal format specifier.val.ToString("D4")Let us see another example.Example Live Demousing System; using System.Globalization; class Demo {    static void Main() {       int val;       val = 877;       Console.WriteLine(val.ToString("D"));       Console.WriteLine(val.ToString("D4"));       Console.WriteLine(val.ToString("D8"));    } }Output877 0877 00000877

OverflowException is thrown when the parameter value is out of integer ranges.Let us see an example.When we set a value to int.Parse() method that is out of integer range, then OverflowException is thrown as shown below −Example Live Demousing System; class Demo {    static void Main() {       string str = "757657657657657";       int res = int.Parse(str);    } }OutputThe following error is thrown when the above program is compiled since we have passed a value that is out of integer (Int32) range.Unhandled Exception: System.OverflowException: Value was either too large or too small for an Int32.

To get the Upperbound and Lowerbound, use the GetUpperBound() GetLowerBound() methods in C#, respectively.The parameter to be set under these methods is the dimensions i.e.Let’s say our 3D array is −int[, , ] arr = new int[2, 3, 4];For a three-dimensional arrays, dimension 0.arr.GetUpperBound(0) arr.GetLowerBound(0)For a three-dimensional arrays, dimension 1.arr.GetUpperBound(1) arr.GetLowerBound(1)For a three-dimensional arrays, dimension 2.arr.GetUpperBound(2) arr.GetLowerBound(2)Example Live Demousing System; class Program {    static void Main() {       int[, , ] arr = new int[2, 3, 4];       Console.WriteLine("Dimension 0 Upper Bound: {0}", arr.GetUpperBound(0).ToString());       Console.WriteLine("Dimension 0 Lower Bound: {0}", arr.GetLowerBound(0).ToString());       ... Read More

This method is used to handle empty collections. Instead of showing an error, this method displays a default value.We have the following list.List myList = new List();As you can see, since the above list is empty, we can display the default value.var res = myList.DefaultIfEmpty();Let us see an example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       List myList = new List();       var res = myList.DefaultIfEmpty();       foreach (var a in res) {          Console.WriteLine(a);       }    } }Output0

The Count method returns the count of elements in a sequence.Let us first set an array.string[] arr = { "Java", "C++", "Python"};Now, use the Count() method to count the array elements.arr.AsQueryable().Count();The following is the complete example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       string[] arr = { "Java", "C++", "Python"};       int arr_count = arr.AsQueryable().Count();       Console.WriteLine("Count of arrays: {0}", arr_count);    } }OutputCount of arrays: 3

Use Linq Contains() method to search for as specific string in an array of strings.string[] arr = { "Bag", "Pen", "Pencil"};Now, add the string in a string variable i.e. the string you want to search.string str = "Pen";Use the Contains() method to search the above string.arr.AsQueryable().Contains(str);Let us see the entire example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Demo {    static void Main() {       string[] arr = { "Bag", "Pen", "Pencil"};       string str = "Pen";       bool res = arr.AsQueryable().Contains(str);       Console.WriteLine("String Pen is in the array? "+res);   ... Read More