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Convert a string representation of number to an integer, using the int.TryParse and intParse method in C#.If the string cannot be converted, then the int.TryParse method returns false i.e. a Boolean value, whereas int.Parse returns an exception.Let us see an example of int.Parse method −Example Live Demousing System.IO; using System; class Program { static void Main() { int res; string myStr = "120"; res = int.Parse(myStr); Console.WriteLine("String is a numeric representation: "+res); } }OutputString is a numeric representation: 120Let us see an example of int.TryParse method.Example Live Demousing ... Read More
Firstly, set a string.StringBuilder str = new StringBuilder();Use Random.Random random = new Random((int)DateTime.Now.Ticks);Now loop through a number which is the length of the random string you want.for (int i = 0; i < 4; i++) { c = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65))); str.Append(c); }On every iteration above, a random character is generated and appended to form a string.The following is the complete example −Example Live Demousing System.Text; using System; class Program { static void Main() { StringBuilder str = new StringBuilder(); char c; Random random = new Random((int)DateTime.Now.Ticks); ... Read More
# Get data from fields from HTML page first_name = form.getvalue('first_name') last_name = form.getvalue('last_name') send data to Browser print("Content-type:text/html") print print("") print("") print("Hello - Second CGI Program") print("") print("") print(" Hello %s %s " % (first_name, last_name)) print("") print("")
Hashtable class represents a collection of key-and-value pairs that are organized based on the hash code of the key. It uses the key to access the elements in the collection.Dictionary is a collection of keys and values in C#. Dictionary is included in the System.Collection.Generics namespace.Hashtable is slower than Dictionary. For strongly-typed collections, the Dictionary collection is faster.Let’s say we need to find a key from Hashtable collections. With that, we are also finding a key from Dictionary collection as well. In that case, Dictionary would be faster for the same statement −For HashTablehashtable.ContainsKey("12345");For Dictionarydictionary.ContainsKey("12345") Read More
With C# 7, you can easily create a ValueType with names.Note − Add System.ValueTuple package to run ValueTuple program.Let’s see how to add it −Go to your projectRight click on the project in the solution explorerSelect “Manage NuGet Packages”You will reach the NuGet Package Manager.Now, click the Browse tab and find “ValueTuple”Finally, add System.ValueTuple packageExampleusing System; class Program { static void Main() { var myTuple = (marks: 95, name: "jack", subject: "maths"); //Add System.ValueTuple package to run this program // using names to access Console.WriteLine("Student Marks: "+myTuple.marks); ... Read More
It lets you specify a block of code that you can expand or collapse when using the outlining feature of the Visual Studio Code Editor. It should be terminated with #endregion.Let us see how to define a region using #region.#region NewClass definition public class NewClass { static void Main() { } } #endregionThe following is an example showing the usage of #region directive.Example Live Demousing System; #region class MyClass { } #endregion class Demo { #region VARIABLE int a; #endregion static void Main() { #region BODY Console.WriteLine("Example showing the usage of region directive!"); #endregion } }OutputExample showing the usage of region directive!
Use operator + to concatenate two or more string objects.Set the first string object.char[] c1 = { 'H', 'e', 'n', 'r', 'y' }; string str1 = new string(c1);Now, set the second string object.char[] c2 = { 'J', 'a', 'c', 'k' }; string str2 = new string(c2);Now display the concatenated strings using + operator.Example Live Demousing System.Text; using System; class Program { static void Main() { char[] c1 = { 'H', 'e', 'n', 'r', 'y' }; string str1 = new string(c1); char[] c2 = { 'J', 'a', 'c', 'k' }; string str2 = new string(c2); Console.WriteLine("Welcome " + str1 + " and " + str2 + "!"); } }OutputWelcome Henry and Jack!
Set a list.List myList = new List(){1, 2, 3, 5, 8, 9};Now, get the first and last elements −int a = myList.OrderBy(x => x).First(); int b = myList.OrderBy(x => x).Last();In a new list, get all the elements and use the Except to get the missing numbers −List myList2 = Enumerable.Range(a, b - a + 1).ToList(); List remaining = myList2.Except(myList).ToList();Let us see the complete code −Example Live Demousing System.Collections.Generic; using System; using System.Linq; public class Program { public static void Main() { List myList = new List(){1, 2, 3, 5, 8, 9}; Console.WriteLine("Numbers... "); ... Read More
Use the CSS :last-child selector to style every elements that is the last child of its parent. You can try to run the following code to implement the :last-child selectorLive Demo p:last-child { background: orange; } This is demo text1. This is demo text2. This is demo text3.
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