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Create a .NET console application using command line

We don’t deal with .NET framework, or .NET Core anymore. We call it ‘.NET’. As of writing this blog, the latest version available is .NET 5. And, these steps works in previous versions of .NET Core also.

Assuming you have downloaded the latest version of .NET.

Step 1:Open command prompt

Step 2: Type: dotnet new console -name “HelloWorld“

You must see a new folder named “HelloWorld” crated with a directory structure like this:

You can open Program.cs to see its contents. It has a very basic program to display “Hello World!” message.

Step 3: Your .NET console application is ready. First, you have to build it

Type command: dotnet build “HelloWorld”

You can see HelloWorld.exe file is created, in addition to some other files in your folder \HelloWorld\bin\Debug\net5.0

Step 4: Run!

You can simply run the exe file directly going to the location, or by typing this command:

Type command:

Step 5: Alternate way to run the program

Go inside your program folder, i.e., “HelloWorld“, then type command:

dotnet run HelloWorld

or simply, dotnet run

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JavaScript Notification API for beginners

Just two steps:

  1. Ask user the permission to send notifications

Notification.requestPermission();

2. Create/send notifiation

notificaiton = new Notification (‘This is a notification’);     

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Dapr: The distributed application runtime is now production ready

Dapr - Distributed Application Runtime

Simplify cloud-native application development. Focus on your application’s core logic and keep your code simple and portable

Dapr is an open source, portable, event-driven runtime that makes it easy for developers to build resilient, microservice, stateless and stateful applications that run on the cloud and edge. Dapr enables developers to focus on writing business logic and not solving distributed system challenges, thereby significantly improving their productivity, and reducing development time.

Read more: https://blog.dapr.io/posts/2021/02/17/announcing-dapr-v1.0/
Dapr Home: https://dapr.io/

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Why .NET 5.0 and not .NET Core 5.0? And, where is .NET (core) 4.0?

Note the point…

.NET 5.0 is the next major release of .NET Core following 3.1. We named this new release .NET 5.0 instead of .NET Core 4.0 for two reasons:

  • We skipped version numbers 4.x to avoid confusion with .NET Framework 4.x.
  • We dropped “Core” from the name to emphasize that this is the main implementation of .NET going forward. .NET 5.0 supports more types of apps and more platforms than .NET Core or .NET Framework.

ASP.NET Core 5.0 is based on .NET 5.0 but retains the name “Core” to avoid confusing it with ASP.NET MVC 5. Likewise, Entity Framework Core 5.0 retains the name “Core” to avoid confusing it with Entity Framework 5 and 6.

Ref: https://docs.microsoft.com/en-us/dotnet/core/dotnet-five

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Strong Password Generator in C#

This code snippets will let you auto-generate strong passwords. Look for the password rules in the inline comments in code

001 using System;
002 using System.Collections.Generic;
003 using System.Linq;
004 using System.Security.Cryptography.X509Certificates;
005 using System.Text;
006 using System.Threading.Tasks;
007
008 namespace PwdGen
009 {
010     class Program
011     {
012         static void Main(string[] args)
013         {
014             //Console.WriteLine(GeneratePassword2(8, 15));
015             //Console.WriteLine(GeneratePassword(8, 15));
016             Console.ReadKey();
017         }
018
019         static string GeneratePassword2(int MinLength, int MaxLength)
020         {
021
022             string ValidChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ:;<>|=.,_-~!?&%@#$£€°^*§()+[] ";
023             string SpecialChars = "!@#$%^&*()";
024             
025             string pwd = string.Empty;
026
027             do
028             {
029                 Random rnd = new Random(Guid.NewGuid().GetHashCode());
030                 pwd = string.Join(string.Empty, Enumerable.Repeat(ValidChars, rnd.Next(MinLength, MaxLength + 1)).Select(s => s[rnd.Next(s.Length)]).ToArray());
031                 Console.WriteLine(pwd);
032             } while (
033
034                 Regex.Match(pwd, "[a-zA-Z]{3,}").Success || // Not more than 3 chars in sequence
035                 Regex.Match(pwd, @"(\w)\1{2,}").Success || //Same number should not repeat more than 2 times
036                 Regex.Match(pwd, "[1-9]{3,}").Success ||    // Not more than 3 numbers in sequence
037                 !Regex.Match(pwd, "[A-Z]").Success ||       // At least one upper case char
038                 !Regex.Match(pwd, "[a-z]").Success ||       // At least one lower case char
039                 !Regex.Match(pwd, "[1-9]").Success ||         // At least one number
040                 (pwd.ToArray().Where(l => SpecialChars.ToArray().Any(l2 => l2 == l)).Count() == 0) // At least one pre defined special char
041                 );
042             
043             return pwd;
044         }
045
046         static string GeneratePassword(int MinLength, int MaxLength)
047         {
048             string ValidChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ:;<>|=.,_-~!?&%@#$£€°^*§()+[] ";
049             string SpecialChars = "!@#$%^&*()";
050             
051             string pwd = string.Empty;
052
053             Random rnd = new Random(Guid.NewGuid().GetHashCode());
054             
055             bool NumExist = false;
056             bool IsUpper = false;
057             bool IsLower = false;
058             bool IsSplChr = false;
059             bool NoRepeat = true;
060             bool NoSeq = true;
061
062             while ((!NumExist || !IsUpper || !IsLower || !IsSplChr) && (NoRepeat || NoSeq) )
063             {
064                 NumExist = false;
065                 IsUpper = false;
066                 IsLower = false;
067                 IsSplChr = false;
068                 NoRepeat = true;
069                 NoSeq = true;
070                 
071                 pwd = string.Join(string.Empty, Enumerable.Repeat(ValidChars, rnd.Next(MinLength, MaxLength + 1)).Select(s => s[rnd.Next(s.Length)]).ToArray());
072                 for (int i = 0; i < pwd.Length; i++)
073                 {
074                     // Contains at least 1 lower case letter and 1 upper case letter (all UTF-8), at least 1 number
075
076                     if (!NumExist)
077                     {
078                         NumExist = (char.IsDigit(pwd[i]) && true);
079                     }
080                     if (!IsUpper)
081                     {
082                         IsUpper = (char.IsUpper(pwd[i]) && true);
083                     }
084                     if (!IsLower)
085                     {
086                         IsLower = (char.IsLower(pwd[i]) && true);
087                     }
088
089                     // A predefined set of special chars must be present
090                     if (!IsSplChr)
091                     {
092                         IsSplChr = (SpecialChars.IndexOf(pwd[i]) >= 0);
093                     }
094
095
096                     // Not more than 2 identical characters in a row (e.g., 111 not allowed)
097                     if (i < pwd.Length - 2 && NoRepeat)
098                     {
099                         NoRepeat = !((pwd[i] == pwd[i + 1]) && (pwd[i] == pwd[i + 2]));
100                     }
101
102                     // Not any sequence of the English alphabet / numbers (above 3 letters)
103                     if (i < pwd.Length - 2 && NoSeq)
104                     {
105                         NoSeq = !((pwd[i + 2] - pwd[i + 1]) == (pwd[i + 1] - pwd[i]));
106                     }
107                     Console.WriteLine(!NumExist +" "+ !IsUpper + " " + !IsLower + " " + !IsSplChr + " " +  NoRepeat +NoSeq);
108                 }
109                 
110             }
111             
112             return pwd;
113
114         }
115     }
116 }
117
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