Best Practice Csharp Use NameOf for Constant

#100DaysOfCode
Csharp Best practice - Const pic.twitter.com/bESVIrbfR3

— san (@santoshpoojari3) August 19, 2021

Productivity Tool MSBUILDLog and Project

Download https://msbuildlog.com/

Visual Studio Build Log Extension

Tools to make working with the Visual Studio project system for C#, Visual Basic, and F# easier. This extension is for VS2017 and VS2019. Search the extension marketplace if you require a different version. Build logging A tool window is added under View > Other Windows > Build Logging. The window allows logging both regular and design-time builds in the project system. See the docs for more information.

https://marketplace.visualstudio.com/items?itemName=VisualStudioProductTeam.ProjectSystemTools

Hello world Csharp

Next time you write Hello World! Do this,

using static System.Console;

public class Program {

static void main() => WriteLine("Hello World");

}

 

Csharp Interface with same method implementation

Clean Code Exception Filters in c#

 

Clean code always looks like it was written by someone who cares.”

― Robert C. Martin, Uncle Bob

C# Exception filters has been around since advent of C# 6.0 , I'm sure we rarely use it because we are so used to old way of using conditional exception handling.

Cut to the chase........!

Run dotnet in browser

https://try.dot.net/

Happy Coding!

Azure Storage Message Queue Topic & Service Bus

 

Azure Managed Identities- System Identity vs User Assigned Identity

 

Managed Identities

Managed Identities are in essence 100% identical in functionality and use case than Service Principals. In fact, they are actually Service Principals.

What makes them different though, is: – They are always linked to an Azure Resource, not to an application or 3rd party connector – They are automatically created for you, including the credentials; big benefit here is that no one knows the credentials

Managed Identities exist in 2 formats: – System assigned; in this scenario, the identity is linked to a single Azure Resource, eg a Virtual Machine, a Logic App, a Storage Account, Web App, Function,… so almost anything. Next, they also “live” with the Azure Resource, which means they get deleted when the Azure Resource gets deleted. – User Assigned Managed Identity, which means that you first have to create it as a stand-alone Azure resource by itself, after which it can be linked to multiple Azure Resources. An example here could be out of an integration with Key Vault, where different Workload services belonging to the same application stack, need to read out information from Key Vault. In this case, one could create a “read KV” Managed Identity, and link it to the web app, storage account, function, logic app,… all belonging to the same application architecture.

Let’s walk through a quick demo scenario for both, using a Virtual Machine as Azure Resource:

• From the Azure Portal, select the Virtual Machine; under settings, find Identity
• Set Status as On, and save the changes

Switching to Azure Key Vault / Access Policies, we can now define this System Assigned Managed Identity having get and list permissions (or any other) for keys, secrets or certificates. For example reading out an Azure Storage Account Access key or similar.

Notice how Azure Key Vault is expecting a Service Principal object here (where in reality we are using a Managed Identity).

Similarly, let’s remove the System Assigned MI of the VM and use a User Assigned one in the next example (an Azure Resource can only be linked to one or the other, not both…):

• From the Azure Virtual Machine blade, navigate to Identity and switch the “Status” toggle button to Off.
• This will prompt for your confirmation when saving the settings

As you notice, the Managed Identity object gets immediately removed from Azure AD. Yes, security is key here…

• Wait for the deregistration of the object.

Remember that a User Assigned Managed Identity is a stand-alone Azure Resource, which needs to be created first, after which you can assign it to another Azure Resource (our VM in this scenario).

• From the Azure Portal, Create new Resource, and search for “User Assigned Managed Identity”

• click Create.
• Specify the Resource Group, Azure Region and Name for this resource.

• Confirm by clicking create and Wait for the resource creation to complete successfully.
• Once created, switch back to the Azure Virtual Machine, select Identity and select User Assigned
• Notice the Managed Identity you just created.

• Select it and add it as a Virtual Machine User Assigned object.

• Select another Azure Resource in your subscription, for example an Azure Web App, Logic App,… and once more select Identity from the settings. Below screenshot shows what it looks like for an Azure Web App Resource:

To complete the sample scenario, let’s go back to Azure Key Vault, and specify another Access Policy for this User Assigned Managed Identity:

• Select your Azure Key Vault resource, followed by selecting Access Policy from the settings.
• Specify the Key and/or Secret Permissions (for example get, list)
• Click “Select Principal” and search for the User Assigned Managed Identity you created earlier

After saving the changes, the result is that now both the Azure Virtual Machine as well as the Web App – having the User Assigned Managed Identity assigned to them – can read our keys and secrets from Azure Key Vault.

Summary

In this post, I wanted to clarify the use case, difference and similarities between Service Principals and Managed Identities. A Service Principal could be looked at as similar to a service account-alike in a more traditional on-premises application or service scenario. Managed Identities are used for “linking” a Service Principal security object to an Azure Resource like a Virtual Machine, Web App, Logic App or similar. For a 1:1 relation between both, you would use a System Assigned, where for a 1:multi relation, you would use a User Assigned Managed Identity.

Technical Architect B2B and B2C Authentication , Authorization and Access Policy

 

Azure messaging services - Event Grid, Event Hubs, and Service Bus

 

Comparison of services

COMPARISON OF SERVICES

Service	Purpose	Type	When to use
Event Grid	Reactive programming	Event distribution (discrete)	React to status changes
Event Hubs	Big data pipeline	Event streaming (series)	Telemetry and distributed data streaming
Service Bus	High-value enterprise messaging	Message	Order processing and financial transactions

Azure Traffic Manager , WAF CDN , DNS -Load Balancer

 Client Browser--> DNS Lookup---> WAF/CDN---> Azure Traffic manager--> Main Site URL and DR (Disaster Recovery URL)

Cool Stuff Microsoft Math Solver in Microsoft EDGE browse

 Go to the three dotted , click on it then select Apps-> Manage App

On the Edge Search Bar ,S type in Flags , see the screenshot for more details.

It is experiments package, so Click on ENABLED and then on Restart button to initiate and installation of this app.

Load some Algebraic Equation to test this app.

Linear Equations Worksheet (homeschoolmath.net)

Voila!

You can also check out PhotoMath App for Android and IOS. 

Technology is evolving fast. Get a taste of it.

Web Developer must know -File Sharing Protocol Filesystem- NFS, SMB, AFP and FTP

 

 

File sharing protocols: Application Layer
Protocol	Description
SMB (Server Message Block)	Supported by Microsoft Windows computers and sometimes by Mac OS X protocol is enabled by default. It is sometimes referred to as the CIFS (Common Internet File Service) file-sharing protocol.   SMB uses TCP/IP.
NFS (Network File Service)	Linux and Unix computers use NFS. Mac OS X users can access NFS shared folders through console shell access. UDP and TCP and NFS v4 over TCP.
AFP (Apple File Protocol)	Mac OS X computers use AFP.
FTP (File Transfer Protocol) and FTPS (FTP with SSL encryption)	Many public file upload and download sites use FTP.
Rsync	Fast file-transfer protocol that uses a delta-transfer algorithm that sends only the differences between the source file and the existing file.
HTTP (Hypertext Transfer Protocol and HTTPS (HTTP with SSL encryption)	Used on the World Wide Web.
SSH( Secure Socket Shell	Remote access to machine vis SSH connection.

Az-204 Azure Compute Solutions

 

AZ-204 Develop for Azure Storage Scenario and Use case Questions Answers

 

Latency vs Bandwidth vs Throughput

 We come across these terms Latency, Bandwidth and throughput. Sometimes we might have confused ourselves most of the time. Below images are thousand words.

AZ-204 API Management APIM

 

 

 

Was SSL now it is TLS

 

HTTP

HTTPS

SSL

SSL 1.0

SSL 2.0

SSl 3.0

SSL 3.1

Netscape Navigator Browser :SSL 1.0/2.0

History Browser War

{ IE vs Netscape }

In the year 1999 Browser War erupts between Microsoft IE and Netscape Navigator Browser .

Many developers had no choice but to tailor their websites for one browser or the other. Of course, it was ultimately the users that suffered.

With the release of Internet Explorer 3.0, Microsoft dropped the hammer. They included this version, for free, bundled right into the Windows ’95 operating system.

Netscape pricing model fell apart

In November of 1998, Netscape was sold to AOL for $4.2 billion- The end of pioneer.

TLS : Awakening of TLS

Some known facts, 10% of the time ,On prim application downtime is due to expired certificate.