Regex Email validation in c# dot net core

 Use this regex

/^_?[a-zA-Z0-9]([a-zA-Z0-9]*[._+-])*[a-zA-Z0-9_]+@(?!-)[A-Za-z0-9-]{1,63}(?<!-)(\.(?!-)[A-Za-z0-9-]{1,63}(?<!-))*\.[A-Za-z]{2,}$/

Works like examples shows below:

Regex obfuscate email

 Use this code in C# to obfuscate email using regex

// Online C# Editor for free

// Write, Edit and Run your C# code using C# Online Compiler

using System;

using System.Text.RegularExpressions;

public class HelloWorld

{

    public static void Main(string[] args)

    {

        Console.WriteLine ("Try programiz.pro");

        string _PATTERN = @"(?<=.{4}).(?=[^@]*?@)|(?:(?<=@.)|(?!^)\G(?=[^@]*$))(.)(?=.*\.)[a-zA-Z0-9]";

 

        string s = "john.travolta12+-3878787@gmail.com";

      string replacement = "*";

      

      if (!s.Contains("@"))

        Console.WriteLine( new String('*', s.Length));

      if (s.Split('@')[0].Length < 4) 

        Console.WriteLine( @"*@*.*"); 

        string result = Regex.Replace(s, _PATTERN, replacement);

      Console.WriteLine(result);

    

    }

}

c# httpclient The remote certificate is invalid according to the validation procedure: RemoteCertificateNameMismatch

 If we get this error while trying to get http reponse using HttpClient object, it could mean that certificate validation fails for the remote server. In this case we could get around the issue by overriding certification validation logic like so:

var handler = new HttpClientHandler

 {

     ClientCertificateOptions = ClientCertificateOption.Manual,

     ServerCertificateCustomValidationCallback = (httpRequestMessage, cert, cetChain, policyErrors) => true

 };

 handler.AllowAutoRedirect = false;

       

 handler.ServerCertificateCustomValidationCallback = (cert, chain, erros, flag)=> { return true; };

 var apiClient = new HttpClient(handler);

 apiClient.SetBearerToken(tokenResponse.AccessToken);

 

 var response = apiClient.GetAsync(apiUrl).Result;

SSL Error - The connection for this site is not secure

 After cloning a git repo of dot net framework website and trying to run it all I could see was this error

Turns out the fix was to simply enable SSL in F4 properties windows and default website start url to SSL url

Secure micro services using jwt and ocelot

 Secure Microservices Using JWT With Ocelot in .NET Core (code-maze.com)

C# generic type converter

 Here is a way to create a generic type converter in c#

c# - How to Convert a String to a Nullable Type Which is Determined at Runtime? - Stack Overflow

Share cookies between dot net framework and dot net core

Since dot net framework encryption is different from that of dot net core, encrypted cookies cannot be directly shared between the two. Instead we need to create a compatible data protector as explained at 
c# - share authentication cookie between .NET Framework and .Net Core - Stack Overflow