using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using Microsoft.Win32;
using System.Management;

namespace ConsoleApplication1
{

    class Program
    {
        private static string GetSystemCode_int1(byte[] byte_0)
        {
            if (byte_0 != null)
            {
                return Convert.ToBase64String((new MD5CryptoServiceProvider()).ComputeHash(byte_0));
            }
            else
            {
                return string.Empty;
            }
        }

        private static string GetSystemCode_int0(string string_2)
        {
            if (!string.IsNullOrEmpty(string_2))
            {
                return GetSystemCode_int1(Encoding.UTF8.GetBytes(string_2));
            }
            else
            {
                return string.Empty;
            }
        }

        public static string GetSystemCode()
        {
            string key = null;
            if (key == null)
            {
                string empty = string.Empty;
                try
                {
                    ManagementClass managementClass = new ManagementClass("win32_processor");
                    ManagementObjectCollection instances = managementClass.GetInstances();
                    foreach (ManagementBaseObject instance in instances)
                    {
                        try
                        {
                            empty = string.Concat(empty, instance.Properties["processorID"].Value.ToString());
                            break;
                        }
                        catch
                        {
                        }
                    }
                }
                catch
                {
                    try
                    {
                        ManagementObjectSearcher managementObjectSearcher = new ManagementObjectSearcher("Select * From Win32_BaseBoard");
                        foreach (ManagementBaseObject managementBaseObject in managementObjectSearcher.Get())
                        {
                            empty = string.Concat(empty, managementBaseObject["SerialNumber"].ToString().Trim());
                        }
                    }
                    catch
                    {
                    }
                }
                try
                {
                    ManagementObject managementObject = new ManagementObject("win32_logicaldisk.deviceid=\"C:\"");
                    managementObject.Get();
                    empty = string.Concat(empty, managementObject["VolumeSerialNumber"].ToString());
                }
                catch
                {
                }
                if (string.IsNullOrWhiteSpace(empty))
                {
                    empty = Environment.MachineName;
                }
                key = GetSystemCode_int0(empty);
            }
            return key;
        }

        static void Main(string[] args)
        {
            Console.WriteLine(GetSystemCode());
            Console.ReadKey();
        }
    }
}

  [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
    public class MainActivity : AppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
        }
    }  

  protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            LinearLayout ln;
            Button btn;
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);
            for (int i = 0; i < 5; i++)
            {
             btn = new Button(this);
             btn.Text = i.ToString();
             ln= FindViewById<LinearLayout>(Resource.Id.linearLayout1);
             btn.Click += Btn_Click;
             ln.AddView(btn);
            }
        }
        private void Btn_Click(object sender, System.EventArgs e)
        {
            Button btntest = sender as Button; 
            btntest.SetBackgroundColor(Android.Graphics.Color.Blue);
        }
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minWidth="25px"
    android:minHeight="25px">
    <LinearLayout
        android:orientation="vertical"
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout1" />
</RelativeLayout>

<cdk-virtual-scroll-viewport></cdk-virtual-scroll-viewport>

npm install -g @angular/cli

ng new angular7-virtualScrolling

Tools > Options > Project and Solutions > .Net Core

Tools -> Options -> Environment -> Preview Features

jobs:
  build:

    runs-on: windows-latest
    
    steps:
    - name: Checkout
      uses: actions/checkout@v2
        
    - name: Setup MSBuild
      uses: microsoft/setup-msbuild@v1.0.0  
       
    - name: Setup NuGet
      uses: nuget/setup-nuget@v1.0.2
     
    - name: Restore NuGet Packages
      run: nuget restore src/WebApplication1.sln
 
    - name: Build (Release)
      run: msbuild src/WebApplication1.sln /p:Configuration=Release

@namespace BlazorLib

[ServiceContract]
public interface IBookService
    {
        [OperationContract]
        int GetCountOfBook();
    }

 [ServiceBehavior(IncludeExceptionDetailInFaults = true)]
    public class BookService : IBookService
    {
        public int GetCountOfBook()
        {
            return 10;
        }
    }

 class Program
    {
        static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(BookService));

            var binding = new BasicHttpBinding();
            
            host.AddServiceEndpoint(typeof(IBookService), binding, "http://localhost/BookService");
            host.Open();

            Console.Write("BookService host");

            Console.ReadKey();
        }
    }

        static void Main(string[] args)
        {
            Thread.Sleep(2000);
            BasicHttpBinding binding = new BasicHttpBinding();

            ChannelFactory<IBookService> channel = new ChannelFactory<IBookService>(binding, new EndpointAddress("http://localhost/BookService"));

            Console.WriteLine("Count of book: {0}", channel.CreateChannel().GetCountOfBook());

            Console.ReadKey();
        }

 static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(BookService));

            var binding = new BasicHttpBinding();
            binding.Security = new BasicHttpSecurity();
            binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
            binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;

            host.Credentials.UserNameAuthentication.UserNamePasswordValidationMode = System.ServiceModel.Security.UserNamePasswordValidationMode.Custom;

            host.Credentials.UserNameAuthentication.CustomUserNamePasswordValidator = new CustomUserNamePasswordValidator();               

            host.AddServiceEndpoint(typeof(IBookService), binding, "http://localhost/BookService");
            host.Open();


            Console.Write("BookService host");

            Console.ReadKey();
        }

 public class CustomUserNamePasswordValidator : UserNamePasswordValidator
    {
        public override void Validate(string userName, string password)
        {
            if (userName != "Masoud" || password != "Pakdel")
                throw new SecurityException("Incorrect userName or password");
        }
    }

static void Main(string[] args)
        {
            Thread.Sleep(2000);
            BasicHttpBinding binding = new BasicHttpBinding();

            binding.Security = new BasicHttpSecurity();
            binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
            binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;            

            ChannelFactory<IBookService> channel = new ChannelFactory<IBookService>(binding, new EndpointAddress("http://localhost/BookService"));

            channel.Credentials.UserName.UserName = "WrongUserName";
            channel.Credentials.UserName.Password = "WrongPassword";
 



           Console.WriteLine("Count of book: {0}", channel.CreateChannel().GetCountOfBook());

            Console.ReadKey();
        }

channel.Credentials.UserName.UserName = "WrongUserName";
channel.Credentials.UserName.Password = "WrongPassword";