C# Basic data manipulation 

Basic string and collection operations for C# version 5.  Which compiler comes with the built-in version of .NET in Windows 10. Though there is a lot of information and examples online available, it is hard to find the most effective ways to manipulate the data. The example program is divided into 4 blocks:
  
- block 1 is basic string manipulation
- block 2 is List operations
- block 3 is Dictionary operations
- block 4 is byte and string interactions

The content of the main.cs program:

using System;
using System.Text;
using System.Collections.Generic;

public class MainClass{
  public static void Main(string[] args){
    string st1 = "my/name/is/John";
    string[] ar1 = st1.Split("/");
    foreach(string sub1 in ar1){
      Console.WriteLine(sub1);
    }
    string st2 = String.Join("--", ar1);
    Console.WriteLine(st2);
    Console.WriteLine(st2.Substring(4,8));
    Console.WriteLine("{0}\r\n", st2.IndexOf("John"));
    
    List<string> lst1 = new List<string>();
    lst1.Add("Basic");
    lst1.Add("C++");
    lst1.Add("Python");
    foreach(var el1 in lst1){
        Console.WriteLine(el1);
    }
    int id1 = lst1.IndexOf("Python");
    Console.WriteLine("Index: {0}\r\n", id1);
    
    Dictionary<string, string> dct1 = new Dictionary<string, string>();
    dct1.Add("n1", "Basic");
    dct1.Add("n2", "C++");
    dct1.Add("n3", "Python");
    foreach(var el2 in dct1){
      Console.WriteLine("Key:{0} Value:{1}", el2.Key, el2.Value);
    }
    Console.WriteLine("Language: {0}\r\n",dct1["n2"]);

    string st3 = "7";
    Console.WriteLine("{0}", int.Parse(st3));
    String st4 = "10";
    int i2 = Convert.ToByte(st4, 16);
    Console.WriteLine("{0}", i2);
    String st5 = "a3";
    int i3 = Convert.ToByte(st5, 16);
    Console.WriteLine("{0}", i3);
    byte b1 = 0b00000101 | 0x01;
    Console.WriteLine(b1.ToString("x2"));
  }
}

The output of main.cs:

my
name
is
John
my--name--is--John
name--is
14

Basic
C++
Python
Index: 2

Key:n1 Value:Basic
Key:n2 Value:C++
Key:n3 Value:Python
Language: C++

7
16
163
05