Csharp/C Sharp/Development Class/Unicode UTF16

Write special symbol to Text file: pi (\u03A0r^2)

using System;
using System.IO;
using System.Text;
class Test
{
    public static void Main() 
    {        
        using (StreamWriter output = new StreamWriter("practice.txt")) 
        {
            // Create and write a string containing the symbol for Pi.
            string srcString = "Area = \u03A0r^2";
            output.WriteLine("Source Text : " + srcString);
            Console.WriteLine(srcString);
        }
    }
}

Write the UTF-16 encoded bytes of the source string

using System;
using System.IO;
using System.Text;
class Test
{
    public static void Main() 
    {        
        using (StreamWriter output = new StreamWriter("practice.txt")) 
        {
            // Create and write a string containing the symbol for Pi.
            string srcString = "Area = \u03A0r^2";
            // Write the UTF-16 encoded bytes of the source string.
            byte[] utf16String = Encoding.Unicode.GetBytes(srcString);
            output.WriteLine("UTF-16 Bytes: {0}", BitConverter.ToString(utf16String));
            Console.WriteLine(BitConverter.ToString(utf16String));
        }
    }
}

Write the UTF-8 and ASCII encoded byte arrays

using System;
using System.IO;
using System.Text;
class Test
{
    public static void Main() 
    {        
        using (StreamWriter output = new StreamWriter("practice.txt")) 
        {
            // Create and write a string containing the symbol for Pi.
            string srcString = "Area = \u03A0r^2";
            // Convert the UTF-16 encoded source string to UTF-8 and ASCII.
            byte[] utf8String = Encoding.UTF8.GetBytes(srcString);
            byte[] asciiString = Encoding.ASCII.GetBytes(srcString);
            
            // Write the UTF-8 and ASCII encoded byte arrays. 
            output.WriteLine("UTF-8  Bytes: {0}", BitConverter.ToString(utf8String));
            output.WriteLine("ASCII  Bytes: {0}", BitConverter.ToString(asciiString));
            
            Console.WriteLine(BitConverter.ToString(utf8String));
            Console.WriteLine(BitConverter.ToString(asciiString));
        }
    }
}