C# how to read and write

//Read a Text File
using System;
using System.IO;

namespace readwriteapp
{
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
		{

			String line;

		try
			{
				//Pass the file path and file name to the StreamReader constructor
				StreamReader sr = new StreamReader("C:\\boot.ini");

				//Read the first line of text
				line = sr.ReadLine();

				//Continue to read until you reach end of file
				while (line != null)
				{
					//write the lie to console window
					Console.WriteLine(line);
					//Read the next line
					line = sr.ReadLine();
				}

				//close the file
				sr.Close();
				Console.ReadLine();
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception: " + e.Message);
			}
			finally
			{
				Console.WriteLine("Executing finally block.");
			}
		}
	}
}

//Write a text file - Version-1
using System;
using System.IO;

namespace readwriteapp
{
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
		{
			try
			{

				//Pass the filepath and filename to the StreamWriter Constructor
				StreamWriter sw = new StreamWriter("C:\\Test.txt");

				//Write a line of text
				sw.WriteLine("Hello World!!");

				//Write a second line of text
				sw.WriteLine("From the StreamWriter class");

				//Close the file
				sw.Close();
			}
			catch(Exception e)
			{
				Console.WriteLine("Exception: " + e.Message);
			}
			finally
			{
				Console.WriteLine("Executing finally block.");
			}
		}
	}
}