https://timwise.co.uk/2014/05/10/throw-vs-throw-ex-vs-wrap-and-throw-in/

puke.cs

using System;
class puke{

static void Main(string[] args) {
		try {
			ThrowException1();
		} catch (Exception x) {
			Console.WriteLine("Exception 1:");
			Console.WriteLine(x);
		}
		try {
			ThrowException2();
		} catch (Exception x) {
			Console.WriteLine("Exception 2:");
			Console.WriteLine(x);
		}
		try {
			ThrowException3(); // line 18
		} catch (Exception x) {
			Console.WriteLine("Exception 3:");
			Console.WriteLine(x);
		}
	}

	private static void ThrowException1() {
		try {
			DivByZero(); // line 27
		} catch {
			throw;
		}
	}

	private static void ThrowException2() {
		try {
			DivByZero(); // line 35
		} catch (Exception ex) {
			throw ex;
		}
	}

	private static void ThrowException3() {
		try {
			DivByZero(); // line 43
		} catch (Exception ex) {
			throw new Exception("doh", ex); // line 45
		}
	}

	private static void DivByZero() {
		int x = 0;
		int y = 1 / x; // line 51
	}
}


-----
Loaded assembly: /home/tim/repo/puker/bin/Debug/puke.exe
Exception 1:
System.DivideByZeroException: Division by zero
  at puke.DivByZero () [0x00002] in /home/tim/repo/puker/puke.cs:51 
  at puke.ThrowException1 () [0x00000] in /home/tim/repo/puker/puke.cs:27 
Exception 2:
System.DivideByZeroException: Division by zero
  at puke.DivByZero () [0x00002] in /home/tim/repo/puker/puke.cs:51 
  at puke.ThrowException2 () [0x00000] in /home/tim/repo/puker/puke.cs:35 
Exception 3:
System.Exception: doh ---> System.DivideByZeroException: Division by zero
  at puke.DivByZero () [0x00002] in /home/tim/repo/puker/puke.cs:51 
  at puke.ThrowException3 () [0x00000] in /home/tim/repo/puker/puke.cs:43 
  --- End of inner exception stack trace ---
  at puke.ThrowException3 () [0x0000b] in /home/tim/repo/puker/puke.cs:45 
  at puke.Main (System.String[] args) [0x00040] in /home/tim/repo/puker/puke.cs:18