[C#] Correct way of throwing exception from a catch block

There are two ways to catch and re-throw an exception, below the two code snippets:
Snippet #1:

   1:  try

   2:  {

   3:   

   4:  }

   5:  catch(Exception ex)

   6:  {

   7:    throw ex;

   8:  }

Snippet #2:

   1:  try

   2:  {

   3:   

   4:  }

   5:  catch(Exception ex)

   6:  {

   7:    throw;

   8:  }

When you use snippet #1, you will re-throw the same exception object and as result of this the original stack trace will be lost. Snippet #2 will maintain the original stack trace, this is very useful for debugging.
One of the try/catch general exception handling guidelines says:
“Do not rethrow by throwing the same exception object. This causes the stack trace for the original exception to be lost--use a lone "throw;" statement (without an object following it) to "rethrow" a catch exception.”
The best way to see the difference is with a code example:

   1:  class Program

   2:  {

   3:    static void Main(string[] args)

   4:    {

   5:      try

   6:      {

   7:        Method1();

   8:      }

   9:      catch (Exception ex)

  10:      {

  11:        throw;

  12:      }

  13:    }

  14:   

  15:    public static void Method1()

  16:    {

  17:      Method2();

  18:    }

  19:   

  20:    public static void Method2()

  21:    {

  22:      throw new Exception();

  23:    }   

  24:  }

The following stack trace will be produced by the code example above:

   at ConsoleApplication2.Program.Method2()

   at ConsoleApplication2.Program.Method1()

   at ConsoleApplication2.Program.Main(String[] args)

   at System.AppDomain.ExecuteAssembly(Assembly assembly, String[] args)

   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

   at System.Threading.ThreadHelper.ThreadStart()

When you use throw ex; instead of throw; you will get:

   at ConsoleApplication2.Program.Main(String[] args)

   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)

   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

   at System.Threading.ThreadHelper.ThreadStart()

As you see the stack trace don’t have the calls to Method1 and Method2, so when you use throw ex; you will lose essential debug information.