C# Online Compiler | .NET Fiddle

using System;
using System.Threading;
using System.Threading.Tasks;
					
public class Program
{
	public static void Main()
	{
		Parallel.Invoke(
			BasicAction,
			() => {
				Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
			},
			delegate()
			{
				Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
			}
		);
	}
	
	private static void BasicAction()
	{
		Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
	}
}

 
using System;
using System.Threading;
using System.Threading.Tasks;
                    
public class Program
{
    public static void Main()
    {
        Parallel.Invoke(
            BasicAction,
            () => {
                Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
            },
            delegate()
            {
                Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
            }
        );
    }
    
    private static void BasicAction()
    {
        Console.WriteLine("Thread={0}", Thread.CurrentThread.ManagedThreadId);
    }
}

Cached Result

Root version: 2
Versioned files:
  Key: DB
  Label: Table0
  Items:
    Version: 0
    Fields:
      Field name: key
      Field type: StringU8

      Field name: value
      Field type: Float

  Key: NoDbObject
  Label: (none)
  Items:
    Version: 1
    Fields:
      Field name: objectProp
      Field type: StringU8