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Parallel.ForEach(collection, (item) =>
{
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});

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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
class Program
{
static void Main()
{
List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
Parallel.ForEach(numbers, (number) =>
{
Console.WriteLine(number * 2);
});
Console.ReadLine();
}
}

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