how do i foreach c#

var fibNumbers = new List<int> { 0, 1, 1, 2, 3, 5, 8, 13 };
int count = 0;
foreach (int element in fibNumbers)
{
    count++;
    Console.WriteLine($"Element #{count}: {element}");
}
Console.WriteLine($"Number of elements: {count}");

//No counter just the foreach.
 //the HelloWorld is the Class objects name nor a public string can be used aswell.
foreach (string element in fibNumbers)
{
    Console.WriteLine(element.HelloWorld);
}

var fibNumbers = new List<int> { 0, 1, 1, 2, 3, 5, 8, 13 };
int count = 0;
foreach (int element in fibNumbers)
{
    count++;
    Console.WriteLine($"Element #{count}: {element}");
}
Console.WriteLine($"Number of elements: {count}");

var numbers = new NumberList<int> { 0, 1, 2, 3, 4, 5 };
foreach (int num in numbers)
{
    DoSomething();
}

foreach (int num in numbers)
{
  
}