await not working foreach code example

Example 1: async foreach

[1, 2, 3].forEach(async (num) => {  await waitFor(50);  console.log(num);});console.log('Done');

Example 2: C# foreach loop async but wait at end

public async Task RunAsync()
{
    var tasks = new List<Task>();
 
    foreach (var x in new[] { 1, 2, 3 })
    {
        var task = DoSomethingAsync(x);
        tasks.Add(task);
    }
 
    await Task.WhenAll();
}