Is there a way to iterate over multiple collections of data with the same loop?

So basically could this two seperate steps

foreach (var x in array1) 
{
    DoSomething(x);
}

foreach (var x in array2) 
{
    DoSomething(x);
}

be combined into one?

Of course this is possible - thanks to LINQ:

foreach (var x in array1.Concat(array2)) 
{
    DoSomething(x);
}

Note that since LINQ operates at the enumerator level, it will not allocate a new array to hold elements of array1 and array2. So, on top of being rather elegant, this solution is also space-efficient.