loop through string array c#

//iterate the array
for (int i = 0; i < arr.Length; i++)
{
  // loop ...
}
// or
foreach (var element in arr)
{
  // loop ...
}

 string[] arr = new string[4]; // Initialize.
        arr[0] = "one";               // Element 1.
        arr[1] = "two";               // Element 2.
        arr[2] = "three";             // Element 3.
        arr[3] = "four";              // Element 4.

        // Loop over strings.
        foreach (string s in arr)
        {
            Console.WriteLine(s);
        }

int[] numberArray = { 4, 5, 6, 1, 2, 3, -2, -1, 0 };
foreach (int number in numberArray)
{
    System.Console.Write("{0} ", number);
}

//Using Linq to itterate over an array
var strArr = new string[4] {"one", "Two", "Three", "Four"};
Console.WriteLine(strArr.Select((s, i) => $"Item no: {i + 1}, Value: {s}"));

 for (int i = 0; i < theData.Length - 2; i+=3) 
    { 

        // use theData[i], theData[i+1], theData[i+2]

    }