public static bool ArrayElementsAreEqual(string[] arrayToCheck)
{
    if (arrayToCheck == null || arrayToCheck.Length == 0)
    {
        // Empty arrays are considered equal I guess?
        return true;
        // Or throw an error
        // throw new Exception("wtf");
    }

    var firstChar = arrayToCheck[0];
    var lastIndex = arrayToCheck.Length - 1;
    for()
    for (var index = 1; index <= lastIndex; index++)
    {
        if (arrayToCheck[index] != firstChar)
        {
            return false;
        }
    }
    return true;
}