Hello world!
I'm talking about creating an array of objects  in C#.
I've started a new project called colorChange
and I'm going to add a timer to the form.
and the timer doesn't actually here on the form
it's down beneath,
it's a resource that the form can use.
If I go to the properties for the timer,
there is an enabled value
I'm going to double-click and change that to true.
and then the interval,
I'm going to change to at least 1000.
And every time the timer goes off,
I'm going to change the color of the form.
So I'm going to double-click on the timer control
and write the code for the tick event
for the timer.
Let me just move that toolbox and properties window out of the way.
Every time the timer goes off I went to change the color.
and I'm going to create a global variable
by putting this declaration right above form one.
So that it's not inside
any of these functions or methods of the form,
but will be available to the whole form.
If I make a string notice that string is a lower case s,
And then the square brackets
indicate that this is an array.
I'm going to name it myColors =
and then inside the curly braces
I'm going to have "red", "white" and "blue"
That red squiggle means we need a semicolon (;)
And we have an array of colors,
the words for the colors.
Now I'm going to create an array of actual colors.
and this begins with capital "C".
Otherwise, the format is pretty much the same.
And the curly braces, and then were going to have Color.red, (comma)
Color.white,
and Color.blue.
and again, the semicolon.
And then I also need an integer
to indicate what position in the array
int,  and start that with 0.
And then every time the timer goes off
I have that there twice, let me get rid of this one.
OK.  Every time the timer goes off
I'm going to say
this.BackColor
equals colors, referring to that array,
"sub" position.
And when I speak, I often say "sub"
"sub" stands for subscript.
So the first time the timer goes off we're going to make the background color red.
That's in position zero, and I'm also going to put
the text  equals myColors
"Sub" position (  [position]  )
And then I'm going to add one to position,  by using the ++
But now I've got to be careful!
If it goes beyond, if it goes too far this is 0..1..2;  if it becomes 3,
I need to set it back to zero,
but I'm going to use three,
because I might decide to add green and yellow to this.
So instead I'm going to use the Length function.
If  position
is greater than or EQUAL to
colors.Length
position = 0;
And let's run it.
Wait a minute; it seems there's some error. Let's see what's happening here.
There were build errors.  NO!  I don't want to run the last successful build.
I have in here that there are
I have tick_1, I'm going to change that to tick.
And let's go and run it again and see if that solves the problem.
There we go, it's red, white, blue, back to red., and so on.
Let's go back to our code for that.
I'm going to move this out of the way, since we solved that problem.
If I changed this and I added another color here:
Green,  and I added Colors.Green
here...
that would cycle through all of those colors
because I'm comparing it to colors.Length.
instead of that.  And these two arrays are very carefully
kept in the same order and the same size
Those are called parallel arrays, they are definitely related to each other.
And now we have green included on that list.
And that's it!