Hello World!
I'm talking about
creating an nested if/else
block of statements in C#.
I've started a new program
and I'm going to use a scrollbar
to select a numeric grade
from 0 to 100.
and then I'm going to show the letter grade.
as we go along.
We have two scrollbars
we have the horizontal scrollbar
right here,  and we have the vertical scrollbar .
They're really exactly the same
but I'm going to use the vertical scrollbar just for fun here.
and if you make this just a little bigger
it's a little easier, uh,
to select values.
So let's make the form a little bigger.
Let's pull this down , you see the difference?
Between  moving it, and then using the handles to make it bigger.
So let's call this
vsbGrade
And I want to make the minimum zero,
which it is anyway.
And the maximum one hundred.
Which is just fine for this.
And we need a label and say
I'm going to call this lblInstructions.
[typing]
And for the text going to say
"Select the numeric grade"
[typing]
I'd like this just a little up there.
and then go back to my toolbox
And I need a label to display the numeric grade,
and then I need a label for the letter grade.
So one of these I'm going to call
lblGrade and
[mumbles]
You always want you start a program
you don't want something false to appear.
So right now what is the value on that scrollbar?
The  value is zero,
so let's put in this label,
that's going to show the grade,
Let's put the text is zero.
and that matches where we are when we start.
The second label I'm going to call
lblLetter
And since the scrollbar is zero,
the text for this should be F.
And that will match what we have to start with.
So let's
Ah, we should also have some labels to tell what this is.
I'll put this up here.
and then,  I'll call this
This is going to have to F,  let's just get another label here ,
and call it lblLletteHeader .
and make the text say
Your letter grade
is...
Then I can put this right next to that
and it'll look like a sentence has appeared.
I'm going to [mumbles] There we go.
Alright, I'm going to double-click on the scrollbar
and that's going to open up
the scroll event
and I'm going to say  if,
vsbGrade
I can just hit tab at this point
.value  is less than 65,
lblLetter.Text
equals, double quotes, F.
I'm going to copy this line, copy this whole line and paste it.
and put else in front of it and less than 70, it's a D.
And again put else in front, and if it's less than 80 that is a C.
Copy this whole thing.
And if it's less than 90, thats B.
And now, I'm just going to say else, make that an A.
For the last one we don't have to do any comparison,
If, this is false, then it's an A,  then it's 90 or above.
What happens when we run this, the minute we have a match,
we skip all the elses that are paired with that.
So let's run that and see what happens here and...
nothing.. way down here..  I know what I forgot to change,
go back to this,
This one, we need the large change, has to be changed to one.
Let's run that again...
I'm not displaying... I forgot to display the grade.
I need to display in that, that is,
lblGrade, Let's go back to  our core code and display
lblGrade.Text
equal, I can't just assign a numeric value to that I have to concatenate to a null string.
vsbGrade.value
And now let's run it, there we go,  you can see, now
The minute it changes to 65,
64 is an F and then 67 is D
the and down to 78 it's a C and 89 is a B.
90 is an A.
All the way down,  you can use these little arrows
to move one step at a time if that's a little easier
than playing with the thumb.
And that's it!