Try it No 11

harold4964 · April 26th, 2011, 02:47 AM

Howdy I have your book Its great
Im stuck on the try it in chapter 11
I have C#2010 express running on win7 64Bit

I have set the page out in the same fashion as your example

The name properties I gave the NumericUpDown are quantity1 quantity2 and so on
when i go into the calculate button to put in the input values

[decimal quantity1 = quantity1NumericUpDown.Value]

I get the error
The name 'quantity1NumericUpDown' does not exist in the current context

Any suggestions on where im might be going wrong

I am sure I have named everything right and calling it as I have named it

Imar · April 26th, 2011, 07:05 AM

Quote:

The name properties I gave the NumericUpDown are quantity1 quantity2 and so on

Shouldn't you be using those properties in the code then?

decimal quantity1 = quantity1.Value

Since you now declare quantity1 twice, you need to rename either one of them. E.g.:

decimal quantity = quantity1.Value

or

decimal quantity1 = quantity1NumericUpDown.Value
In the latter case, you should rename the control from quantity1 to quantity1NumericUpDown.

Hope this helps,

Imar

Rod Stephens · April 26th, 2011, 09:02 AM

It sounds like Imar may be right. Make sure the name you use for the control is the same in the code and in the form designer. It sounds like the designer think you didn't name them quantity1NumericUpDown etc. but possibly something like quantity1.

harold4964 · April 29th, 2011, 09:17 PM

Not sure how i missed that one
I think I was trying to Over Complicate the problem
just goes to show that It can be so simple and still under your nose

anyways I got another question
In the Try it no 11 where i am trying to display my results

[extPrice1TextBox1.text = extPrice1.ToString("C");]

I am getting an error telling me

Error 1 'decimal' does not contain a definition for 'Text' and no extension method 'Text' accepting a first argument of type 'decimal' could be found (are you missing a using directive or an assembly reference?)

everything before this built ok but when i start the code for the display results comes up with this error

im using VisualC# 2010 Express on Win7 64Bit

Rod Stephens · April 30th, 2011, 07:41 PM

[extPrice1TextBox1.text = extPrice1.ToString("C");]

The error message sounds like it thinks the variable extPrice1TextBox1 is a decimal variable and not a text box. Then it complains because the decimal data type doesn't have a Text property or method.

Double check that this is where the error is and that extPrice1TextBox1 is a text box and not a misnamed variable. If you're not sure, right-click on the variable and select "Go To Definition" to see where it's defined. (If it throws you into the code containing the form definitions, just take a look and close it.)

Let me know if that solves it.

Ilyaalex · March 26th, 2012, 09:58 AM

Trying to make Try-IT in 11 Chapter.
But had a message "System.FormatException was unhandled" at this line:
decimal priceEach1 = decimal.Parse(priceEach1TextBox.Text);
Any ideas what should I correct?

Imar · March 26th, 2012, 02:43 PM

Hi there,

I don't have the book so I don't exactly what the example is supposed to do, but could it be that your copy of Windows has other regional settings (e.g. another language than English, or just changed regional settings0. If that's the case, you may need to swap commas and dots. E.g. use 323,35 instead of 323.35.

Cheers,

Imar

Ilyaalex · March 29th, 2012, 10:55 AM

Thank you, Imar. It really helps.

Rod Stephens · March 30th, 2012, 08:49 AM

Sorry for the slow reply. I'm out of town and logging in is iffy.

Switching the . and , will do it if your system is set up that way. You would get that message in any case where the text doesn't look like a number. For example, if you enter "1.2.3" or "two" or if you leave the field blank.

In later lessons you'll learn how to test for bad values and how to use the try catch block to protect the program in case the user enters something unexpected like this.