Copyright Question - C# Discussion Boards

Zaegra29-Nov-09 7:41

Zaegra

29-Nov-09 7:41

stancrm wrote:
I think

I need more certainty than that, but thanks for your reply. Smile | :)

Anyone else knows? Confused | :confused:

Motivation is the key to software development.

Richard MacCutchan29-Nov-09 9:58

Richard MacCutchan

29-Nov-09 9:58

Zaegra wrote:
I've implemented the code from http://www.neowin.net/forum/lofiversion/index.php/t180600.html[^] into my project

If you have implemented code from a different forum, why not ask this question at that forum, as we do not know what their rules are.

Zaegra29-Nov-09 11:01

Zaegra

29-Nov-09 11:01

That question is easy to answer: That thread has been abandoned a million years ago, plus, I find the Codeproject a very reliable source of information. That's why I posted the question here, and not there Wink | ;)

Motivation is the key to software development.

C# string conversion issues

DaveyM6929-Nov-09 11:48

DaveyM69

29-Nov-09 11:48

Well their site displays no copyright notices apart from for the theme it uses for display. The code is given freely with no copyright notices and is in the public domain so I would say yes - go ahead and use it.

If you want to be absolutely sure, email the site admins to check.

Dave

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)

gtr197129-Nov-09 5:14

29-Nov-09 5:14

Hello! I'm new to C# programming and I have an issue with getting a textbox string to convert to a double.

I'm not sure where I went wrong in the following code, but MS Web Developer isn't liking it:

dEarn = Convert.ToDouble(sEarnings);
dHealth = Convert.ToDouble(txtHealth.Text);
d401k = Convert.ToDouble(txt401k.Text);

I'm trying this two ways: 1) Where "sEarnings" is a string equal to textbox input, and 2) Where I simply try to convert the textbox input directly. Neither way seems to work, and to add clarity, all of this is happening under a Button_Click void.

Thanks!

Dave Kreskowiak29-Nov-09 5:26

Dave Kreskowiak

29-Nov-09 5:26

Have you looked into using Double.TryParse() instead?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

gtr197129-Nov-09 5:33

29-Nov-09 5:33

Tried dEarn = Double.TryParse(sEarnings);... MS Web Developer complains "No overload for method 'TryParse' takes '1' arguments"

Richard MacCutchan29-Nov-09 5:46

Richard MacCutchan

29-Nov-09 5:46

Try reading the documentation[^].

PIEBALDconsult29-Nov-09 5:50

PIEBALDconsult

29-Nov-09 5:50

Don't use a TextBox for numeric values; use a NumericUpDown.

gtr197129-Nov-09 5:56

29-Nov-09 5:56

This is a project specifically utilizing textbox input. Many tools aren't available to me yet as I am a beginner with C#, though I do have some VB experience. So I don't necessarily know or understand all of the possible ways around an issue.

Basically, think of the most common, elementary way you'd handle this problem and that is likely my answer. Big Grin | :-D

Natza Mitzi
Analysis Studio Statistical Analysis Software

Natza Mitzi29-Nov-09 6:10

Natza Mitzi

29-Nov-09 6:10

Double.TryParse and dont forget formatting and the Culture you are addressing

gtr197129-Nov-09 6:20

29-Nov-09 6:20

Thanks, Natza - but I don't understand what you mean by "culture".

Here's what I'm working with, all under a Button_Click void. I've got an ASP page interacting with this back code. The user enters a number string in a textbox, I want to convert that string into a double and do a calculation. I don't want to test the input here for a boolean yes/no, I want to convert the string a use it.

-------------------
protected void btnCalc_Click(object sender, System.EventArgs e)
{

String sName = (txtName.Text);
String sEarnings = (txtEarnings.Text);
String sHealth = (txtHealth.Text);
String s401k = (txt401k.Text);

dEarn = Convert.ToDouble(sEarnings);
dHealth = Convert.ToDouble(txtHealth.Text);
d401k = Convert.ToDouble(txt401k.Text);

<other code,="" etc....="">

}
--------------------------

Richard MacCutchan29-Nov-09 6:23

Richard MacCutchan

29-Nov-09 6:23

I gave you the answer; see my message above.

Natza Mitzi
Analysis Studio Statistical Analysis Software

Natza Mitzi29-Nov-09 6:32

Natza Mitzi

29-Nov-09 6:32

Hi,
When converting from or to strings (even calling ToString(), you should ALWAYS use the culture in which you intend the formatting for. A general rule of thumb is always use English (us or uk) for internal stuff such as application logs and exporting/importing internal data, this way even when your software or data is moved between computers with different languages it will work. Use the UI culture and number formatting in the UI layer for UI interaction.

Look at this horror:
10.000
An American or english computer will read this as 10$
and a french, german and others will read this as 10000$
Fun fun fun Smile | :)

I think your code should look something like this:

String sEarnings  = txtEarnings.Text;
           double earnings;

           //Use the System.Threading.Thread.CurrentThread.CurrentUICulture.NumberFormat
           //since the text box string data has the UI culture
           bool earningsParseOk = Double.TryParse(
               sEarnings, System.Globalization.NumberStyles.Any,
               System.Threading.Thread.CurrentThread.CurrentUICulture.NumberFormat,
               out earnings);


           //check whether all parsing went ok
           //if not alert
           if (earningsParseOk)
           {
               //go go go
           }
           else
           {
               //error
           }

PIEBALDconsult29-Nov-09 11:39

PIEBALDconsult

29-Nov-09 11:39

gtr1971 wrote:
think of the most common, elementary way you'd handle this problem and that is likely my answer

Mine too -- a NumericUpDown.