C# Error

[LostDream]

Hey, I'm using visual studio 2010 to code a C# program and it's thrown up this error

String was not recognized as a valid Boolean.

in relation to this code...

I can't figure out why, I've tried to error help but I can't make sense of it because I have two versions of the code and one words and the other doesn't.

The code is in relation to this code

if (theActivityBooking == null) //If new bookings are to be changed then display the below and change the below
                theActivityBooking = new ActivityHoliday(cmbWkOfHol.Text, txtName.Text, txtCusAddress.Text, [B] Convert.ToString(txtChildren.Text)[B], cmbActivityType.Text, Convert.ToBoolean(comboUnder16.Text));
            else
            {   //if editing an existing booking
                theActivityBooking.name = txtName.Text;
                theActivityBooking.week = cmbWkOfHol.Text;
                theActivityBooking.address = txtCusAddress.Text;
                theActivityBooking.children = Convert.ToString(txtChildren.Text);
                theActivityBooking.activitytype  = cmbActivityType.Text;
                theActivityBooking.CheckAge  = ageconvert(comboUnder16.Text);


            }

It's throwing up the error for this line in particular Convert.ToString(txtChildren.Text)

Thanks for any help you can provide

[CreganTur]

My main question is why you're converting the Text of a textbox to a string. It's already a string when you pull the Text. Can't really suggest much more than that as I don't know the expected data types of the parameters for the ActivityHoliday class.

[LostDream]

The text going into the txtChildren text box is a number and when I enter it, it takes me straight to that line of code and throws up the error

[Nerfpl]

Convert.ToBoolean(comboUnder16.Text)

Most likely.

If comboUnder16 is checkbox use comboUnder16.checked

[LostDream]

Hi sorry for the confusion, I've just been looking at the code for hours and can't figure it out.

Combounder16 is a combo box, and txtChildren is a text box, the txtChildren inputs numbers and when I try to add the children to a list via the text box the error

the number of chidren being entered is declared as a string and the under16 is declared as a boolean, the error I now get is

: String was not recognized as a valid Boolean. Relating to that same line of code.

[LostDream]

SOLVED IT! Thanks anyway.

Sometimes it's good to take a break and then come back to it without stressing!

[TheGreatCthulhu]

It's always a good idea to share the solution, so that this thread can be helpful to other people having the same problem.

Anyway, the reason is that C# allows only certain strings to be converted to bool.
See the docs for the Boolean.Parse() method at MSDN.

Here's a quote of the example code output:

// 'True' --> True
// 'False' --> False
// 'true' --> True
// 'false' --> False
// ' true ' --> True
// Cannot parse '0'.
// Cannot parse '1'.
// Cannot parse '-1'.

Basically, it works only if it says "true" or "false" in some form (caps and white space are ignored).

Now, if you need to convert numbers to bool, you can either write a simple if-else routine yourself, or use the Convert.ToBoolean() static method (after parsing the string to a number, of course).

Return Value
Type: System.Boolean
true if value is not zero; otherwise, false.