vc++.net TextBox

I am trying to implement a checkbox enabled textbox. I hit the backspace button to the beginning where there are no more characters left, and an error gets thrown. Im trying to use exception handling to eliminate the error but it is not working. This is the code i have:

Code:

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private: System::Void textBox3_TextChanged(System::Object *  sender, System::EventArgs *  e)
                {
                       
                                labelboardsub->Text = String::Concat(S"Subtotal: $ ", (120. * Double::Parse(textBox3->Text)).ToString()  );
               
                                double x;
                                try
                                {
                                        x=this->textBox3->TextLength;
                                }
                                catch(FormatException *)
                                {
                                        textBox3->TextLength==0;
                               
                                       
                                }
                }

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Quote:

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Originally Posted by VaLDeZ++

I am trying to implement a checkbox enabled textbox. I hit the backspace button to the beginning where there are no more characters left, and an error gets thrown. Im trying to use exception handling to eliminate the error but it is not working. This is the code i have:

Code:

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private: System::Void textBox3_TextChanged(System::Object *  sender, System::EventArgs *  e)

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Wrong forum. You want the Managed C++ forum to ask questions like this. The code you wrote is part of Managed C++, and this forum only deals with non-Managed VC++ libraries, code, and language syntax.

Regards,

Paul McKenzie

[ redirected ]

Where is the exception thrown from? If you don't know exactly, go to Debug > Exceptions and check "Common Language Runtime Exceptions" and then run your application in the debugger. It will stop at the line that throws.

Double:: Parse may throw exception if argument cannot be converted to double type. Catch this exception and handle it according to your requirements.
textBox3->TextLength - this line doesn't throw exception, you make exception handling in the wrong place.

hi,

trying to implement a checkbox enabled textbox. I hit the backspace button to the beginning where there are no more characters left, and an error gets thrown. Im trying to use exception handling to eliminate the error but it is not working.



regards,
phe9oxis,
http://www.guidebuddha.com