C++ Windows Forms application unhandled exception error when textbox empty

Question

I\'m building a temperature conversion application in Visual Studio for a C++ course. It\'s a Windows Forms application.

My problem is, when I run the application if I d

Answer 1

This will check that the entry in your textbox is convertible to a number.

double val;
bool result = System::Double::TryParse(txtFahrenheit->Text,val);

if (result)
{
    //Converted successfully, you can use val
}
else
{
    //Error
}