How to check if a TextBox number is valid?

[curzondax]

I use a Convert::ToDouble(this->TextBox1->Text) to get a double to use later; how can one check if it's valid? e.g. if it's left empty or there's a dot, crash.

[cilu]

[ redirected thread ]

[cilu]

Well, Convert::ToDouble throws an exception if the conversion fails. You have to try-catch that exception.

A better approach is to use Double::TryParse. It does not throw an exception, but returns true or false to indicate an error in the conversion.