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How to validate textbox in Visual C++?

Posted on 2004-10-18
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Last Modified: 2010-04-24
Can anyone please tell me how to go about validating textboxes in visual C++? I notice there's an "addValidating" event that we can call, but how should I use it? I basically want to make sure that the user does not leave a textbox blank, if they do I want to highlight that textbox a different color and tell them to fill it in...
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Question by:jade03
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Svetlin_Panayotov earned 200 total points
ID: 12344851
You can have some code like this:
in your InitializeComponent() method:
this->textBox1->Validating += new System::ComponentModel::CancelEventHandler(this, textBox1_Validating);

and add this method:

private: System::Void textBox1_Validating(System::Object *  sender, System::ComponentModel::CancelEventArgs *  e)
             {
                   System::Boolean isValid = false;
                   //Do your validation here...
                   if (isValid == false)
                   {
                         textBox1->set_BackColor(System::Drawing::Color::Red);
                         e->set_Cancel(true);
                   }
                   else
                   {
                         textBox1->set_BackColor(System::Drawing::SystemColors::Window);
                   }
             }

Svetlin
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Author Comment

by:jade03
ID: 12348491
Svetlin,

I tried that...for one thing, visual c++ doesn't seem to have the "Validating" method...it has an add_validating method instead....when I use the add_validating method, it complains of the way I call textBox1_Validating (exactly like how you called it above, with no params). It says since textBox1_Validating is defined to take 2 params, I couldn't call it w/ no args...
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by:Svetlin_Panayotov
ID: 12349127
The code I posted works fine for me - but with VS 2003.Can't test it on 2002 right now.
What version of VS are you using?
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Author Comment

by:jade03
ID: 12350034
Svetlin,

Thanx! my version is also 2003. I guess when I typed in this->textBox1-> and didn't see the "Validating" method in the list I thought it wasnt' available, so I assumed it's the "add_Validating" method instead...but when I tried calling "Validating" anyways the way you did it, it compiles and is good.

Thanx again! :)

jade
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LVL 6

Expert Comment

by:Svetlin_Panayotov
ID: 12350334
It happens :)
Good luck with your project and happy coding :)

Svetlin
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