Question

Bassicly im creating a program that allows the user to enter values and if the values exceed a certain amount then disable a button that was on a different form. But im unsure how to access its buttons control. I thought it would be something like this? Thanx

 if(value>120)
 {
  Form3 form3 = new Form3();
  Button.Disable();
  this.close();
 }

Answer 1

Your request is to disable a button that was on another form – from reading that I assume the form already exists. By creating a new instance:

Form3 form3 = new Form3();

You’re creating a new instance of Form3 so you’ll never disable a button on a form that was already visible.

You’ll have to make the current form aware of the instance of Form3 to be able to change anything there. Here are a few ways to make them interact:

• Store these values in a separate object and make your forms react on changes through events for example
• Provide a reference to the instance of Form3 upon creating or Show()ing “this” form
• Keep a reference to each created form in a static class

Also keep in mind having multiple related forms active at the same time may confuse your end-user.