Question

I’m getting ObjectDisposedException was unhandled with message Cannot access a disposed object.

This happens when initialize this child form at the beginning of my class by MyForm myForm = new MyForm(); and then adding some text to my text box of that form by myForm.txtBox.AppendText("Text"); and then opening my new form my form by using some button with code myForm.Show();. Now when my job is done I can close the form. Now, when I want to display the data again I’m getting that exception.

I want to keep the content of text box in my new form, but it seems like there is a problem that I haven’t disposed everything in it.

How to avoid this so I can view the new forms content any time I press button?

Answer 1

From the MSDN documentation on Form.Close:

When a form is closed, all resources created within the object are
closed and the form is disposed. You can prevent the closing of a form
at run time by handling the Closing event and setting the Cancel
property of the CancelEventArgs passed as a parameter to your event
handler. If the form you are closing is the startup form of your
application, your application ends.

You could capture the Form.Closing event on the form, cancel the event, and hide the form instead of Closeing it.