Cannot Access a Disposed Object Error

Question

I have a WinForms app which has been running without any issues till date. All of a sudden, when I ran the app today, I am getting this error:

Cannot Access a Disposed Object  "\Object Name"\

 

This is occuring specifically at this line of code:

System.Windows.Forms.Form f = new System.Windows.Forms.Form();

return System.Windows.Forms.MessageBox.Show(f, text, caption, buttons, icon);

 

I am not sure why this should occur now, given the fact that it was working all these days.

 

Answer 1

You cannot call Show on a  previously shown and closed form. If you need that, handle the Closing event on the child form, and hide it instead of actually closing it.

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http://blog.voidnish.com

Answer 2

Hi iconabhi,

 

I agree with Nishant. That error only occurs when the Form is closed(disposed). You can add following check to avoid this kind of error.

if (f.IsDisposed)

{

     f = new System.Windows.Forms.Form();

}

MessageBox.Show(f, "abc", "bcd", MessageBoxButtons.OK);

 

Does it work? Please feel free to tell me if you meet any difficulties.

 

Sincerely,

Kira Qian

MSDN Subscriber Support in Forum

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Answer 3

I am writing to check the status of the issue on your side. Could you please let me know if the suggestion works for you? If you have any questions or concerns, please feel free to let me know. I will be more than happy to be of assistance.

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Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework!

Answer 4

Sorry..I was away for a little while now. Yes, I followed Nishanth's solution and looks like it's working now. Thanks for the followup !