ListBox DoubleClick -> Form.Close error

[Guest]

I am using VS.NET 2003 and am having an interesting issue with a Listbox control. Essentially, I have a form with a listbox on it. In the listbox doubleclick event I would like to do some processing and then close the form. However, I receive an error (Cannot access a disposed object named "ListBox".) after my doubleclick code has processed.

/* ***************************
private void listBox1_DoubleClick(object sender, System.EventArgs e)
{
this.Close();
}
****************************/

To reproduce, create a form, drop a listbox on it, assign the doubleclick event and put "this.Close();" in the handler. Does anyone know if there is a fix to this issue? There are workarounds, best I've seen so far is:
/****************************
private void listBox1_DoubleClick(object sender, System.EventArgs e)
{
this.BeginInvoke( new EventHandler( CloseForm ) );
}

private void CloseForm( Object sender, EventArgs e )
{
this.Close();
}
***********************************/

I think this must be an error in how the message processing is handled within the list box control itself?

Thanks,
Joe

 

[Shakir Hussain]

Joe,

I tried a sample like you described. Form closes properly after doubleclick
in listbox. No issues at all.

--
Shak
(Houston)

I am using VS.NET 2003 and am having an interesting issue with a Listbox

control. Essentially, I have a form with a listbox on it. In the listbox
doubleclick event I would like to do some processing and then close the
form. However, I receive an error (Cannot access a disposed object named
"ListBox".) after my doubleclick code has processed.

/* ***************************
private void listBox1_DoubleClick(object sender, System.EventArgs e)
{
this.Close();
}
****************************/

To reproduce, create a form, drop a listbox on it, assign the doubleclick

event and put "this.Close();" in the handler. Does anyone know if there is
a fix to this issue? There are workarounds, best I've seen so far is:

/****************************
private void listBox1_DoubleClick(object sender, System.EventArgs e)
{
this.BeginInvoke( new EventHandler( CloseForm ) );
}

private void CloseForm( Object sender, EventArgs e )
{
this.Close();
}
***********************************/

I think this must be an error in how the message processing is handled

within the list box control itself?

 

[Shakir Hussain]

I am using .VS.NET 2003.

code is pretty simple.

1. Created new c# project and it loaded default form "Form1"
2. I added listbox with default name listBox1
3.Added double click event
4. Added one line of code in that event
this.Close()

When i double clicked on listbox everything works fine. Form closed properly
without any errors.