how to read a property of disposed object

Question

Hi there I am new to this forum so hi to every one.
I have a problem with an application I am developing an application.
The application is suppose to call a form.showdialog() method to show the form. Th eform should download a package. But the problem is that when I cancel the download and try to see a property IsDownloadComplete it says the object is disposed. How can I read a property from that form?
thanking in anticipation

Alan · Answer

In an attempt to model it as simply as possible I've just quickly created an app with two forms. The start up form has a button and a label. When the button is pressed Form2 opens up. The second (modal) form just has a button which when pressed toggles a property. Here's the code: public partial class Form1 : Form { private Form2 f2; public Form1() { InitializeComponent(); } private void button1_Click( object sender EventArgs e) { DialogResult dr = f2.ShowDialog(); if (dr == DialogResult .Cancel) { this .label1.Text = f2.IsButtonPressed.ToString(); } } private void Form1_Load( object sender EventArgs e) { f2 = new Form2 (); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); } public bool IsButtonPressed = false ; private void button1_Click( object sender EventArgs e) { IsButtonPressed = !IsButtonPressed; } } When the app is run and the Close button on Form2 is clicked (thereby returning a DialogResult of cancel) the label on Form1 reflects the current state of the property no matter how many times Form2 is opened. An 'accessing a disposed object' exception is never thrown. Can you see any essential difference in inter-form communication between your app and this ?

Umair P · Answer

IsDownloadComplete is property on the form that is of bool type and it is set to true if download is 100% other wise it remains false. now the problem is that the compiler is not throwing any exception but showin message that its trying to access a disposed object.

Alan · Answer

Are you sure that it's the 'objDownLoad' form that's been disposed of and not some other object on that form which is accessed by the IsDownloadComplete property?

Umair P · Answer

try { objDownload.ShowDialog();// here is the problem. it tries to access the obj that is already dead. if (objDownload.IsDownloadCompleted) { return true; } else { return false; } } catch (Exception e) { //System.Windows.Forms.MessageBox.Show( MY Message ); return false; } above is the code where debugger shows error there is nothing in the form_close() event. Note: I am using cancel button.

Alan · Answer

When you open a form modally by calling its ShowDialog() method then even if you click the Close button the form instance is not actually disposed of - it's just hidden. So if the IsDownloadComplete property is on the modal form then it should still be callable unless you've manually called the Dispose() method somewhere such as from the FormClosed eventhandler. I'd therefore check your code to see whether or not this is the case.