IsolatedStorageFileStream Enquiry

Question

Hey all, I got a question in relation to the IsolatedStorageFileStream.... I was wondering how I capture the path of the document after my textbox displays the document name.

OpenFileDialog dlg = new
 OpenFileDialog();
            dlg.Filter = @"Picture File (*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp 
                            | All Files (*.*)|*.*"
;
            if
 (dlg.ShowDialog() == true
)
            {
                txtFileUpload.Text = dlg.SafeFileName;
            }

For example : I am able to do this using

 FileStream (txtFileUpload.Text, FileMode.Open, FileAccess.Read);

But with IsolatedStorageFileStream, it would display FileNotFoundException.

So I was wondering, is there a way of which I could write IsolatedStorageFileStream much like the FileStream displayed above??

I am learning the C# language and I hope I could learn this as most of the examples that I have seen online have hardcoded the path like "MyFile.txt", which I do not wish for that.

Thank you for your time.