Open the closed form

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I'm wondering how I can open again the closed form from using this.Close(). Every time I'm trying to open the closed form using Mainmenu.Show(), the exception throws an error "cannot access the disposed object. Object name: Mainmenu".

How can I open it again?

When the Close method is called on a Form you cannot call the Show method to make the form visible, because the form's resources have already been released aka Disposed. To hide a form and then make it visible, use the Control.Hide method.

from MSDN

If you want to re-open a form that has been closed, you need to re-create it again the same way you created-it at first:

YourFormType Mainmenu=new YourFormType();
Mainmenu.Show();

Open Form, composition is basically the opposite. There is generally no single focus, and the image will seem to “run off” the edges. It's also more dynamic, and busier, with a sense of movement. Form is the physical structure or pattern of a poem. The main forms of poetry are open form and closed form. Line length, rhythm patterns and rhyme structures all contribute to poetic form.

I presume that you have a main form, which creates a non-modal child form. Since this child form can be closed independently from the main one, you can have two scenarios:

  1. Child form hasn't been created yet, or it was closed. In this case, create the form and show it.
  2. Child form is already running. In this case, you only need to show it (it may be minimized, and you will want to restore it).

Basically, your main form should keep track of the child form's lifetime, by handling its FormClosed event:

class MainForm : Form
{
    private ChildForm _childForm;

    private void CreateOrShow()
    {
        // if the form is not closed, show it
        if (_childForm == null) 
        {
            _childForm = new ChildForm();

            // attach the handler
            _childForm.FormClosed += ChildFormClosed;
        }

        // show it
        _childForm.Show();
    }

    // when the form closes, detach the handler and clear the field
    void ChildFormClosed(object sender, FormClosedEventArgs args)
    {
        // detach the handler
        _childForm.FormClosed -= ChildFormClosed;

        // let GC collect it (and this way we can tell if it's closed)
        _childForm = null;
    }
}

What is open and closed composition of art?, Films present the visible world in two major ways, the closed (Lang style) and open (Renoir) form. These two possibilities are to be understood as ideal types. Open and Closed Form in Film Films present the visible world in two major ways, the closed (Lang style) and open (Renoir) form. These two possibilities are to be understood as ideal types.

You cannot Show a closed form. You can call this.Hide() to close the form. Later you can call form.Show();

Either that or you need to create the form all over again.

Closed-Form Solution -- from Wolfram MathWorld, In mathematics, a closed-form expression is a mathematical expression expressed using a Closed-form numbers can be studied via transcendental number theory, in which a major result is the Gelfond–Schneider theorem, and a major open  Closed form poetry, also known as fixed form, consists of poems that follow patterns of lines, meter, rhymes, and stanzas, whereas open form poetry does not. When writing a closed form poem, the

Small addition to the smart presented code Above

private void CreateOrShow()
{
    // if the form is not closed, show it
    if (_childForm == null || _childFom.IsDisposed ) 
    {
        _childForm = new ChildForm();

        // attach the handler
        _childForm.FormClosed += ChildFormClosed;
    }

    // show it
    _childForm.Show();
}

// when the form closes, detach the handler and clear the field
void ChildFormClosed(object sender, FormClosedEventArgs args)
{
    // detach the handler
    _childForm.FormClosed -= ChildFormClosed;

    // let GC collect it (and this way we can tell if it's closed)
    _childForm = null;
}

Open and Closed Form in Film, Open Form: -when you want to delay your thesis rather than announce it in the introduction to create suspense; a delayed thesis structure is less combative  closed form A self-contained or explicitly limited form; having a resolved balance of tensions, a sense of calm completeness implying a totality within itself. open form A form whose contour is

Closed-form expression, These are called "open" or "closed" forms. When looking at a poem's form, you can observe the following; with more than one of these in a poem, there is  OPEN FORM TO CLOSED FORM WRITING STYLES From The Allyn and Bacon Guide to Writing CLOSED FORM ----- OPEN FORM Top Down Thesis Prose Delayed Thesis Prose Thesis Seeking Prose Theme Based Narrative Thesis explicitly stated in introduction Thesis appears near end Essay organized around a question rather than a thesis Often has an…

[PDF] Open Form to Closed Form Writing Styles, The form, which is the structure and shape of a poem, usually plays a crucial role. There are two Duration: 5:55 Posted: Jan 28, 2016 The terms "open" and "closed" refer to either the absence (in the case of the former) or the presence (in the case of the latter) of distinct elements of poetic form and structure in a poem.

What is the difference between "closed form" poetry and "open form , Closed form confines all the relevant information of a painting, or in our case a film, inside the frame. In opposition to this is open form, which  Open form is a term coined by Heinrich Wölfflin in 1915 to describe a characteristic of Baroque art opposed to the "closed form" of the Renaissance (Wölfflin 1915, chapter 3).

Comments
  • my intention is to close the form and reopen it. so how can i open the closed form?
  • if you want to re-open a form that has been closed, you need to re-create it again the same way you created-it at first: YourFormType Mainmenu=new YourFormType(); Mainmenu.Show()
  • Thanks for the submission, Azzam. Please not that it's generally preferred to edit existing answers rather than add new ones for minor updates.
  • Brett Wolfington Thank you For informing me, Best Regard