Databases
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    <p>Have you set the <code>MainForm</code> to be an <code>MDIContainer</code>? To do this set its <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.ismdicontainer%28v=vs.71%29.aspx" rel="nofollow">IsMdiContainer</a> property to true; Also check it has <code>File</code> and <code>Window</code> top-level menu items and <code>New</code> and <code>Close</code> menu items. (The tutorial suggests this, I know it should have a <code>Window</code> menu item at least).</p> <p>Have a look at this tutorial for more guidance: <a href="http://msdn.microsoft.com/en-us/library/aa984329%28v=vs.71%29.aspx" rel="nofollow">Creating MDI Child Forms (MSDN)</a></p> <p><strong>EDIT:</strong> Looking at it more closely, it seems you are creating a new instance of MainForm, and trying to show the form as a child of that instance, as opposed to showing it in the existing MainForm. I assume you already have an instance of MainForm open at this point? And assuming the OutputForm and AddAnime forms are children of MainForm you could call the existing instance's method like this:</p> <pre><code>private void NewAnime_Click(object sender, EventArgs e) { this.ParentForm.mShowForm(2); this.Close(); } </code></pre> <p>but ideally you should have an event on DataBaseOutput that MainForm listens to, and shows the new Form when the event is raised. See here for more info <em>(it talks about user controls and not child forms, but the principle is the same)</em>:</p> <p><a href="http://www.codeproject.com/KB/cs/agusercontrol.aspx" rel="nofollow">Calling parent form functions from a user control</a></p>
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    1. COYes, it is an MDIContainer and it's all there. The idea is to open a new child (AddAnime) and fill it in, then close it again, but I want it inside the MDIContainer. Anyway, I need to call a new child from a child, and I can't seem to make that happen properly. I can call a child from the main form, it works, but I can't call the child from the other child.
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    2. CO@ your edit: Ok, thanks, but where do i need to show the DataBaseOutput form that MainForm is it's parentform? because I can't run it right now.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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