Can't open a Modal (showdialog) form

[elmbrook]

I am unable to open a child form as a modal form.

Here is my scenario

I have a MainForm which is a toplevel form.
Inside the MainForm I have a Toolbar Form which is a child.
From the Toolbar Form I call another child form.
From that child form I need to call myModalForm.

I have tried:

myModalForm myform = new myModalForm ();
myform.TopLevel = true;
myform.MdiParent = this.mdiparent;
myform.ShowDialog();

Result: 'Form that is not a top-level form cannot be displayed as a modal dialog box. Remove the form from any parent form before calling showDialog.'

So I thought I would close the existing form first and then call the modal form

this.close();
myModalForm myform = new myModalForm ();
myform.TopLevel = true;
myform.ShowDialog();

Result: IT works...however, it is not inside the top level form.

So I thought I would open an instance of the MainForm and set that as the MDIParent

this.Close(); //Close Current Form
MainForm topform = new MainForm(); // Create new instance of MainForm
myModalForm myform = new myModalForm ();
topform.TopLevel = true;
myform.MdiParent = topform;
myform.ShowDialog();

Result: 'Form that is not a top-level form cannot be displayed as a modal dialog box. Remove the form from any parent form before calling showDialog.'

Can anyone help me get a modal form within my toplevel MainForm?

Thanks

[ThatThatGuy]

You cannot access a the parent form without closing the modal form...

it needs to be closed first...

although you should never use modal forms in mdi application,.... it should always be modaless...

Modal forms should only be for dialog forms

[elmbrook]

I think you may have mis-read the question.
I would like to open a modal form (dialog form) within my top level form.

They must fill out the information on my modal form first before they can continue.

Does that make sense?

[elmbrook]

I have found a work around but it is not pretty.

What I have done is open the modal form from the MainForm. I have to call this method from my Child form. This works however, for every modal form in my application, I have to setup a new entry in my MainForm.

public void Open_Modal_Form(string formname)
{
switch (formname)
{

case "myModalForm":
myModalForm myform = new myModalForm ();
myform.ShowDialog(this);
break;
}
}