Use two MDI Form in the same Project

Hi,

My Project start with Login Form. MDI_Main_Form open when Login is success. I want to open another MDIChildForm when I click an item in ToolStripMenu in MDI_Main_Form.

Dim NewMDIChild As New Admin_Panel
NewMDIChild.MdiParent = Me 'Error in this line. Admin_Panel is a MDIChild Form
NewMDIChild.Show()
NewMDIChild.Dock = DockStyle.Fill

The Error Message is "Form cannot be both an MDI child and MDI parent"

How can I solve this error?

Thanks.

That design doesn't make much sense. In the typical MDI scenario, one form acts as kind of a background and container for all other forms. From your description, MDI_Main_Form is the parent form, and Admin_Panel is a child form. However, based on the error, you have MDI_Main_Form as a child to something else, which it shouldn't be.