Form.Show Method (IWin32Window)
Shows the form with the specified owner to the user.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The form being shown is already visible.
The form specified in the owner parameter is the same as the form being shown.
The form being shown is disabled.
The form being shown is not a top-level window.
The form being shown as a dialog box is already a modal form.
The current process is not running in user interactive mode (for more information, see UserInteractive).
You can use this method to display a non-modal form. When you use this method, the Owner property of the form is set to owner. The non-modal form can use the Owner property to get information about the owning form. Calling this method is identical to setting the Owner property of the non-modal and then calling the Show() method.
Available since 2.0