i want to do the following:

1. Click a button on Main menu.
2. Close main menu ( I would use hide if possible)
3. Open form2
4. Open other forms and hide or close the previous form. \\ will not do now
5. Eventually able to go back to Main form.

my main form code: public partial class EntryForm : Form
{
//EventClass myEventClass = new EventClass();
...