how to customize a menu bar in vb.net

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VB

MS-Access

Hello guys developers, I m developing a system using visual basic studio 2010 with access database, I'm using data bound control not ado.net code but data bound source code.
I m using tabcontrol and menu bar, I would like to know what I can put between code for different forms so that as I'm editing using menu so that the change of one will not change others, I'm fearing that when I click on delete that I may find myself delete others data from different pages of tabcontrol.

I would like some to help, actually let me send you how there are organized.

'add(menu bar)
    Private Sub ToolStripMenuItem6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem6.Click
        MembersBindingSource.AddNew()
        GendersBindingSource.AddNew()
        CoursesBindingSource.AddNew()
        FacultiesBindingSource.AddNew()
        CategoriesBindingSource.AddNew()
        LendingQueryBindingSource.AddNew()
        loadpic()
        BooksBindingSource.AddNew()
        AuthorsBindingSource.AddNew()
        PublishersBindingSource.AddNew()
        AmountBindingSource.AddNew()
        SuppliersBindingSource.AddNew()
        User_detailsBindingSource.AddNew()
        ReturnBindingSource.AddNew()

 'save(menu bar)
    Private Sub ToolStripMenuItem7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripMenuItem7.Click
        
        MembersBindingSource.EndEdit()
        MembersTableAdapter.Update(CUULibDBDataSet.members)
        Validate()
        CoursesBindingSource.EndEdit()
        CoursesTableAdapter.Update(CUULibDBDataSet.courses)
        Validate()
        FacultiesBindingSource.EndEdit()
        FacultiesTableAdapter.Update(CUULibDBDataSet.faculties)
        Validate()
        GendersBindingSource.EndEdit()
        GendersTableAdapter.Update(CUULibDBDataSet.Genders)
        Validate()
        CategoriesBindingSource.EndEdit()
        CategoriesTableAdapter.Update(CUULibDBDataSet.categories)
        Validate()
        BooksBindingSource.EndEdit()
        BooksTableAdapter.Update(CUULibDBDataSet.books)

    End Sub