Move and delete checked rows in database using Entity Framework in ASP.Net

Thanks to Pandeyism for helping me we these codes

https://www.aspforums.net/Threads/748564/Move-and-delete-multiple-rows-in-database-table-using-EntityFramework-in-ASPNet/?s=2#Replies

But i whant to a a dynamic checkbox to the view and move and delete it based on the checked rows

what am i doing wrong here

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Me.BindGrid()
    End If
	
	 Dim checkBoxColumn As New DataGridViewCheckBoxColumn()
        checkBoxColumn.HeaderText = ""
        checkBoxColumn.Width = 30
        checkBoxColumn.Name = "check"
        DataGridView1.Columns.Insert(0, checkBoxColumn)
        DataGridView1.AllowUserToAddRows = False
End Sub
 
Private Sub BindGrid()
    Dim test As TestEntities = New TestEntities()
    gvMembsers.DataSource = From m In test.members Select m
    gvMembsers.DataBind()
End Sub
 
Protected Sub btnInsert_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim test As TestEntities = New TestEntities()
	
   Dim isSelected As Boolean = Convert.ToBoolean(row.Cells("check").Value)
   
    Dim memberOldRecord = (From o In test.members Where isSelected = True Select o).ToList()
		If isSelected Then
	
			For j As Integer = 0 To memberOldRecord.Count() - 1
				Using test1 As TestEntities = New TestEntities()
					Dim ol As Oldmember = New Oldmember With {
						.name = memberOldRecord(j).name,
						.age = memberOldRecord(j).age,
						.dob = memberOldRecord(j).dob,
						.location = memberOldRecord(j).location
						}
					test1.AddToOldmembers(ol)
				test1.SaveChanges()
				End Using
			Next
		Me.BindGrid()
		End if 
 
    Using test2 As TestEntities = New TestEntities()
        Dim mem = (From c In test2.members Where c.age >= 20 Select c).ToList()
        For i As Integer = 0 To mem.Count() - 1
            Dim member As member = mem(i)
            test2.DeleteObject(member)
            test2.SaveChanges()
        Next
        gvOldmembers.DataSource = mem
        gvOldmembers.DataBind()
        Me.BindGrid()
    End Using
End Sub

will appriciate if the logics is explain please