Validate status checkbox vb asp net codebehind

hi i need to implement the following rule as validate that there is an active checkbox least in the gridview

and you can not disable

and if there is an active checkbox minimum (1 true) in the gridview can activate others that are inactive (0 false)

sorry for my english :)

select COUNT(*) enabled from checkbox where checkbox.Enabled = 1

 Dim total As New checkboxdal
 Dim totalcheckboxActive = total.totalCheckboxEnabled(UC)

If totalcheckboxActive > 1 Then

            dt.Enabled = chkActive.Checked

            Dim Data = ad.updateAspects(UC, dt)

            SetResult(String.Format("update '{0}' successful", dt.Enabled ))
        Else
          Response.Write("<script>alert('You must have at least one checkbox active.');</script>")
            End If

        End If