ดึงข้อมูลโดยใช้ checkbox ใน GridViewเป็นตัวอ้างอิงในรายงาย Crystal report

List<CheckBox> cb = new List<CheckBox>();

(from gvr in GridView1.Rows.Cast<GrdiViewRow>()
 select gvr).ToList().ForEach(gvr => {
    (from c in gvr.Cells[0].Controls.Cast<Control>()
     where c.GetType() == typeof(CheckBox)
     select c).Select(c => (CheckBox)c).ToList().ForEach(c => cb.Add(c));
 });

foreach(CheckBox c in cb)
{
   // do something
}

Dim cb As New List(Of CheckBox)()

(From gvr In GridView1.Rows.Cast(Of GrdiViewRow)()gvr).ToList().ForEach(Function(gvr) 
(From c In gvr.Cells(0).Controls.Cast(Of Control)() Where c.[GetType]() = GetType(CheckBox)c).[Select](Function(c) DirectCast(c, CheckBox)).ToList().ForEach(Function(c) cb.Add(c))

End Function)

		' do something
For Each c As CheckBox In cb
Next