vb.net - DataGridView to Datatable

Convert DataGridView Source to Datatable
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dim dt as New DataTable
dt = TryCast(dgv.DataSource, DataTable)

if, the datasource is BindingSource, then
use this:

dim bs as BindingSource
bs = TryCast(dgv.DataSource, BindingSource)
dim dv as New DataView
dv = bs.SyncRoot
dt = dv.ToTable


if, the Datasource is any of above, use this:

dt = New DataTable
Dim bs As New BindingSource
If TypeOf dgv.DataSource Is DataTable Then
 dt = TryCast(dgv.DataSource, DataTable)
Else
   bs = TryCast(dgv.DataSource, BindingSource)
   dv = New DataView
   dv = bs.SyncRoot
   dt = dv.ToTable
End If