hi you! you can using code snipet below :d hope this help you
Public Sub MakeChecked(ByVal GridView As DataGridView, ByVal ColumnName As String)
Dim UnCheckedItems = From Rows In GridView.Rows.Cast(Of DataGridViewRow)() Where CBool(Rows.Cells(ColumnName).Value) = False
For Each item In UnCheckedItems
item.Cells(ColumnName).Value = True
Next
End Sub
Public Sub MakeUnChecked(ByVal GridView As DataGridView, ByVal ColumnName As String)
Dim UnCheckedItems = From Rows In GridView.Rows.Cast(Of DataGridViewRow)() Where CBool(Rows.Cells(ColumnName).Value) = True
For Each item In UnCheckedItems
item.Cells(ColumnName).Value = False
Next
End Sub