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Message: [QUOTE="John Smith, post: 1581988"] Why do I get above error message while executing this code: Public Sub DropDown_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Dim list As DropDownList = CType(sender, DropDownList) Dim cell = CType(list.Parent, TableCell) Dim item = CType(cell.Parent, DataGridItem) Dim index = item.ItemIndex Dim ds As DataSet ds = DataGrid1.DataSource Dim row As DataRow row = ds.Tables(0).Select("ID = '" + item.Cells(0).Text + "'")(0) '<--- ERROR End Sub [/QUOTE]