You are creating a Web Form. The Web Form allows users to rename or delete products in a list. You create a DataTable named dtProducts that is bound to a GridView. DataTable has the following four rows. dtProducts.
Rows[0]["ProductName"] = “Soap”;dtProducts.
Rows[1][“ProductName”]= “Book”;dtProducts.
Rows[2][“ProductName”]= “Computer”;dtProducts.
Rows[3][“ProductName”]= “Spoon”;dtProducts.
AcceptChanges();
The user utilizes a Web Form to delete the first product. You need to set the RowStateFilter property of the DataTables DefaultView so that only products that have not been deleted are shown. To which value should you set the DataTabless DefaultView.RowStateFilter? （）

You are creating a DataTable. You use the following code segment to create the DataTable. (Line numbers are included for reference only.)
01 DataTable dt = new DataTable(“Products”);
02 dt.Columns.Add(new DataColumn(“Price”, typeof(decimal)));
03 dt.Columns.Add(new DataColumn(“Quantity”, typeof(Int32)));
04 DataColumn dc = new DataColumn(“Total”, typeof(decimal));
05 dt.Columns.Add(dc);
You need to ensure that the Total column is set to the value of the Price column multiplied by the Quantity column when new rows are added or changed. What should you do? （）