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Delete with ObjectDataSourc e does not work


I just tried out the ObjectDataSourc e of ASP.NET 2.0. A simple application
works with a GridView bound to an ObjectDataSourc e. The ObjectDataSourc e is
set to a (factory) class (PersonFactory) with static methods (Select,
Update, Delete, see below). The factory methods work with instances of a
simple class (Person, see below). Select and Update works, but the Person
object passed to the Delete method is always empty (Id == 0; FirstName ==
null, LastName == 0). I tried to use factory methods with separate
parameters, but the (Person)Id parameter passed to the Delete method is also

Anyone who knows what's wrong?


The Person class
public class Person
private int id;
public int Id
get { return this.id; }
set { this.id = value; }

private string firstName;
public string FirstName
get { return this.firstName; }
set { this.firstName = value; }

private string lastName;
public string LastName
get { return this.lastName; }
set { this.lastName = value; }

The PersonFactory class (simplified)
*************** ************
public class PersonFactory
public static List<Person> Select()
List<Person> persons = new List<Person>();

// "Read" persons
Person p = new Person();
p.Id = 1001;
p.FirstName = "Zaphod";
p.LastName = "Beeblebrox ";

p = new Person();
p.Id = 1002;
p.FirstName = "Ford";
p.LastName = "Prefect";

return persons;

public static void Update(Person p)
// Update person
// ...

public static void Delete(Person p)
// Delete Person
// But: p is an empty object (p.Id == 0) !???

The ObjectDataSourc e and the GridView on the Web form
*************** *************** ***************
<asp:ObjectData Source ID="personDataS ource" runat="server"
SelectMethod="S elect"
TypeName="Perso nFactory" DeleteMethod="D elete" InsertMethod="I nsert"
UpdateMethod="U pdate"
DataObjectTypeN ame="Person">
</asp:ObjectDataS ource>

<asp:GridView ID="personGridV iew" runat="server" AutoGenerateCol umns="False"
DataSourceID="p ersonDataSource "
BackColor="Whit e" BorderColor="#C CCCCC" BorderStyle="No ne"
BorderWidth="1p x" CellPadding="4"
ForeColor="Blac k" GridLines="Hori zontal">
<asp:CommandFie ld ShowDeleteButto n="True" ShowEditButton= "True" />
<asp:BoundFie ld DataField="Id" HeaderText="Id" SortExpression= "Id" />
<asp:BoundFie ld DataField="Firs tName" HeaderText="Fir stName"
SortExpression= "FirstName" />
<asp:BoundFie ld DataField="Last Name" HeaderText="Las tName"
SortExpression= "LastName" />
<FooterStyle BackColor="#CCC C99" ForeColor="Blac k" />
<SelectedRowSty le BackColor="#CC3 333" Font-Bold="True" ForeColor="Whit e"
<PagerStyle BackColor="Whit e" ForeColor="Blac k" HorizontalAlign ="Right"
<HeaderStyle BackColor="#333 333" Font-Bold="True" ForeColor="Whit e" />

May 16 '06 #1
1 1928
I found the answer myself: I have to set the DataKeyNames propery to the
name of the Id property.
May 16 '06 #2

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