ObjectDataSource.Selected Event

ObjectDataSource.Selected Event
Occurs when a Select operation has completed.

Code
 1<form id="Form1" method="post" runat="server">
 2
 3    <asp:objectdatasource
 4      ID="ObjectDataSource1"
 5      runat="server"
 6      SelectMethod="GetFullNamesAndIDs"
 7      TypeName="Samples.AspNet.CS.EmployeeLogic" />
 8
 9    <p>
    <asp:dropdownlist
      ID="DropDownList1"
      runat="server" 
      DataSourceID="ObjectDataSource1"
      DataTextField="FullName"
      DataValueField="EmployeeID" 
      AutoPostBack="True" 
      AppendDataBoundItems="true">
        <asp:ListItem Text="Select One" Value=""></asp:ListItem>
    </asp:dropdownlist>
    </p>

    <asp:objectdatasource
      ID="ObjectDataSource2"
      runat="server"
      SelectMethod="GetEmployee"
      UpdateMethod="UpdateEmployeeAddress"
      OnUpdating="EmployeeUpdating"
      OnSelected="EmployeeSelected"
      TypeName="Samples.AspNet.CS.EmployeeLogic" >
      <SelectParameters>
        <asp:ControlParameter ControlID="DropDownList1" DefaultValue="-1" Name="empID" />
      </SelectParameters>
    </asp:objectdatasource>

    <asp:DetailsView
        ID="DetailsView1"
        runat="server"
        DataSourceID="ObjectDataSource2" 
        AutoGenerateRows="false"
        AutoGenerateEditButton="true">  
        <Fields>
            <asp:BoundField HeaderText="Address" DataField="Address" />
            <asp:BoundField HeaderText="City" DataField="City" />
            <asp:BoundField HeaderText="Postal Code" DataField="PostalCode" />
        </Fields>  
    </asp:DetailsView>

</form>

Code
 1public void EmployeeUpdating(object source, ObjectDataSourceMethodEventArgs e)
 2{
 3    DataContractSerializer dcs = new DataContractSerializer(typeof(Employee));
 4
 5    String xmlData = ViewState["OriginalEmployee"].ToString();
 6    XmlReader reader = XmlReader.Create(new StringReader(xmlData));
 7    Employee originalEmployee = (Employee)dcs.ReadObject(reader);
 8    reader.Close();
 9
    e.InputParameters.Add("originalEmployee", originalEmployee);
}

public void EmployeeSelected(object source, ObjectDataSourceStatusEventArgs e)
{
    if (e.ReturnValue != null)
    {
        DataContractSerializer dcs = new DataContractSerializer(typeof(Employee));
        StringBuilder sb = new StringBuilder();
        XmlWriter writer = XmlWriter.Create(sb);
        dcs.WriteObject(writer, e.ReturnValue);
        writer.Close();

        ViewState["OriginalEmployee"] = sb.ToString();
    }
}