Asp - ObjectDataSource UpdateMethod Passing Updated Values

I've got a gridview connected to an objectdatasource which is bound to some custom objects in my code (code is below). The problem I'm having is that the value passed into my update method is the old value, not the new value. Thoughts?

Imports System.Configuration
Imports System.Web.Configuration
Imports System.Security.Cryptography
Imports System.Collections.Generic

Partial Public Class ManageUsersControl
Inherits System.Web.UI.UserControl
Dim auth As AuthenticationSection
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Users.DataBind()
End Sub
End Class

Public Class Users
Private sName As String
Private sPassword As String
Public Sub New()
End Sub
Public Sub New(ByVal nm As String, ByVal pass As String)
Name = nm
Password = pass
End Sub
Public Property Name() As String
Get
Return sName
End Get
Set(ByVal value As String)
sName = value
End Set
End Property
Public Property Password() As String
Get
Return sPassword
End Get
Set(ByVal value As String)
sPassword = value
End Set
End Property
End Class

Public Class UserData
Dim auth As AuthenticationSection
Shared userTable As List(Of Users)
Public Sub New()
auth = CType(WebConfigurationManager.GetSection("system.web/authentication"), AuthenticationSection)
End Sub
Public Function CreateData() As List(Of Users)
Dim dt As New List(Of Users)
For Each user As FormsAuthenticationUser In auth.Forms.Credentials.Users
dt.Add(New Users(user.Name, user.Password))
Next
userTable = dt
Return userTable
End Function
Public Function SelectMethod() As List(Of Users)
If userTable Is Nothing Then
Return CreateData()
Else
Return userTable
End If
End Function
Public Function UpdateMethod(ByVal userInfo As Users) As Integer
Dim user As FormsAuthenticationUser = auth.Forms.Credentials.Users(userInfo.Name)
Dim pass As String
Dim sha As New SHA1CryptoServiceProvider()
Dim enc As New System.Text.ASCIIEncoding()
pass = enc.GetString(sha.ComputeHash(enc.GetBytes(userInfo.Password)))
userTable.Add(New Users(userInfo.Name, pass))
user.Password = pass
Return 1
End Function
End Class

and the markup:

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="ManageUsers.ascx.vb" Inherits="mystuff.ManageUsersControl" %>
<asp:GridView ID="Users" runat="server" AutoGenerateColumns="False"
AutoGenerateEditButton="True" AutoGenerateDeleteButton="True"
DataSourceID="UsersData">
<Columns>
<asp:BoundField DataField="Name" HeaderText="User Name" />
<asp:TemplateField HeaderText="Password" >
<InsertItemTemplate>
<asp:TextBox runat="server" ID="InsertPassword" Text='<%# Bind("Password") %>' />
</InsertItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="EditPassword" Text='<%# Bind("Password") %>' />
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server">*****</asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:ObjectDataSource ID="UsersData"
DataObjectTypeName="mystuff.Users"
UpdateMethod="UpdateMethod"
SelectMethod="SelectMethod"
TypeName="mystuff.UserData"
runat="server"
OldValuesParameterFormatString="original_{0}"></asp:ObjectDataSource>