[Updated 22:00 12 June 2008] To include improvements suggested by Andrew Arnott.
In this post I'll describe the steps I took to add OpenID support to an existing ASP.NET app that used forms authentication. The application originally used the users email address as their username. The OpenID login process therefore needs to provide an email address to avoid having to rewrite loads of code. Not all OpenID providers allow email addresses to be sent so new users might have to partially re-register the first time they use their OpenID.
protected void OpenIdLogin1_LoggedIn (object sender, OpenIdEventArgs e)
{
State.ProfileFields = e.ProfileFields;
// Setup linq connection to SQL database
DataClassesDataContext db = new DataClassesDataContext(ConfigurationManager.ConnectionStrings["DB_RW"].ConnectionString);
People people = null;
// See if user has logged on using OpenID before
try
{
people = (from c in db.Peoples
where c.OpenID == e.ClaimedIdentifier.ToString()
select c).Single();
}
catch
{
}
if (people == null)
{
// This is the first time this OpenID identity has been used
if (e.ProfileFields.Email == null)
{
// Force user to register as their OpenID provider did not send their email
// address (eg Yahoo.com) and this app needs their real email address.
e.Cancel = true;
Response.Redirect("RegisterNewAccount.aspx?mode=OpenID_NoEmailSupplied");
return;
}
else
{
// See if user has created an account already
try
{
people = (from c in db.Peoples
where c.Email == e.ProfileFields.Email
select c).Single();
}
catch
{
// email address does not exist in our user table redirect user
// to registration page.
e.Cancel = true;
Response.Redirect("RegisterNewAccount.aspx?mode=OpenID_UnknownEmail");
return;
}
}
}
if (people.Status.StartsWith("Reject T&C"))
{
e.Cancel = true;
loginFailedLabel.Text = "Your account has been suspended because you have rejected our T&C's.";
loginFailedLabel.Visible = true;
return;
}
if (people.Status != "Verified")
{
e.Cancel = true;
loginFailedLabel.Text = "Your account has not been verified yet. Check your email for further instructions.";
loginFailedLabel.Visible = true;
return;
}
// Remember OpenID identity for next time
people.OpenID = e.ClaimedIdentifier.ToString();
people.LoginCount = (people.LoginCount ?? 0) + 1;
db.SubmitChanges();
// I set some other Session variables here
Session["UserEmail"] = people.Email;
// The openID code will now redirect to the requesting page
// and set context.user.identity.name to the OpenID identity
// eg http://andrew.jones.myopemid.com
}
// Create a generics list to hold selected rows so it can be sorted later
List<DataGridViewRow> SelectedRows = new List<DataGridViewRow>();
foreach (DataGridViewRow dgvr in yourDataGridViewControl.SelectedRows)
SelectedRows.Add(dgvr);
// Sort list based on DataGridViewRow.Index
SelectedRows.Sort (DataGridViewRowIndexCompare);
private static int DataGridViewRowIndexCompare (DataGridViewRow x, DataGridViewRow y)
{
if (x == null)
{
if (y == null)
{
// If x is null and y is null, they're
// equal.
return 0;
}
else
{
// If x is null and y is not null, y
// is greater.
return -1;
}
}
else
{
// If x is not null...
//
if (y == null)
// ...and y is null, x is greater.
{
return 1;
}
else
{
// ...and y is not null, compare the
// lengths of the two strings.
//
int retval = x.Index.CompareTo (y.Index);
if (retval != 0)
{
// If the strings are not of equal length,
// the longer string is greater.
//
return retval;
}
else
{
// If the strings are of equal length,
// sort them with ordinary string comparison.
//
return x.Index.CompareTo(y.Index);
}
}
}
}
<TextBox Height="138" Name="textBox_DeliverFrom" Width="257" AcceptsReturn="True" PreviewKeyDown="textBox_DeliverFrom_PreviewKeyDown" />
private void textBox_DeliverFrom_PreviewKeyDown (object sender, KeyEventArgs e)
{
// Do not allow more than 8 Lines
if (e.Key == Key.Enter)
{
if (textBox_DeliverFrom.LineCount > 7)
e.Handled = true;
}
}
Ever since I installed Vista on my Sony VGN-AR21S it has randomly crashed about every third re-boot. Task Manager would show the 'system' process using 98-100% processor utilisation. After about 10 minutes all 2Gb of memory would get used up and Vista would crash with a BSOD, typically a kernel in page error. I partially solved this problem by hibernating rather than shutting down the machine. I think I have now solved the problem.
I downloaded the excellent Sysinternals Process Monitor (http://www.microsoft.com/technet/sysinternals/default.mspx) which provides a full display of the individual executables running as part of the system process. Process Monitor showed that ndis.sys!NdisInitializeWrapper was consuming all the processor time and memory. This information indicated a network driver problem.
The machine has an Intel Pro 100/VE Ethernet card and an Intel Wireless 3945ABG Wi-Fi card. I downloaded the latest network drivers from the Intel web site and installed them. I then used device manager to delete both network devices. Device manager then re-detected both network cards. Having done this the machine appears to start-up without any problems.
It's really annoying that neither the Microsoft nor Sony update sites offer these new network drivers.
