Friday, July 10, 2009

IIS hyperlinks fail - cannot open an anonymous level security token

Recently upgraded a test machine to Internet Explorer 8. While testing a new deployment today found that hyperlinks created in my web application stopped working. The error icon on the bottom left of the screen said: "Cannot open an anonymous level security token"

The solution from a microsoft community site was to reset DCOM default properties to "Connect/Identify".

After rebooting and reopening the site in IE8 the links now work.

We tinker with DCOM on this test machine quite often and I found it with default properties of "None/Impersonate" - maybe impersonate causes a problem for anon access but I don't remember these problems with IE7. Hopefully this is not a sign the IE8 is going to "UAC" all over the system like Vista did.

Getting version number from a visual basic 2008 web application

Dim versionInfo As String = System.Reflection.Assembly.GetExecutingAssembly().GetName() .Version.ToString()

Obvious in hindsight, but took me a little while to find it

Tuesday, July 7, 2009

Changing the background color of a checkbox at runtime

I wanted to show 3 values in a checkbox ("full", "partial", and "empty") by changing background color of the selected checkbox when state is "partial"

I thought we could simply set the background color property, but that had no effect for me at runtime. It took a while to find how to programatically change background color of a checkbox on a VB web form, finally this post and this post got me close enough.

How to change the color at runtime:

(1) Add CSS style declarations to your form's design view (.aspx page), for example:

.full {
background-color: #fff;
.partial {
background-color: #ccc;

(2) in the form load method add some code like this:

curControl = CType(Page.FindControl(sID), CheckBox)

if (ispartial) then
curControl.Checked = True
curControl.CssClass = "partial"
else if (isfull) then
curControl.Checked = True
curControl.CssClass = "full"