Stopped working

Problem Event Name: CLR20r3

Problem Signature 01: telerik.teststudio.resultsviewer

Problem Signature 02: 2011.2.1117.0

Problem Signature 03: 4ec4da3b

Problem Signature 04: ArtOfTest.WebAii.Design

Problem Signature 05: 2011.2.1117.0

Problem Signature 06: 4ec4dafe

Problem Signature 07: ff5

Problem Signature 08: 1f

Problem Signature 09: System.NullReferenceException

OS Version: 6.1.7601.2.1.0.272.7

Locale ID: 3079

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WaitForLogoutButtonAvailable.tstest.vb: Line 81: (BC30491) Expression does not produce a value.
This is the VB sub:

        Public Sub WaitForLogoutButtonAvailable_CodedStep()
            Dim found As Integer = 0
            Dim s As HtmlSpan = Find.ByExpression(Of HtmlSpan)("textcontent=~logout")
            While found = 0
                If (Assert.IsNotNull(s)) Then
                    'Stop looking
                    found = 1
                Else
                    'Wait for '250' msec.
                    System.Threading.Thread.Sleep(250)
                End If
            End While
        End Sub

I tried exchanging the statement:
     If (Assert.IsNotNull(s)) Then
for:
     If (Assert.IsNotNull(s) = true) Then
but I get the same result.  I also tried with various speechamrks, 1's and 0's.  I read the on-line documentation (http://www.telerik.com/automated-testing-tools/support/documentation/user-guide/write-tests-in-code/intermediate-topics/html-control-suite/html-asserts.aspx, and also http://www.telerik.com/automated-testing-tools/support/documentation/user-guide/write-tests-in-code/intermediate-topics/element-identification/findparam-objects.aspx) but the pages don't actually show me what is returned by the assert.

Where am I going wrong?

Thanks,
Nigel Edwards, Transition Computing

Hi,
I need help to find and identify screen objects whose name changes.
Specific Scenario Example
I have a screen with a Logout button.  The visible text on the button is 'Logout ' plus the name of the logged on user (e.g. 'Logout Admin').  When I record the action of clicking on the button in Test Studio the script supplies a line that reads:
    Click 'LogoutSpan'
or
    Click 'LogoutSpan0'
or similar.
Question
How can I script so that the action works regardless of any number that may be appended to the 'LogoutSpan' part?
In fact, how can I identify anything (e.g. a 'Div') where its name or ID changes dynamically?

I thought that maybe some VB in the Code Behind window would be a solution, perhaps using a regular expression.  In the case of the button I came up with:

    Find.ByExpression("name=~Logout")
which I think will find any screen object with 'Logout' in its name, but got no further.  I tried to write an excution line, something like:
    Button.Click(Find.ByExpression("name=~Logout"))
but the type-ahead prompt in the Code Behind window didn't have 'Button.Click' as an option.

I'm not a code wizard, and don't really understand regular expressions (and yes, I've read the available on-line documentation) so I would very much appreciate some help with this.  If I have a concrete example of how to resolve the above then I can build on it for the future.

Thanks,
Nigel Edwards, Transition Computing.