Watin and ApartmentState.STA - unit-testing

Question

Issue: "The CurrentThread needs to have it's ApartmentState set to ApartmentState.STA to be able to automate Internet Explorer."
First of all i have read all the solutions to the problems above and none works for me.May be i am missing something. I have tried adding Execution Thread entry into my app.config, also tried setting STAThread attribute and i am still facing the same exception as stated above.
Tools: Visual Studio 2010, Watin 2.1, c#
Scenario: Trying to run a unit test [watin script in c#] from a web application upon a button click. But the above exception is thrown when the script is about to launch IE on the following line :
IE mybrowser = new IE ("SomeURL here");
Any Thoughts ?

Answer 1

Got it from a friend. We actually dont have to add any app.config entry. Just start the thread in a single state. In my case, i wrote the following code in my button click handler:
System.Threading.Thread th = new Thread(new ThreadStart(Test));
th.SetApartmentState(ApartmentState.STA);
th.Start();
th.Join();
and i moved the call to unit test in the private. TEST method as follows:
private void Test()
{
var som = new Project.ClassName();
som.MethodToExecute();
}

Answer 2

What does your App.Config look like?
<NUnit>
<TestRunner>
<!-- Valid values are STA,MTA. Others ignored. -->
<add key="ApartmentState" value="STA"/>
</TestRunner>
</NUnit>
The above works for me on Win7, IE9 (32bit), and Watin2.1. It also works on WinXP, IE8, WatiN 2.1. I'm 99% sure it worked just fine on previous versions of WatiN as well. No other ApartmentState changes were needed.

Answer 3

Simply add [assembly: RequiresSTA] at the top of your file or at the entry point of your project.

Answer 4

I had already done the app.config changes
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<sectionGroup name="NUnit">
<section name="TestRunner" type="System.Configuration.NameValueSectionHandler" />
</sectionGroup>
</configSections>
<NUnit>
<TestRunner>
<add key="ApartmentState" value="STA" />
</TestRunner>
</NUnit>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="nunit.framework" publicKeyToken="96d09a1eb7f44a77" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-2.6.3.13283" newVersion="2.6.3.13283" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
but no dice. I opened AssemblyInfo and added
[assembly: RequiresSTA]
and suddenly, the universe began to function properly again.