Is there an equivalent method in the .NET framework that provides the same
functionality as the LookupAccountName() win32 function? Actually, all I
really need is to find the domain of an Active Directory user account. I
don't need the SIDs.

Hope, somebody is able to give me some advice:
I tried to install Duwamish 7.0 for some testing. The installation failed
with a message, that I have to install .Net Framework SDV v1.0 3705 although
I have v1.1 already installed and available on the machine.

If we installed 2 version of .NET Framework (1.1 and 2.0) in the same
machine, how can I config my application or website to use the specified
version of framework?
And how can I know the default version of framework that is using as a