User Account/Password Validation

I'm looking for a managed code way to validate a user account (possibly in a domain) and password, in particular one that uses SSPI. LogonUser isn't reliable because (as the docs say) the calling user sometimes needs the SE_TCB_NAME privilege. There's a link to some C++ SSPI code in the LogonUser docs that I'd rather not use if I can avoid it.  http://support.microsoft.com/kb/180548 

This isn't an ASP.NET environment, just an existing app needing to validate credentials typed into a windows form. I keep thinking I'm missing something obvious....

Thanks 

Phil Wilson 

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