MS .net based support ticketing

The small software company I work for is looking for a support ticketing system. Does anyone know of a support ticketing system based on the .net framework, preferrably C# (though asp.net would work too) that uses the MS SQL database product? I'd be the first to advocate for one of the many php based solutions out there, but we're a MS based shop and the programmers want a .net solution. Thanks for any help you guys can throw me