I would like to write (or use if it already exits) a function in C# that returns the date/time of the next DST transition given a System.TimeZoneInfo object and a particular "as of" time in that time zone. The time returned should be in the provided time zone. The function I want has this signature:

public DateTime GetNextTransition(DateTime asOfTime, TimeZoneInfo timeZone)
{
    // Implement me!
}

For example, if I pass in the "Eastern Standard Time" TimeZoneInfo object, and 1/21/2011@17:00 as the "asOfTime", I expect this function to return 3/13/2011@2:00.

The System.TimeZoneInfo.TransitionTime structure appears to have all the information I need, but ideally there would be some sort of built-in mechanism to convert the rule into an actual date. Anyone have any suggestions?

c# datetime dst
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