Microsoft is releasing a patch for Windows to update the behaviour of automatic daylight savings adjustments. This is necessary because DST dates in the United States will start three weeks earlier (2:00 A.M. on the second Sunday in March) and will end one week later (2:00 A.M. on the first Sunday in November).

The .NET Framework uses the operating system to determine current date. So as long as you apply the Windows patch, your .NET application will automatically use the new DST rules.

Read more information in the Microsoft knowledge base: http://msdn2.microsoft.com/en-us/vstudio/bb264729.aspx