Hi,
It seems System.dll does not contain the namespace, have you replace the dll?
Please check it's content using ildasm or .net reflector:
http://www.red-gate.com/products/reflector/It's located at :%SystemRoot%\Microsoft.net\Framework\v2.0.50727\System.dll
Are you working with a WindowsCE project? The System.dll does not contain the namespace:
C:\Program Files\Microsoft.NET\SDK\CompactFramework\v2.0\WindowsCE\System.dll
Harry
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