compiler error in (some) tutorials

Hi Im just getting started learning some d3d, using c#. Ive downloaded the dx sdk for c# and had my fun writing some simple stuff. But when i try to do something a bit more advanced, i run into trouble. The problem i run into is just the same as the problem i get when i try to compile the tutorials that come with the sdk, or rather when i try to compile tutorial 4 and 5: C:\..\Tutorial4\Lights.cs(53): 'Microsoft.DirectX.Direct3D.Device' does not contain a definition for 'DeviceCreated' C:\..\Tutorial4\Lights.cs(92): 'Microsoft.DirectX.Direct3D.CustomVertex.PositionNormal' does not contain a definition for 'SetPosition' C:\..\Tutorial4\Lights.cs(93): 'Microsoft.DirectX.Direct3D.CustomVertex.PositionNormal' does not contain a definition for 'SetNormal' C:\..\Tutorial4\Lights.cs(94): 'Microsoft.DirectX.Direct3D.CustomVertex.PositionNormal' does not contain a definition for 'SetPosition' C:\..\Tutorial4\Lights.cs(95): 'Microsoft.DirectX.Direct3D.CustomVertex.PositionNormal' does not contain a definition for 'SetNormal' C:\..\Tutorial4\Lights.cs(138): 'Microsoft.DirectX.Direct3D.Light' does not contain a definition for 'Commit' for all i know that looks like the dll file that i refer is of a different version than the sample code. But i havent done anything fancy with installing old .net framework, old dx sdk or anything, and the dlls are only on my disk once (not refering the wrong path). I managed to "heal" some of the errors by changing "foo.SetNormal(...)" to "foo.Normal = ..." etc. but cant fix it all straight away, and it annoyes me to have to alter the sample source. Any ideas? thx Kasper