error while running a c#script inside soundforge

i am trying to run a c# script inside the soundforge script editor but it is not supporting system.Linq.... here is the error enclosed.. any help in this regard is appreciated..thank you

Compiler error 0x80004005 on Line 23,14 : The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)