Nullable decimal

Hello,

I have to set a value to the property of a dotnet variable. The property's data type is Nullable<decimal> which is represented as (dotnet) System.Nullable`1.'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

I define a variable with that data type but cannot instantiate or set a primitive value (say 2.0, 3.0 ect.) to it.
Please help!