The UML model is easy to describe the object oriented program components clearly in graphical notation. OCL allows users to express textual constraints about the UML model. The USE tool allows specification to be expressed in a textual format for all features of the UML model with OCL constraints. Spec# is a formal language, which extends C# with constructs for non-null types, preconditions, post conditions, and object invariants. It allows programmers to document their design decisions in the code. Spec# has run time verifier to verify the specification constraints over the C# code. This paper describes the mapping of USE specifications into Spec# which helps to improve the quality of both UML/OCL and Spec#.