code: def namespace_definition(self, namespace):
      self.add_namespace_def(namespace)
      yield
      self.add_block_termination()
  
file_path: m2cgen/m2cgen/interpreters/c_sharp/code_generator.py
imports: from contextlib import contextmanager
  from m2cgen.interpreters.code_generator import CLikeCodeGenerator
label_desc: Use image node_id 6 for calling the CSharpCodeGenerator obj's underlying member method code with example usage: obj.namespace_definition(namespace) without return types