A case of rape was registered against the son of Railway Minister DV Sadananda Gowda on a complaint by a woman who claimed that she is married to him, even as his engagement ceremony took place on Wednesday.br br Gowda expressed shock at the allegation and suspected a conspiracy and attempt to blackmail, while his son Karthik rejected the woman's claim.br br "She has filed a complaint in RT Nagar police station against Karthik Gowda, Sadananda Gowda's son, for allegedly raping and cheating her," Bangalore Police Commissioner M N Reddi said in Bangalore.\br br The case has been booked against Karthik under sections 376 (punishment for rape) and 420 (cheating) of the Indian Penal Code, Reddi said.