Dear Seema, Karnataka is an Open State. So you necessarily needn't have a domicile of Karnataka to participate in their State Counselling. Having said that, the domicile eligibility criteria for Karnataka MBBS admission are as follows:

1. The Candidate should have studied in Karnataka for a minimum period of 7 years in any Government Recognised Institute of Karnataka
2. The Candidate should have passed 11th and 12th from Government Recognised Institute of Karnataka or either of the parents should have studied in Karnataka for a minimum period of 7 years
3. A Candidate who has studied in a State outside Karnataka can be eligible if either of the parent's hold domicile of Karnataka. In this case, the mother tongue of the said parent should be either Tulu/Kannada/Kodava. If this is the case, the Candidate should give a Kannada Language test.