IT will serve no purpose. If you do dharna at his place, he will cal the police for creating nuisance and fast until death, in this case also police will take you hospital and feed you.

But no criminality while doing both.

Dear Sir,

If you want to protest against Private person as Dharna is o.k but sit for fat unto death is a punishable offence under law.

If a person openly declares that he will sit on a fast unto death and then proceeds to refuse all nourishment until the stage is reached when there is imminent danger of death ensuing he can be held guilty under the Section  309 of the Indian Penal Code, but when the evidence falls short of this, it cannot be said to be sufficient to sustain the charge, says the book ‘Be your own lawyer’ by Advocate Tehemton Dalal.

Under the constitution you have right to do so but before that think twice what steps you have taken till date for your grievance and who is responsible for that then start at a safer place like Jantar Mantar at Delhi which has been declared a place for the protest by the courts on different occasions.

Yes,since committing suicide is considered to be a crime the police can arrest you and force fed you to keep you alive.

But if you make the fasting only surviving on liquids then it would serve your purpose and would not attract penal action a well. 

By the way if you do this against an individual then you would be wasting your time and others time as well.

Go and search for other alternative. 

Police will not arrest you but if your medical condition worsens they may admit you to the hospital forcefully

Please take Legal Actions. Whatever the relief you may want from that individual, Please file a case before competent Court of Law.

You are at liberty to protest by sitting silently 

2) however fast unto death is an offence 

No doubt you have liberty to protest on anything which has aggrieved you and sitting at silence in the form of Dharna may not be considered as a crime, however sitting at dharna either against a private person or a body, you may have to obtain permission from  police for this as the opposite party may make a complaint agaisnt you for creating nuisance in front of his house.

You will be arrested for creating nuisance in public place because you will be sitting in the road against the private person's home or office moreover you have declared to fast until death, which is a serious issue and punishable under section 309 of IPC.

But what purpose will it serve?

Dear sir 

Don't use microphone and loudspeaker and don't obstruct any public way. Or create any nuisance so that you do no offence against public interest. 

And also don't use any material that can be used against you for case if defamation.

Protesting silently without any disturbances to others with playcard is your liberty and you have rights. 

Fast unto death punishable by law. 

Under Section 309 of the Indian Penal Code, whoever attempts to commit suicide and abets the commission of it is liable to be punished with simple imprisonment for a term, which may extend to one year, or with fine, or with both..