Discharge of 498a under crpc 239..?

Hello All,

My 498a proceedings are going in lower(Metropolitan Megistrate) court.  in this month ending, examination of accused is there(starting stage of trial). 

Can I file Discharge petition under section 239 crpc at the stage of examination?

Can I file Even during the stage of trial also?

If the discharge petition allowed, then the proceedings of 498a will stopped until this discharge petition disposed off?

Please provide your inputs

Thanks in advance.