Bulk insert in oracle table

I have an excel file which might have 90k records.
Each record should store in Oracle Table.
While using this code- dataadapter.update(Excel) where Excel is the datatable contains excel sheet value
But it takes so much time that application hangs
is it possible to minimize the time?
Any one know Bulk insert into oracle table from excel file using application.
I am using system.data.oracle

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