Fill DataGridView into Oracle database C#

My goal for this is to Update a Database table in Oracle with a DataGridView.
I have a datagridview1 containing the same column as the Oracle database.

I stuck @ how to fill the datatable with the DataGridView and Deleting everything from the current Oracle Database and insert the New DataTable.
OracleCommand oraclecmd = new OracleCommand("SELECT * FROM LOCATION", localConnection);
                        oracleda.SelectCommand = oraclecmd;
                        DataTable oracledt = new DataTable();
                       //Fill DataTable with datagridview1
                       //Delete everything from existing data then insert

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