Getting data in Datagridvw in buttnclick but unable 2 update

Question

Getting data in Datagridview in a button click but unable 2 update
the changes that are done in the data in the gridview cells in the runtime and update the same & see the changes in the database as well as datagridview in runtime when i click the reload button

how to do that in C# language

am using microsoft data provider for .NET in oracle database