How can i save data in Ms Access for long time ?

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MS-Access

Hi all visitors
i have problem with saving data to Ms Access using Binding source in VB.NET
I used Binding Source to insert data from my form to Ms Access but it can't save for long time.

in Table item doesn't have any record and one the form i input 2 record
This is the code in my button SAVE

Me.ItemBS.endedit()
Me.ItemTA.update(me.PP.item)

After i clicked on button save, i go to open Ms Access File.
I can see the new data that i just input on form. but a few minutes later, when i open Ms Access again, all data in table ITEM will be nothing.
Anybody know how to solve this problem?

Thanks
TONY