Update Como box items in vb.net

Question

Hi folks I am developing application in vb.net using SQL-Server database... I use combobox to dropdown list of a unique field to display the data on the form depends on the combo selection.

When i save,Update it all works fine but when i delete the data it still stays in the combo list untill i re-open the form...... however the record deleted from actual database.

I am using DataAdapter, DataSet ......ADO.Net

Any Help ???????