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The runtime interface of this program is shown in the diagram below, it allows adding and deletion as well as updating and browsing of data. To connect ADO to this database file , follow the steps below: a) Click on the ADO control on the form and open up the properties window.

To be able to access and manage a database, you need to connect the ADO data control to a database file. b) Click on the Connection String property, the following dialog box will appear.

After this, you can proceed to build your ADO-based VB database applications.

Next, insert the necessary labels, text boxes and command buttons.

Optimistic concurrency control works by ensuring that the record being updated or deleted has the same values as it did when the updating or deleting process started.

For example, when clicking the Edit button in an editable Grid View, the record's values are read from the database and displayed in Text Boxes and other Web controls. Later, after the user makes her changes and clicks the Update button, the original values plus the new values are sent to the Business Logic Layer, and then down to the Data Access Layer.

To overcome these limitations, we can use a much more powerful data control in VB known as ADO control. As ADO is Active X-based, it could work in different platforms (different computer systems) and different programming languages.

Besides, it could access many different kinds of data such as data displayed in the Internet browsers, email text and even graphics other than the usual relational and non relational database information.

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Both click the Edit button in the Grid View around the same time.

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