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She clicks the Edit button and starts to make her change.

At the same time, the other manager visits the page and sees the unit price below .00 and, noting store policy, decides to mark it as discontinued.

Microsoft offers a form of optimistic concurrency control from the Sql Data Source control that can be enabled by ticking a checkbox.

This article looks at different types of concurrency control and then shows how to implement the built-in optimistic concurrency control offered by the Sql Data Source control. Before we explore concurrency control options and see how to utilize the Sql Data Source control's built-in optimistic concurrency control functionality, let's first take a moment to discuss why concurrency control may be needed.

We can augment the Grid View so that instead of a Select button, each row contains a radio button or checkbox.

In scenarios where the user can only select one of the Grid View records, the radio button might be preferred over the Select button.

Pessimistic concurrency, on the other hand, implements policies to ensure that concurrency violations cannot occur.

These policies may add friction to the end user's data entry experience.

Optimistic assumes that concurrency violations are rare and that if such an error occurs that it's adequate to ask one of the conflicting parties to re-enter their information.

When clicked, a postback ensues and the Grid View s property is updated to the index of the row whose Select button was clicked.

In the Master/Detail Using a Selectable Master Grid View with a Details Detail View tutorial, we saw how to use this feature to display details for the selected Grid View row.

These controls allow page developers to declaratively access and modify data without writing any code to perform the data access. ) Because multiple users can visit the same web page concurrently, it is possible for a user visiting a data modification page to inadvertently overwrite the modifications made by another user. If two users visit this page simultaneously from different computers and both edit the same row, whomever saves the first will have her changes overwritten by whomever saves the row last.

This article is one in a series of articles on ASP. This type of behavior is known as "last write wins" and is the default behavior for web applications.

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