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06-Jan-2018 20:13

To have this Table Adapter employ optimistic concurrency control, simply check the "Use optimistic concurrency" checkbox. Get Product By Product ID(original_product ID) If products.Figure 6: Enable Optimistic Concurrency Control by Checking the "Use optimistic concurrency" Check Box (Click to view full-size image) Lastly, indicate that the Table Adapter should use the data access patterns that both fill a Data Table and return a Data Table; also indicate that the DB direct methods should be created. Count = 0 Then ' no matching record found, return false Return False End If Dim product As _ Northwind Optimistic Concurrency.In this tutorial we'll implement optimistic concurrency control to handle this risk.For web applications that only allow users to view data, or for those that include only a single user who can modify data, there's no threat of two concurrent users accidentally overwriting one another's changes.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.The Data Access Layer must issue a SQL statement that will only update the record if the original values that the user started editing are identical to the values still in the database. Figure 2: For the Update or Delete to Succeed, the Original Values Must Be Equal to the Current Database Values (Click to view full-size image) There are various approaches to implementing optimistic concurrency (see Peter A.

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For a web application that allows multiple users to edit data, there is the risk that two users may be editing the same data at the same time.

There are three concurrency control strategies available: All of our tutorials thus far have used the default concurrency resolution strategy - namely, we've let the last write win.



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