Retrieving dropdownlist gridview rowupdating event
In this tutorial we'll examine how to implement optimistic concurrency control.Note We won't look at pessimistic concurrency examples in this tutorial series.In the first screen, we're prompted to specify the database to connect to - connect to the same Northwind database using the .Figure 3: Connect to the Same Northwind Database (Click to view full-size image) Next, we are prompted as to how to query the data: through an ad-hoc SQL statement, a new stored procedure, or an existing stored procedure.When using optimistic concurrency, the DB direct method overloads that accept Data Rows and Data Tables rather than scalar values) must be changed as well.Rather than extend our existing DAL's Table Adapters to use optimistic concurrency (which would necessitate changing the BLL to accommodate), let's instead create a new Typed Data Set named Business Logic Layer class that has the appropriate modifications to support the optimistic concurrency DAL.Without any concurrency policy in place, when two users are simultaneously editing a single record, the user who commits her changes last will override the changes made by the first.
Bromberg's Optmistic Concurrency Updating Logic for a brief look at a number of options). NET Typed Data Set provides one implementation that can be configured with just the tick of a checkbox.Or, between when a user loads a page and when they click the Delete button, another user may have modified the contents of that record.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.Both click the Edit button in the Grid View around the same time.Jisun changes the product name to "Chai Tea" and clicks the Update button. At this point in time, the database has the values "Chai Tea," the category Beverages, the supplier Exotic Liquids, and so on for this particular product.