Gridview handle rowupdating
Gridview handle rowupdating - rich people dating site
However, the Grid View on Sam's screen still shows the product name in the editable Grid View row as "Chai".A few seconds after Jisun's changes have been committed, Sam updates the category to Condiments and clicks Update.
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.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.Pessimistic concurrency is rarely used because such locks, if not properly relinquished, can prevent other users from updating data.For example, if a user locks a record for editing and then leaves for the day before unlocking it, no other user will be able to update that record until the original user returns and completes his update.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.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.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.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.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.