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07-Jun-2015 20:27

For example, prior to step 1, the Row Updating event of the Grid View fires.

We can, at this point, cancel the update request if there is some validation error.

The Object Data Source would then pass in a NULL value into the Update Product method of the Business-Logic Layer (BLL), which would change the edited database record's Quantity Per Unit column to a NULL value.

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After the method of the underlying object of the Object Data Source has completed executing, the Updated event of the Object Data Source is raised.Go to the Source view to inspect the declarative markup of the Object Data Source, which is shown here: Because there are no mappings for the Insert() and Delete() methods of the Object Data Source, there are no Insert Parameters or Delete Parameters sections.Furthermore, because the Update() method is mapped to the Update Product method overload that only accepts three input parameters, the Update Parameters section has just three Parameter instances.(29 printed pages) Download the code for this sample.Introduction Step 1: Updating a Product's Product Name and Unit Price Fields Improving the Unit Price Formatting Step 2: Prohibiting NULL Unit Prices Step 3: Providing an Interface to Add New Products Step 4: Assigning Values to the Category ID and Supplier ID Parameters Conclusion When using the built-in inserting, editing, or deleting features of the Grid View, Details View, or Form View controls, a variety of steps transpire when the end user completes the process of adding a new record or updating or deleting an existing record.

After the method of the underlying object of the Object Data Source has completed executing, the Updated event of the Object Data Source is raised.Go to the Source view to inspect the declarative markup of the Object Data Source, which is shown here: Because there are no mappings for the Insert() and Delete() methods of the Object Data Source, there are no Insert Parameters or Delete Parameters sections.Furthermore, because the Update() method is mapped to the Update Product method overload that only accepts three input parameters, the Update Parameters section has just three Parameter instances.(29 printed pages) Download the code for this sample.Introduction Step 1: Updating a Product's Product Name and Unit Price Fields Improving the Unit Price Formatting Step 2: Prohibiting NULL Unit Prices Step 3: Providing an Interface to Add New Products Step 4: Assigning Values to the Category ID and Supplier ID Parameters Conclusion When using the built-in inserting, editing, or deleting features of the Grid View, Details View, or Form View controls, a variety of steps transpire when the end user completes the process of adding a new record or updating or deleting an existing record.Because this editing interface only provides a subset of a product's fields, we must create either an Object Data Source that uses the Update Product method of the existing BLL and has the missing product field values set programmatically in its Updating event handler or a new BLL method that expects only the subset of fields defined in the Grid View.