Parse , parsing the value as a currency. UpdateProduct, in our previous tutorial The underlying data, which now includes the updated changes, is rebound to the GridView During this sequence of steps, a number of events fire, enabling us to create event handlers to add custom logic where needed. We can, at this point, cancel the update request if there is some validation error. Augment the GridView's RowUpdating event handler as follows: Let's extend the RowUpdating event handler to set e.
Set the Label's Text property to "You must provide a price for the product. Let's explore this latter approach. This is because the productID input parameter is a primary key value and passed in through the value of the DataKeyNames property for the edited row. In this tutorial we examined the pre-level events and saw how to use these to customize the input parameters or cancel the data modification operation altogether both from the data Web control and ObjectDataSource's events. Similarly, if a required field, such as ProductName, is removed from the editing interface, the update will fail with a "Column 'ProductName' does not allow nulls" exception. If not, it returns false, indicating that the request to update the product information failed. These concepts carry over to the DetailsView and FormView controls and also apply to inserting and deleting. We can, at this point, cancel the update request if there is some validation error. To change the value of one of these parameters, simply use: Scott works as an independent consultant, trainer, and writer. We can overwrite the existing UnitPrice value in the NewValues collection with a decimal value parsed using the currency format with the following lines of code in the RowUpdating event handler: Inserting, updating, or deleting data from the GridView, DetailsView, or FormView precipitates the same sequence of pre- and post-level events for both the data Web control and the ObjectDataSource. The Interface Allows Editing Just the Product's Name and Price Click to view full-size image Note As discussed in the previous tutorial, it is vitally important that the GridView s view state be enabled the default behavior. The DetailsView maintains its inserting interface and the GridView is automatically rebound to its data source in order to include the new product, as shown in Figure Note In a real-world application you would likely want to either let the user specify the category and supplier or would pick this value for them based on some criteria or business logic rather than blindly selecting an ID of 1. Updating a Product'sProductNameandUnitPriceFields In the editing interfaces from the previous tutorial all product fields that were not read-only had to be included. Figure 11 shows both the problem caused by currency symbols in the user-supplied UnitPrice, along with how the GridView's RowUpdating event handler can be utilized to correctly parse such input. Therefore, if our GridView contains BoundFields and CheckBoxFields for all of the product's fields, the ObjectDataSource will end up invoking the UpdateProduct overload that takes in all of these parameters, despite the fact that the ObjectDataSource's declarative markup specifies only three input parameters see Figure 5. Parse , parsing the value as a currency. Concurrency Issue with ASP. At this point the DetailsView's declarative syntax should look like: By default, those values that aren't supplied in the DetailsView's inserting interface will be set to a NULL database value. If we want to provide a data Web control that allows the end user to only update a subset of fields, then we need to either programmatically set the missing UpdateParameters values in the ObjectDataSource's Updating event handler or create and call a BLL method that expects only a subset of the fields. He can be reached at mitchell 4GuysFromRolla. Lead reviewers for this tutorial were Jackie Goor and Liz Shulok. To keep a consistent user interface when adding a new product let's allow the user to only enter values for the ProductName and UnitPrice fields.
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