Net SqlDataSource control. The SqlDataSource control is set with the following properties. Config file. SelectCommand — The Select statement to fetch the records from the Customers table of the Northwind database. Related Articles. Add Comments.
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Privacy policy. Thank you. Microsoft makes no warranties, express or implied, with respect to the information provided here. Gets or sets the template for the heading section of the DataList control. A ITemplate that contains the template for the heading section of the DataList control.
The default value is null. The following code example demonstrates how to use the HeaderTemplate property to control the contents of the heading section of the DataList control. The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This approach requires a bit of code but, as we'll see in this tutorial, the DataList has some events and properties in place to aid in this process.
In this tutorial we'll see how to create a DataList that supports editing and deleting of its underlying data. Future tutorials will examine more advanced editing and deleting scenarios, including input field validation, gracefully handling exceptions raised from the Data Access or Business Logic Layers, and so on. Like the DataList, the Repeater control lacks the out of the box functionality for inserting, updating, or deleting.
While such functionality can be added, the DataList includes properties and events not found in the Repeater that simplify adding such capabilities. Therefore, this tutorial and future ones that look at editing and deleting will focus strictly on the DataList.
Before we start exploring how to update and delete data from a DataList, let s first take a moment to create the ASP. NET pages in our website project that we'll need for this tutorial and the next several ones. Start by adding a new folder named EditDeleteDataList. Next, add the following ASP. NET pages to that folder, making sure to associate each page with the Site.
Like in the other folders, Default. Recall that the SectionLevelTutorialListing. Therefore, add this User Control to Default. Lastly, add the pages as entries to the Web. After updating Web. The menu on the left now includes items for the DataList editing and deleting tutorials. Editing and deleting data with the GridView is so easy because, underneath the covers, the GridView and ObjectDataSource work in concert.
As discussed in the Examining the Events Associated with Inserting, Updating, and Deleting tutorial, when a row s Update button is clicked, the GridView automatically assigns its fields that used two-way databinding to the UpdateParameters collection of its ObjectDataSource and then invokes that ObjectDataSource s Update method.
Sadly, the DataList does not provide any of this built-in functionality. It is our responsibility to ensure that the user s values are assigned to the ObjectDataSource s parameters and that its Update method is called. To aid us in this endeavor, the DataList provides the following properties and events:. Using these properties and events, there are four approaches we can use to update and delete data from the DataList:.
If forced to only ever use one of these approaches, I d choose option 1 because it provides the most flexibility and because the DataList was originally designed to accommodate this pattern. Options 2 through 4 are not without merit, though.
This and the future editing and deleting tutorials will use an ObjectDataSource for retrieving the data to display and direct calls to the BLL to update and delete data option 3. In this tutorial we will create a DataList that lists product information and, for each product, provides the user the ability to edit the name and price and to delete the product altogether. In particular, we will retrieve the records to display using an ObjectDataSource, but perform the update and delete actions by interfacing directly with the BLL.
Before we worry about implementing the editing and deleting capabilities to the DataList, let s first get the page to display the products in a read-only interface.
Since we ve examined these steps in previous tutorials, I'll proceed through them quickly. Start by opening the Basics. Since we are working with product data, configure it to use the ProductsBLL class. As we ve seen in past examples, when completing the ObjectDataSource configuration, Visual Studio automatically creates an ItemTemplate for the DropDownList, displaying each of the data fields.
Replace this ItemTemplate with one that displays only the product s name and price. Also, set the RepeatColumns property to 2. In this tutorial, however, we are using the ObjectDataSource only for retrieving data.
After replacing the default DataList ItemTemplate with a customized one, the declarative markup on your page should look similar to the following:. Take a moment to view our progress through a browser. As Figure 7 shows, the DataList displays the product name and unit price for each product in two columns.
The DataList has a number of properties that are required for the updating and deleting process, and these values are stored in view state.
Therefore, when building a DataList that supports editing or deleting data, it is essential that the DataList s view state be enabled. The astute reader may recall that we were able to disable view state when creating editable GridViews, DetailsViews, and FormViews.
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