Gridview is not updating
With a TemplateField, however, you can specify precisely how the editing interface should function. Let's create a GridView that displays fields from the Northwind Products table, just like we did in the previous demo.
This is accomplished by using TemplateFields in place of BoundFields, and specifying the editable interface to be used. Our next task is to customize the editing interface for the CategoryName column so that it uses a DropDownList of categories as opposed to a TextBox.
In addition to deleting a GridView's underlying data, another common need is to allow end users to edit the data displayed in a GridView. This is a prime case where a DropDownList would be suited for the editing interface. Checked Then If importdata. In the last two demos we'll see how to customize the editing interface for a GridView column.
Note that this entire exercise was accomplished without writing a line of code. Our first demo will look at how to create an editable GridView whose data comes from a SqlDataSource. Modifying the editing interface to provide a DropDownList is remarkably easy, requiring no source code at all.
This example demonstrates the GridView's default editing interface, which renders all editable columns as TextBoxes. By default, the TextBoxes have no validation controls associated with them, but your business rules might require certain validation. As you may have guessed, when creating an editable GridView whose data comes from an ObjectDataSource, the underlying data access layer class must provide an appropriate Update method.
You can override this behavior by setting the ConvertEmptyStringToNull property to False for whatever parameters needed. Regardless of how you want to alter the GridView's editing interface, the way it's accomplished is through using TemplateFields as opposed to BoundFields. The GridView allows editing on a row-by-row basis. We recommend using Visual Studio This documentation is archived and is not being maintained. One disadvantage of the default editing capabilities of the GridView, though, is that the editing interface is likely suboptimal.
The GridView's editing interface can be manipulated on a column-by-column level. Looking back at our last two editable GridView examples, consider what would happen if the user entered a value of, say, Sam for the Unit Price of a product. As you can see in the TextBox Web control's declarative syntax, the magic is in the Bind method. All of the necessary functionality is encapsulated within the GridView. In this section we'll examine four examples.
The TextBox present was not added by myself, but placed there automatically when converting to the TemplateField. To help clarify any confusion, let's look at a concrete example.
In this section we'll look at two examples of customizing the GridView's editing interface. If, on the other hand, CompareAllValues is used, the Update method must accept both the updated and original non-primary key field values along with the original primary key field s. Most of the work is required in adding a method to the data access layer class to handle the update. The first step is to transform those three columns into TemplateFields. An editable GridView contains an additional column with an Edit button in each row.
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