Dataset updating database c

Upon completing the wizard, Visual Studio will add Bound Fields to the Details View for the " Delete Command= "DELETE FROM [Products] WHERE [Product ID] = @Product ID" Insert Command= "INSERT INTO [Products] ([Product Name], [Unit Price], [Discontinued]) VALUES (@Product Name, @Unit Price, @Discontinued)" Select Command= "SELECT [Product ID], [Product Name], [Unit Price], [Discontinued] FROM [Products]" Update Command= "UPDATE [Products] SET [Product Name] = @Product Name, [Unit Price] = @Unit Price, [Discontinued] = @Discontinued WHERE [Product ID] = @Product ID".

Visit the page in a browser and note the Edit, Delete, and New buttons included in the Details View.

As discussed in An Overview of Inserting, Updating, and Deleting, the Grid View control provides built-in updating and deleting capabilities, while the Details View and Form View controls include inserting support along with editing and deleting functionality.

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Clicking the Edit button turns the Details View into edit mode, which displays each Bound Field whose (the default) as a Text Box, and the Check Box Field as a checkbox.

Figure 9: The Details View s Default Editing Interface (Click to view full-size image) Similarly, you can delete the currently selected product or add a new product to the system.

From the Designer in Sql Data Source and then bring up the Properties window (from the View menu, choose Properties window, or simply hit F4).

Select the Delete Query property, which will bring up a set of ellipses.

Figure 5: Clicking the Delete Button in the Grid View Invokes the Sql Data Source s SQL statements can be specified through the Properties window or the control s declarative syntax.

However, this approach requires that we manually write out the SQL statements by hand, which can be monotonous and error-prone.

Fortunately, the Configure Data Source wizard provides an option to have the statements checkbox will only be checkable if the table selected has a primary key and the primary key column (or columns) are included in the list of returned columns.

The Use optimistic concurrency checkbox, which becomes selectable once the Generate statements to provide optimistic concurrency control.

Figure 2: Select the Delete Query Property from the Properties Window provide a value for this parameter (leave its Parameter source at None ).

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