How to: Add a Parameterized Query to a Windows Forms Application
Adding search functionality to a form in a Windows application can be accomplished by running a parameterized query. A parameterized query returns data that meets the conditions of a WHERE clause. You add parameterization to a query by completing the Search Criteria Builder Dialog Box. For example, you can parameterize a query to display only customers in a certain city by adding WHERE City = @City to the end of the SQL statement that returns a list of customers. For more information, see Parameter Queries.
Completing the Search Criteria Dialog Box does the following:
The query is added to the associated TableAdapter.
Controls are added to the form for users to provide any required parameter values, and a button is added to execute the query.
Code is added to the button's click event that sets parameter values and executes the query.
Note
Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. The Visual Studio edition that you have and the settings that you use determine these elements. For more information, see Visual Studio Settings.
To add a query to an existing data-bound form
Open the form in the Windows Forms Designer.
Click Add Query on the Data menu or Data Smart Tags.
Note
If Add Query is not available on the Data menu, select a control on the form that displays the data source you want to add the parameterization to. For example, if the form displays data in a DataGridView control, select it. If the form displays data in individual controls, select any data-bound control.
Select the desired table to add parameterization in the Select data source table area. For more information, see Search Criteria Builder Dialog Box.
Type a name in the New query name box if you are creating a new query.
-or-
Select a query in the Existing query name box.
Type a query that takes parameters in the Query Text box.
Tip
Use the Query Builder to assist in creating a query. For more information, see Query and View Designer Tools.
Click OK.
A control to input the parameter and a Load button are added to the form in a ToolStrip control.
See Also
Tasks
Walkthrough: Creating a Windows Form to Search Data
Walkthrough: Displaying Data on a Windows Form
How to: Connect to Data in a Database
How to: Navigate Data with the Windows Forms BindingNavigator Control
How to: Sort and Filter ADO.NET Data with the Windows Forms BindingSource Component
How to: Create a Lookup Table with the Windows Forms BindingSource Component