SqlDataSource.SelectParameters Property
Assembly: System.Web (in system.web.dll)
/** @property */ public ParameterCollection get_SelectParameters ()
public function get SelectParameters () : ParameterCollection
Not applicable.
Property Value
A ParameterCollection that contains the parameters used by the SelectCommand property.If the SelectCommand property contains a parameterized SQL query, the SelectParameters collection contains any Parameter objects that correspond to the parameter placeholders in the SQL string.
Depending on the ADO.NET provider, the order of the parameters in the SelectParameters collection might be important. The System.Data.OleDb and System.Data.Odbc providers associate the parameters in the collection according to the order that the parameters appear in the parameterized SQL query. The System.Data.SqlClient provider, which is the default ADO.NET provider for the SqlDataSource control, associates the parameters in the collection by matching the name of the parameter with a placeholder alias in the SQL query. For more information on parameterized SQL queries and commands, see Parameters with the SqlDataSource and AccessDataSource Controls.
The SelectParameters property retrieves the SelectParameters property that is contained by the SqlDataSourceView object that is associated with the SqlDataSource control.
 Security Note: |
|---|
| Values are inserted into parameters without validation, which is a potential security threat. Use the Selecting event to validate parameter values before executing the query. For more information, see Script Exploits Overview (Visual Studio). |
The following code example demonstrates how to retrieve data from the Northwind database in Microsoft SQL Server by setting the SelectCommand property to an SQL query. The SQL query is parameterized and the placeholder in the SelectCommand property is matched to the ControlParameter object that is added to the SelectParameters collection. The DropDownList control, which the ControlParameter is bound to, acts as a filter for what is displayed in the ListBox control.
| Note: |
|---|
| Because the parameter is used in a WHERE clause, the use of the SelectParameters property in the code example is functionally equivalent to using the FilterExpression and FilterParameters properties. |
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<p><asp:DropDownList
id="DropDownList1"
runat="server"
AutoPostBack="True">
<asp:ListItem Selected="True">Sales Representative</asp:ListItem>
<asp:ListItem>Sales Manager</asp:ListItem>
<asp:ListItem>Vice President, Sales</asp:ListItem>
</asp:DropDownList></p>
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
ConnectionString="Data Source=localhost;Integrated Security=SSPI;Initial Catalog=Northwind;"
SelectCommand="SELECT LastName FROM Employees WHERE Title = @Title">
<SelectParameters>
<asp:ControlParameter Name="Title" ControlId="DropDownList1" PropertyName="SelectedValue"/>
</SelectParameters>
</asp:SqlDataSource>
<p><asp:ListBox
id="ListBox1"
runat="server"
DataSourceID="SqlDataSource1"
DataTextField="LastName">
</asp:ListBox></p>
</form>
</body>
</html>
