ControlParameter Constructor
Initializes a new unnamed instance of the ControlParameter class.
Assembly: System.Web (in System.Web.dll)
A ControlParameter object that is created with the ControlParameter constructor is initialized with default values for all its properties. The ControlID and PropertyName properties are initialized to String.Empty. In addition, the Name property is initialized to String.Empty, the Type property is initialized to TypeCode.Object, the Direction property is initialized to Input, and the DefaultValue property is initialized to null.
The following code shows how to create a ControlParameter object with the ControlParameter constructor. The ControlParameter object binds the SelectedValue property of a DropDownList control to a parameterized SQL query that retrieves data that is displayed in a DataGrid control.
<%@ Page Language="C#" CodeFile="param1acs.aspx.cs" Inherits="param1acs_aspx" %> <!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"> <div> <asp:DropDownList runat="server" AutoPostBack="True" id="DropDownList1"> <asp:ListItem Value="USA">USA</asp:ListItem> <asp:ListItem Value="UK">UK</asp:ListItem> </asp:DropDownList> <asp:DataGrid runat="server" id="DataGrid1" /> </div> </form> </body> </html>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
