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ControlParameter Constructor

Initializes a new unnamed instance of the ControlParameter class.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public ControlParameter()

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>


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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