Gets the data key value of the current record in a FormView control.
(in System.Web.dll)
Visual Basic (Declaration)
<BrowsableAttribute(False)> _
Public ReadOnly Property SelectedValue As Object
Dim instance As FormView
Dim value As Object
value = instance.SelectedValue
[BrowsableAttribute(false)]
public Object SelectedValue { get; }
[BrowsableAttribute(false)]
public:
property Object^ SelectedValue {
Object^ get ();
}
public function get SelectedValue () : Object
When the DataKeyNames property is set, the FormView control automatically creates a DataKey object that contains the key/value pairs of the field or fields listed in the DataKeyNames property for the current record. The DataKey object represents the primary key field or fields for the current record and is stored in the DataKey property. Instead of using the DataKey property to access the data key value, you can use the SelectedValue property as a shortcut.
.gif) Note: |
|---|
When the DataKeyNames property lists multiple fields, this property returns the value of the first field listed. |
The following example demonstrates how to use the SelectedValue property to determine the value of the key field.
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub EmployeeFormView_ItemCreated(ByVal sender As Object, ByVal e As EventArgs)
MessageLabel.Text = "The key value is " & EmployeeFormView.SelectedValue.ToString() & "."
End Sub
</script>
<html >
<head runat="server">
<title>FormView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView SelectedValue Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
runat="server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void EmployeeFormView_ItemCreated(Object sender, EventArgs e)
{
MessageLabel.Text = "The key value is " + EmployeeFormView.SelectedValue.ToString() + ".";
}
</script>
<html >
<head runat="server">
<title>FormView SelectedValue Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormView SelectedValue Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
onitemcreated="EmployeeFormView_ItemCreated"
runat="server">
<itemtemplate>
<table>
<tr>
<td>
<asp:image id="EmployeeImage"
imageurl='<%# Eval("PhotoPath") %>'
alternatetext='<%# Eval("LastName") %>'
runat="server"/>
</td>
<td>
<h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>
<%# Eval("Title") %>
</td>
</tr>
</table>
</itemtemplate>
</asp:formview>
<br/><br/>
<asp:label id="MessageLabel"
forecolor="Red"
runat="server"/>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0
Reference