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HiddenField.Value Property

Gets or sets the value of the hidden field.

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

'Declaration
<BindableAttribute(True)> _
Public Overridable Property Value As String
'Usage
Dim instance As HiddenField 
Dim value As String 

value = instance.Value

instance.Value = value
<asp:HiddenField Value="String" />

Property Value

Type: System.String
The value of the hidden field. The default is an empty string ("").

Use the Value property to specify or determine the value of the HiddenField control.

The following example demonstrates how to use the Value property to specify the value of the HiddenField control.

Security noteSecurity Note:

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ 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 ValueHiddenField_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)

    ' Display the value of the HiddenField control.
    Message.Text = "The value of the HiddenField control is " & ValueHiddenField.Value & "." 

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
    <title>HiddenField Example</title>
</head>
<body>
        <form id="Form1" runat="server">

            <h3>HiddenField Example</h3>

            Please enter a value and click the submit button.<br/>

            <asp:textbox id="ValueTextBox"
              runat="server"/>

            <br/>  

            <input type="submit" name="SubmitButton"
             value="Submit"
             onclick="PageLoad()" />

            <br/>

            <asp:label id="Message" runat="server"/>    

            <asp:hiddenfield id="ValueHiddenField"
              onvaluechanged="ValueHiddenField_ValueChanged"
              value="" 
              runat="server"/>

        </form>
    </body>
</html>

<script type="text/javascript">

  <!--
  function PageLoad()
  {

    // Set the value of the HiddenField control with the
    // value from the TextBox.
    Form1.ValueHiddenField.value = Form1.ValueTextBox.value;

  }
  -->

</script>

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

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