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Page.RegisterHiddenField Method

NOTE: This method is now obsolete.

Allows server controls to automatically register a hidden field on the form. The field will be sent to the Page object when the HtmlForm server control is rendered.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
[ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202")] 
public virtual void RegisterHiddenField (
	string hiddenFieldName,
	string hiddenFieldInitialValue
)
/** @attribute ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202") */ 
public void RegisterHiddenField (
	String hiddenFieldName, 
	String hiddenFieldInitialValue
)
ObsoleteAttribute("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202") 
public function RegisterHiddenField (
	hiddenFieldName : String, 
	hiddenFieldInitialValue : String
)
Not applicable.

Parameters

hiddenFieldName

The unique name of the hidden field to be rendered.

hiddenFieldInitialValue

The value to be emitted in the hidden form.

The RegisterHiddenField method has been deprecated. Use the RegisterHiddenField method in the ClientScriptManager class.

The following code example uses the RegisterHiddenField method to help create ECMAScript code that is passed to the requesting browser. The name of the hidden field is set to myHiddenField and its value is set to "Welcome to Microsoft!" The RegisterStartupScript method calls the myHiddenField value when the user clicks a button on the page.

Security noteSecurity Note:

This example has a hidden field, which is a potential security threat. By default, you should validate the value of a hidden field as you would the value of a text box. ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio).

void Page_Load(Object sender, EventArgs e) 
{ 
   String scriptString = "<script language=\"JavaScript\"> function doClick() {";
   scriptString += "document.write('<h4>' + myForm.myHiddenField.value+ '</h4>');}<";
   scriptString += "/" + "script>";
      
   RegisterHiddenField("myHiddenField", "Welcome to Microsoft!"); 
   
   RegisterOnSubmitStatement("submit", "document.write('<h4>Submit button clicked.</h4>')"); 
   
   RegisterStartupScript("startup", scriptString);
} 

void Page_Load(Object sender, EventArgs e) 
{ 
    String scriptString 
= "<script language=\"JavaScript\"> function doClick() {";
    scriptString 
+= "document.write('<h4>' + myForm.myHiddenField.value+ '</h4>');}<";
    scriptString += "/" + "script>";
      
    RegisterHiddenField("myHiddenField", "Welcome to Microsoft!"); 
    RegisterOnSubmitStatement("submit", 
"document.write('<h4>Submit button clicked.</h4>')"); 
    RegisterStartupScript("startup", scriptString);
} //Page_Load

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 1.0, 1.1, 2.0
Obsolete (compiler warning) in 3.0
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