Page.RegisterHiddenField(String, String) Method

Reference

Definition

Namespace:: System.Web.UI

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Caution

The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202

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.

public:
 virtual void RegisterHiddenField(System::String ^ hiddenFieldName, System::String ^ hiddenFieldInitialValue);

public virtual void RegisterHiddenField (string hiddenFieldName, string hiddenFieldInitialValue);

[System.Obsolete("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);

abstract member RegisterHiddenField : string * string -> unit
override this.RegisterHiddenField : string * string -> unit

[<System.Obsolete("The recommended alternative is ClientScript.RegisterHiddenField(string hiddenFieldName, string hiddenFieldInitialValue). http://go.microsoft.com/fwlink/?linkid=14202")>]
abstract member RegisterHiddenField : string * string -> unit
override this.RegisterHiddenField : string * string -> unit

Public Overridable Sub RegisterHiddenField (hiddenFieldName As String, hiddenFieldInitialValue As String)

Parameters

hiddenFieldName: String

The unique name of the hidden field to be rendered.

hiddenFieldInitialValue: String

The value to be emitted in the hidden form.

Attributes: ObsoleteAttribute

Examples

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.

Important

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.

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);
}


     Dim scriptString As String = "<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)

Remarks

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

Applies to

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