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BaseValidator.EnableClientScript Property

Gets or sets a value indicating whether client-side validation is enabled.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
public bool EnableClientScript { get; set; }
<asp:BaseValidator EnableClientScript="True|False" />

Property Value

Type: System.Boolean
true if client-side validation is enabled; otherwise, false. The default value is true.

Use the EnableClientScript property to specify whether client-side validation is enabled.

Validation controls always perform validation on the server. They also have complete client-side implementation that allows DHTML-supported browsers (such as Microsoft Internet Explorer 4.0 and later) to perform validation on the client. Client-side validation enhances the validation process by checking user input before it is sent to the server. This allows errors to be detected on the client before the form is submitted, avoiding the round trip of information necessary for server-side validation.

By default, this value is set to true, which enables client-side validation if the browser supports it. You can disable client-side validation on a control-by-control basis. This is useful if dynamic updating on the client creates problems with the layout of the page, or if you want to execute some server code before validation takes place.

This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins.

Walkthrough: Validating User Input in a Web Forms PageBuilding ASP .NET Web Applications in Visual Studio

The following code example demonstrates how to use the EnableClientScript property to disable client-side validation so that the random numbers can be generated on the server.

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="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<script runat="server">

  void Button_Click(Object sender, EventArgs e) 
    if (Page.IsValid)
      MessageLabel.Text = "Page submitted successfully.";
      MessageLabel.Text = "There is an error on the page.";


<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>Validator Example</title>
    <form id="form1" runat="server">

      <h3>Validator Example</h3>

      Enter a number from 1 to 10.
      <asp:textbox id="NumberTextBox" 

      <asp:rangevalidator id="NumberCompareValidator" 
        errormessage="Please enter a value from 1 to 10."

      <asp:requiredfieldvalidator id="TextBoxRequiredValidator" 
        errormessage="Please enter a value."

      <br /><br />

      <asp:button id="SubmitButton"

      <br /><br />

      <asp:label id="MessageLabel" 

      <br /><br />



.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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