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RequiredFieldValidator Class

Makes the associated input control a required field.

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

public class RequiredFieldValidator : BaseValidator
public class RequiredFieldValidator extends BaseValidator
public class RequiredFieldValidator extends BaseValidator
Not applicable.

Use this control to make an input control a required field. The input control fails validation if its value does not change from the InitialValue property upon losing focus.

Multiple validators can be associated with the same input control. For example, a RequiredFieldValidator can be used to ensure input to a control, while at the same time a RangeValidator can be used to ensure that the input is within a specified data range.

For additional information on validation controls, see BaseValidator.

Accessibility

The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.

TopicLocation
How to: Validate Against Values in a Database for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Range of Values for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Specific Value for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Data Type for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Specify Layout for In-Place Messages On ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Required Entries for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Display Server Side Custom Validation Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Test Validity Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Patterns for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Format Validation Error Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate with a Custom Function for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Disable Validation for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Values in a Database for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Range of Values for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Specific Value for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against a Data Type for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Specify Layout for In-Place Messages On ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Required Entries for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Display Server Side Custom Validation Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Test Validity Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Against Patterns for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate Programmatically for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Format Validation Error Messages for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Validate with a Custom Function for ASP.NET Server ControlsBuilding ASP .NET Web Applications
How to: Disable Validation for ASP.NET Server ControlsBuilding ASP .NET Web Applications
Walkthrough: Validating User Input in a Web Forms PageBuilding ASP .NET Web Applications in Visual Studio
How to: Validate Against Values in a Database for ASP.NET Server Controls

The following example demonstrates how to use the RequiredFieldValidator control to make sure that the user enters a value into the text box.

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 (Visual Studio).

<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>RequiredField Validator Example</title>
<script runat="server">
 
      void ValidateBtn_Click(Object sender, EventArgs e) 
      {
 
         if (Page.IsValid) 
         {
            lblOutput.Text = "Required field is filled!";
         }
         else 
         {
            lblOutput.Text = "Required field is empty!";
         }
      }
 
   </script>
 
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>RequiredField Validator Example</h3>
 
      <table style="background-color:#eeeeee; padding:10">
         <tr valign="top">
            <td colspan="3">
               <asp:Label ID="lblOutput" 
                    Text="Fill in the required field below"
                    runat="server"
                    AssociatedControlID="TextBox1"/>
               <br />
            </td>
         </tr>
 
         <tr>
            <td colspan="3">
               <b>Credit Card Information</b>
            </td>
         </tr>
     
         <tr>
            <td align="right">
               Card Number:
            </td>
            <td>
               <asp:TextBox id="TextBox1" 
                    runat="server"/>
            </td>
            <td>
               <asp:RequiredFieldValidator id="RequiredFieldValidator2"
                    ControlToValidate="TextBox1"
                    Display="Static"
                    ErrorMessage="*"
                    runat="server"/> 
            </td>
         </tr>
         <tr>
            <td></td>
            <td>
               <asp:Button id="Button1" 
                    Text="Validate" 
                    OnClick="ValidateBtn_Click" 
                    runat="server"/>
            </td>
            <td></td>
         </tr>
      </table>
 
   </form>
 
</body>
</html>
    


<html>
<head>
   <script language="C#" runat=server>

      void ValidateBtn_Click(Object sender, EventArgs e) {

         if (Page.IsValid == true) {
            lblOutput.Text = "Required field is filled!";
         }
         else {
            lblOutput.Text = "Required field is empty!";
         }
      }

   </script>

</head>
<body>

<h3><font face="Verdana">RequiredField Validator Sample</font></h3>
<p>

<form runat="server">

   <table bgcolor="#eeeeee" cellpadding=10>
      <tr valign="top">
         <td colspan=3>
            <asp:Label ID="lblOutput" 
                 Text="Fill in the required field below"
                 ForeColor="red" 
                 Font-Name="Verdana" 
                 Font-Size="10" runat=server /><br>
         </td>
      </tr>

      <tr>
         <td colspan=3>
            <font face=Verdana size=2><b>Credit Card Information</b></font>
         </td>
      </tr>
    
      <tr>
         <td align=right>
            <font face=Verdana size=2>Card Number:</font>
         </td>
         <td>
            <asp:TextBox id=TextBox1 runat=server />
         </td>
         <td>
            <asp:RequiredFieldValidator id="RequiredFieldValidator2"
                 ControlToValidate="TextBox1"
                 Display="Static"
                 Width="100%" runat=server>
                 *
            </asp:RequiredFieldValidator>

         </td>
      </tr>
      <tr>
         <td></td>
         <td>
            <asp:Button id=Button1 
                 text="Validate" 
                 OnClick="ValidateBtn_Click" 
                 runat=server />
         </td>
         <td></td>
      </tr>
   </table>

</form>

</body>
</html>
   

System.Object
   System.Web.UI.Control
     System.Web.UI.WebControls.WebControl
       System.Web.UI.WebControls.Label
         System.Web.UI.WebControls.BaseValidator
          System.Web.UI.WebControls.RequiredFieldValidator

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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: 3.0, 2.0, 1.1, 1.0

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