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BaseValidator.ErrorMessage Property

Gets or sets the text for the error message displayed in a ValidationSummary control when validation fails.

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

[LocalizableAttribute(true)] 
public string ErrorMessage { get; set; }
/** @property */
public final String get_ErrorMessage ()

/** @property */
public final void set_ErrorMessage (String value)

public final function get ErrorMessage () : String

public final function set ErrorMessage (value : String)

Property Value

The error message displayed in a ValidationSummary control when validation fails. The default value is an empty string (""), which indicates that this property is not set.

When using a ValidationSummary control, use the ErrorMessage property to specify the text to display in the ValidationSummary control when validation fails for the current validation control. To specify the text to display in the validation control itself, use the Text property.

NoteNote

If you set the ErrorMessage property without setting the Text property, the value of the ErrorMessage property is also displayed in the validation control.

The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see LocalizableAttribute and ASP.NET Globalization and Localization.

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The following code example demonstrates how to use the ErrorMessage property to specify different messages for the ValidationSummary control and the RequiredFieldValidator and CompareValidator controls.

<%@ Page Language="C#" %>

<script runat="server">
 
  void Button_Click(Object sender, EventArgs e) 
  {
    if (Page.IsValid)
    {
      MessageLabel.Text = "Page submitted successfully.";
    }
    else
    {
      MessageLabel.Text = "There is an error on the page.";
    }
  }
 
</script>

<html>
  <body>
    <form runat="server">

      <h3>Validator Example</h3>
     
      Enter a number from 1 to 10.
      <asp:textbox id="NumberTextBox" 
        runat="server"/>

      <asp:rangevalidator id="NumberCompareValidator" 
        controltovalidate="NumberTextBox"
        enableclientscript="False"  
        type="Integer"
        display="Dynamic" 
        errormessage="Please enter a value from 1 to 10."
        maximumvalue="10"
        minimumvalue="1"  
        text="*"
        runat="server"/>

      <asp:requiredfieldvalidator id="TextBoxRequiredValidator" 
        controltovalidate="NumberTextBox"
        enableclientscript="False"
        display="Dynamic" 
        errormessage="Please enter a value."
        text="*"
        runat="server"/>

      <br><br>

      <asp:button id="SubmitButton"
        text="Submit"
        onclick="Button_Click"
        runat="server"/>
 
      <br><br>
       
      <asp:label id="MessageLabel" 
        runat="server"/>

      <br><br>

      <asp:validationsummary
        id="ErrorSummary"
        runat="server"/>
 
    </form>
  </body>
</html>


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

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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