Gets or sets the text for the error message displayed in a ValidationSummary control when validation fails.
Public Property ErrorMessage As String
Dim instance As BaseValidator Dim value As String value = instance.ErrorMessage instance.ErrorMessage = value
public string ErrorMessage { get; set; }
public: virtual property String^ ErrorMessage { String^ get () sealed; void set (String^ value) sealed; }
public final function get ErrorMessage () : String public final function set ErrorMessage (value : String)
<asp:BaseValidator ErrorMessage="String" />
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.
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.
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.
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="VB" AutoEventWireup="False" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs) Handles SubmitButton.Click If Page.IsValid Then MessageLabel.Text = "Page submitted successfully." Else MessageLabel.Text = "There is an error on the page." End If End Sub </script> <html > <head runat="server"> <title>Validator Example</title> </head> <body> <form id="form1" 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" runat="server"/> <br /><br /> <asp:label id="MessageLabel" runat="server"/> <br /><br /> <asp:validationsummary id="ErrorSummary" runat="server"/> </form> </body> </html>
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <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 > <head runat="server"> <title>Validator Example</title> </head> <body> <form id="form1" 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>
<%@ Page Language="JScript" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> function Button_Click(sender, e : EventArgs) { if (Page.IsValid) { MessageLabel.Text = "Page submitted successfully."; } else { MessageLabel.Text = "There is an error on the page."; } } </script> <html > <head runat="server"> <title>Validator Example</title> </head> <body> <form id="form1" 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>
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