Use ValidationSummary to display message box (C#) : ValidationSummary « Validation « ASP.NET Tutorial
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- Validation
- ValidationSummary
File: Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ValidationSummary" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Validation Summary</title>
</head>
<body>
<form id="form1" runat="server">
<div>
A number (1 to 10):
<asp:textbox id="txtValidated" runat="server"></asp:textbox>
<asp:rangevalidator id="RangeValidator"
runat="server"
Type="Integer"
MinimumValue="1"
MaximumValue="10"
ControlToValidate="txtValidated"
Text="<img src='ErrorIcon.jpg' alt='Error' />"
ErrorMessage="The First Number Is Not In The Range">
</asp:rangevalidator>
Not validated:
<asp:textbox id="txtNotValidated" runat="server"></asp:textbox><br/>
<br />
<asp:button id="cmdOK"
runat="server"
Text="OK"
OnClick="cmdOK_Click"
Width="44px"></asp:button><br />
<br />
<asp:label id="lblMessage"
runat="server"
EnableViewState="False"></asp:label><br />
<br />
<asp:ValidationSummary id="ValidationSummary1"
runat="server"
ShowMessageBox="True"></asp:ValidationSummary>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class ValidationSummary : System.Web.UI.Page
{
protected void cmdOK_Click(object sender, EventArgs e)
{
if (!Page.IsValid) return;
lblMessage.Text = "cmdOK_Click event handler executed.";
}
}