Validation ASP.Net Tutorial

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"  Inherits="Login" %>



    Simple Login Page


    
    

        
        
          Username:
          
                        runat="server"
              ControlToValidate="usernameTextBox"
              ErrorMessage="Username is required!"
              SetFocusOnError="True" />
        
        
        
          Password and Confirmation:
                        TextMode="Password" />
                        runat="server"
              ControlToValidate="passwordTextBox"
              ErrorMessage="Password is required!"
              SetFocusOnError="True" 
              Display="Dynamic" />
                                 runat="server"
                       TextMode="Password" />
                        runat="server" 
              ControlToValidate="confirmPasswordTextBox"
              ErrorMessage="Password confirmation is required!"
              SetFocusOnError="True" 
              Display="Dynamic" />
                        ControlToCompare="passwordTextBox"
              ControlToValidate="confirmPasswordTextBox"
              ErrorMessage="Your passwords do not match up!"
              Display="Dynamic" />
        
        
        
          Birth Date:
          
                        Type="Date" ControlToValidate="birthDateTextBox" 
              MinimumValue="1/1/1970" 
              MaximumValue="12/31/1979"
              ErrorMessage="You must've been born in the 1970s!" />
        
        
        
                        Text="Submit" OnClick="submitButton_Click" />
        
    

    


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 Login : System.Web.UI.Page
{
    protected void submitButton_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            submitButton.Text = "Valid";
        }
        else
        {
            submitButton.Text = "Invalid!";
        }
    }
}